Index: frontend/node_modules/commander/LICENSE
===================================================================
--- frontend/node_modules/commander/LICENSE	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/LICENSE	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) 2011 TJ Holowaychuk <tj@vision-media.ca>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Index: frontend/node_modules/commander/Readme.md
===================================================================
--- frontend/node_modules/commander/Readme.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/Readme.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1015 @@
+# Commander.js
+
+[![Build Status](https://github.com/tj/commander.js/workflows/build/badge.svg)](https://github.com/tj/commander.js/actions?query=workflow%3A%22build%22)
+[![NPM Version](http://img.shields.io/npm/v/commander.svg?style=flat)](https://www.npmjs.org/package/commander)
+[![NPM Downloads](https://img.shields.io/npm/dm/commander.svg?style=flat)](https://npmcharts.com/compare/commander?minimal=true)
+[![Install Size](https://packagephobia.now.sh/badge?p=commander)](https://packagephobia.now.sh/result?p=commander)
+
+The complete solution for [node.js](http://nodejs.org) command-line interfaces.
+
+Read this in other languages: English | [简体中文](./Readme_zh-CN.md)
+
+- [Commander.js](#commanderjs)
+  - [Installation](#installation)
+  - [Declaring _program_ variable](#declaring-program-variable)
+  - [Options](#options)
+    - [Common option types, boolean and value](#common-option-types-boolean-and-value)
+    - [Default option value](#default-option-value)
+    - [Other option types, negatable boolean and boolean|value](#other-option-types-negatable-boolean-and-booleanvalue)
+    - [Required option](#required-option)
+    - [Variadic option](#variadic-option)
+    - [Version option](#version-option)
+    - [More configuration](#more-configuration)
+    - [Custom option processing](#custom-option-processing)
+  - [Commands](#commands)
+    - [Command-arguments](#command-arguments)
+      - [More configuration](#more-configuration-1)
+      - [Custom argument processing](#custom-argument-processing)
+    - [Action handler](#action-handler)
+    - [Stand-alone executable (sub)commands](#stand-alone-executable-subcommands)
+    - [Life cycle hooks](#life-cycle-hooks)
+  - [Automated help](#automated-help)
+    - [Custom help](#custom-help)
+    - [Display help after errors](#display-help-after-errors)
+    - [Display help from code](#display-help-from-code)
+    - [.usage and .name](#usage-and-name)
+    - [.helpOption(flags, description)](#helpoptionflags-description)
+    - [.addHelpCommand()](#addhelpcommand)
+    - [More configuration](#more-configuration-2)
+  - [Custom event listeners](#custom-event-listeners)
+  - [Bits and pieces](#bits-and-pieces)
+    - [.parse() and .parseAsync()](#parse-and-parseasync)
+    - [Parsing Configuration](#parsing-configuration)
+    - [Legacy options as properties](#legacy-options-as-properties)
+    - [TypeScript](#typescript)
+    - [createCommand()](#createcommand)
+    - [Node options such as `--harmony`](#node-options-such-as---harmony)
+    - [Debugging stand-alone executable subcommands](#debugging-stand-alone-executable-subcommands)
+    - [Override exit and output handling](#override-exit-and-output-handling)
+    - [Additional documentation](#additional-documentation)
+  - [Examples](#examples)
+  - [Support](#support)
+    - [Commander for enterprise](#commander-for-enterprise)
+
+For information about terms used in this document see: [terminology](./docs/terminology.md)
+
+## Installation
+
+```bash
+npm install commander
+```
+
+## Declaring _program_ variable
+
+Commander exports a global object which is convenient for quick programs.
+This is used in the examples in this README for brevity.
+
+```js
+const { program } = require('commander');
+program.version('0.0.1');
+```
+
+For larger programs which may use commander in multiple ways, including unit testing, it is better to create a local Command object to use.
+
+```js
+const { Command } = require('commander');
+const program = new Command();
+program.version('0.0.1');
+```
+
+For named imports in ECMAScript modules, import from `commander/esm.mjs`.
+
+```js
+// index.mjs
+import { Command } from 'commander/esm.mjs';
+const program = new Command();
+```
+
+And in TypeScript:
+
+```ts
+// index.ts
+import { Command } from 'commander';
+const program = new Command();
+```
+
+## Options
+
+Options are defined with the `.option()` method, also serving as documentation for the options. Each option can have a short flag (single character) and a long name, separated by a comma or space or vertical bar ('|').
+
+The parsed options can be accessed by calling `.opts()` on a `Command` object, and are passed to the action handler.
+(You can also use `.getOptionValue()` and `.setOptionValue()` to work with a single option value,
+and `.getOptionValueSource()` and `.setOptionValueWithSource()` when it matters where the option value came from.)
+
+Multi-word options such as "--template-engine" are camel-cased, becoming `program.opts().templateEngine` etc.
+
+Multiple short flags may optionally be combined in a single argument following the dash: boolean flags, followed by a single option taking a value (possibly followed by the value).
+For example `-a -b -p 80` may be written as `-ab -p80` or even `-abp80`.
+
+You can use `--` to indicate the end of the options, and any remaining arguments will be used without being interpreted.
+
+By default options on the command line are not positional, and can be specified before or after other arguments.
+
+### Common option types, boolean and value
+
+The two most used option types are a boolean option, and an option which takes its value
+from the following argument (declared with angle brackets like `--expect <value>`). Both are `undefined` unless specified on command line.
+
+Example file: [options-common.js](./examples/options-common.js)
+
+```js
+program
+  .option('-d, --debug', 'output extra debugging')
+  .option('-s, --small', 'small pizza size')
+  .option('-p, --pizza-type <type>', 'flavour of pizza');
+
+program.parse(process.argv);
+
+const options = program.opts();
+if (options.debug) console.log(options);
+console.log('pizza details:');
+if (options.small) console.log('- small pizza size');
+if (options.pizzaType) console.log(`- ${options.pizzaType}`);
+```
+
+```bash
+$ pizza-options -p
+error: option '-p, --pizza-type <type>' argument missing
+$ pizza-options -d -s -p vegetarian
+{ debug: true, small: true, pizzaType: 'vegetarian' }
+pizza details:
+- small pizza size
+- vegetarian
+$ pizza-options --pizza-type=cheese
+pizza details:
+- cheese
+```
+
+`program.parse(arguments)` processes the arguments, leaving any args not consumed by the program options in the `program.args` array. The parameter is optional and defaults to `process.argv`.
+
+### Default option value
+
+You can specify a default value for an option which takes a value.
+
+Example file: [options-defaults.js](./examples/options-defaults.js)
+
+```js
+program
+  .option('-c, --cheese <type>', 'add the specified type of cheese', 'blue');
+
+program.parse();
+
+console.log(`cheese: ${program.opts().cheese}`);
+```
+
+```bash
+$ pizza-options
+cheese: blue
+$ pizza-options --cheese stilton
+cheese: stilton
+```
+
+### Other option types, negatable boolean and boolean|value
+
+You can define a boolean option long name with a leading `no-` to set the option value to false when used.
+Defined alone this also makes the option true by default.
+
+If you define `--foo` first, adding `--no-foo` does not change the default value from what it would
+otherwise be. You can specify a default boolean value for a boolean option and it can be overridden on command line.
+
+Example file: [options-negatable.js](./examples/options-negatable.js)
+
+```js
+program
+  .option('--no-sauce', 'Remove sauce')
+  .option('--cheese <flavour>', 'cheese flavour', 'mozzarella')
+  .option('--no-cheese', 'plain with no cheese')
+  .parse();
+
+const options = program.opts();
+const sauceStr = options.sauce ? 'sauce' : 'no sauce';
+const cheeseStr = (options.cheese === false) ? 'no cheese' : `${options.cheese} cheese`;
+console.log(`You ordered a pizza with ${sauceStr} and ${cheeseStr}`);
+```
+
+```bash
+$ pizza-options
+You ordered a pizza with sauce and mozzarella cheese
+$ pizza-options --sauce
+error: unknown option '--sauce'
+$ pizza-options --cheese=blue
+You ordered a pizza with sauce and blue cheese
+$ pizza-options --no-sauce --no-cheese
+You ordered a pizza with no sauce and no cheese
+```
+
+You can specify an option which may be used as a boolean option but may optionally take an option-argument
+(declared with square brackets like `--optional [value]`).
+
+Example file: [options-boolean-or-value.js](./examples/options-boolean-or-value.js)
+
+```js
+program
+  .option('-c, --cheese [type]', 'Add cheese with optional type');
+
+program.parse(process.argv);
+
+const options = program.opts();
+if (options.cheese === undefined) console.log('no cheese');
+else if (options.cheese === true) console.log('add cheese');
+else console.log(`add cheese type ${options.cheese}`);
+```
+
+```bash
+$ pizza-options
+no cheese
+$ pizza-options --cheese
+add cheese
+$ pizza-options --cheese mozzarella
+add cheese type mozzarella
+```
+
+For information about possible ambiguous cases, see [options taking varying arguments](./docs/options-taking-varying-arguments.md).
+
+### Required option
+
+You may specify a required (mandatory) option using `.requiredOption`. The option must have a value after parsing, usually specified on the command line, or perhaps from a default value (say from environment). The method is otherwise the same as `.option` in format, taking flags and description, and optional default value or custom processing.
+
+Example file: [options-required.js](./examples/options-required.js)
+
+```js
+program
+  .requiredOption('-c, --cheese <type>', 'pizza must have cheese');
+
+program.parse();
+```
+
+```bash
+$ pizza
+error: required option '-c, --cheese <type>' not specified
+```
+
+### Variadic option
+
+You may make an option variadic by appending `...` to the value placeholder when declaring the option. On the command line you
+can then specify multiple option-arguments, and the parsed option value will be an array. The extra arguments
+are read until the first argument starting with a dash. The special argument `--` stops option processing entirely. If a value
+is specified in the same argument as the option then no further values are read.
+
+Example file: [options-variadic.js](./examples/options-variadic.js)
+
+```js
+program
+  .option('-n, --number <numbers...>', 'specify numbers')
+  .option('-l, --letter [letters...]', 'specify letters');
+
+program.parse();
+
+console.log('Options: ', program.opts());
+console.log('Remaining arguments: ', program.args);
+```
+
+```bash
+$ collect -n 1 2 3 --letter a b c
+Options:  { number: [ '1', '2', '3' ], letter: [ 'a', 'b', 'c' ] }
+Remaining arguments:  []
+$ collect --letter=A -n80 operand
+Options:  { number: [ '80' ], letter: [ 'A' ] }
+Remaining arguments:  [ 'operand' ]
+$ collect --letter -n 1 -n 2 3 -- operand
+Options:  { number: [ '1', '2', '3' ], letter: true }
+Remaining arguments:  [ 'operand' ]
+```
+
+For information about possible ambiguous cases, see [options taking varying arguments](./docs/options-taking-varying-arguments.md).
+
+### Version option
+
+The optional `version` method adds handling for displaying the command version. The default option flags are `-V` and `--version`, and when present the command prints the version number and exits.
+
+```js
+program.version('0.0.1');
+```
+
+```bash
+$ ./examples/pizza -V
+0.0.1
+```
+
+You may change the flags and description by passing additional parameters to the `version` method, using
+the same syntax for flags as the `option` method.
+
+```js
+program.version('0.0.1', '-v, --vers', 'output the current version');
+```
+
+### More configuration
+
+You can add most options using the `.option()` method, but there are some additional features available
+by constructing an `Option` explicitly for less common cases.
+
+Example files: [options-extra.js](./examples/options-extra.js), [options-env.js](./examples/options-env.js)
+
+```js
+program
+  .addOption(new Option('-s, --secret').hideHelp())
+  .addOption(new Option('-t, --timeout <delay>', 'timeout in seconds').default(60, 'one minute'))
+  .addOption(new Option('-d, --drink <size>', 'drink size').choices(['small', 'medium', 'large']))
+  .addOption(new Option('-p, --port <number>', 'port number').env('PORT'));
+```
+
+```bash
+$ extra --help
+Usage: help [options]
+
+Options:
+  -t, --timeout <delay>  timeout in seconds (default: one minute)
+  -d, --drink <size>     drink cup size (choices: "small", "medium", "large")
+  -p, --port <number>    port number (env: PORT)
+  -h, --help             display help for command
+
+$ extra --drink huge
+error: option '-d, --drink <size>' argument 'huge' is invalid. Allowed choices are small, medium, large.
+
+$ PORT=80 extra 
+Options:  { timeout: 60, port: '80' }
+```
+
+### Custom option processing
+
+You may specify a function to do custom processing of option-arguments. The callback function receives two parameters,
+the user specified option-argument and the previous value for the option. It returns the new value for the option.
+
+This allows you to coerce the option-argument to the desired type, or accumulate values, or do entirely custom processing.
+
+You can optionally specify the default/starting value for the option after the function parameter.
+
+Example file: [options-custom-processing.js](./examples/options-custom-processing.js)
+
+```js
+function myParseInt(value, dummyPrevious) {
+  // parseInt takes a string and a radix
+  const parsedValue = parseInt(value, 10);
+  if (isNaN(parsedValue)) {
+    throw new commander.InvalidArgumentError('Not a number.');
+  }
+  return parsedValue;
+}
+
+function increaseVerbosity(dummyValue, previous) {
+  return previous + 1;
+}
+
+function collect(value, previous) {
+  return previous.concat([value]);
+}
+
+function commaSeparatedList(value, dummyPrevious) {
+  return value.split(',');
+}
+
+program
+  .option('-f, --float <number>', 'float argument', parseFloat)
+  .option('-i, --integer <number>', 'integer argument', myParseInt)
+  .option('-v, --verbose', 'verbosity that can be increased', increaseVerbosity, 0)
+  .option('-c, --collect <value>', 'repeatable value', collect, [])
+  .option('-l, --list <items>', 'comma separated list', commaSeparatedList)
+;
+
+program.parse();
+
+const options = program.opts();
+if (options.float !== undefined) console.log(`float: ${options.float}`);
+if (options.integer !== undefined) console.log(`integer: ${options.integer}`);
+if (options.verbose > 0) console.log(`verbosity: ${options.verbose}`);
+if (options.collect.length > 0) console.log(options.collect);
+if (options.list !== undefined) console.log(options.list);
+```
+
+```bash
+$ custom -f 1e2
+float: 100
+$ custom --integer 2
+integer: 2
+$ custom -v -v -v
+verbose: 3
+$ custom -c a -c b -c c
+[ 'a', 'b', 'c' ]
+$ custom --list x,y,z
+[ 'x', 'y', 'z' ]
+```
+
+## Commands
+
+You can specify (sub)commands using `.command()` or `.addCommand()`. There are two ways these can be implemented: using an action handler attached to the command, or as a stand-alone executable file (described in more detail later). The subcommands may be nested ([example](./examples/nestedCommands.js)).
+
+In the first parameter to `.command()` you specify the command name. You may append the command-arguments after the command name, or specify them separately using `.argument()`. The arguments may be `<required>` or `[optional]`, and the last argument may also be `variadic...`.
+
+You can use `.addCommand()` to add an already configured subcommand to the program.
+
+For example:
+
+```js
+// Command implemented using action handler (description is supplied separately to `.command`)
+// Returns new command for configuring.
+program
+  .command('clone <source> [destination]')
+  .description('clone a repository into a newly created directory')
+  .action((source, destination) => {
+    console.log('clone command called');
+  });
+
+// Command implemented using stand-alone executable file, indicated by adding description as second parameter to `.command`.
+// Returns `this` for adding more commands.
+program
+  .command('start <service>', 'start named service')
+  .command('stop [service]', 'stop named service, or all if no name supplied');
+
+// Command prepared separately.
+// Returns `this` for adding more commands.
+program
+  .addCommand(build.makeBuildCommand());
+```
+
+Configuration options can be passed with the call to `.command()` and `.addCommand()`. Specifying `hidden: true` will
+remove the command from the generated help output. Specifying `isDefault: true` will run the subcommand if no other
+subcommand is specified ([example](./examples/defaultCommand.js)).
+
+### Command-arguments
+
+For subcommands, you can specify the argument syntax in the call to `.command()` (as shown above). This
+is the only method usable for subcommands implemented using a stand-alone executable, but for other subcommands
+you can instead use the following method.
+
+To configure a command, you can use `.argument()` to specify each expected command-argument.
+You supply the argument name and an optional description. The argument may be `<required>` or `[optional]`.
+You can specify a default value for an optional command-argument.
+
+Example file: [argument.js](./examples/argument.js)
+
+```js
+program
+  .version('0.1.0')
+  .argument('<username>', 'user to login')
+  .argument('[password]', 'password for user, if required', 'no password given')
+  .action((username, password) => {
+    console.log('username:', username);
+    console.log('password:', password);
+  });
+```
+
+ The last argument of a command can be variadic, and only the last argument.  To make an argument variadic you
+ append `...` to the argument name. A variadic argument is passed to the action handler as an array. For example:
+
+```js
+program
+  .version('0.1.0')
+  .command('rmdir')
+  .argument('<dirs...>')
+  .action(function (dirs) {
+    dirs.forEach((dir) => {
+      console.log('rmdir %s', dir);
+    });
+  });
+```
+
+There is a convenience method to add multiple arguments at once, but without descriptions:
+
+```js
+program
+  .arguments('<username> <password>');
+```
+
+#### More configuration
+
+There are some additional features available by constructing an `Argument` explicitly for less common cases.
+
+Example file: [arguments-extra.js](./examples/arguments-extra.js)
+
+```js
+program
+  .addArgument(new commander.Argument('<drink-size>', 'drink cup size').choices(['small', 'medium', 'large']))
+  .addArgument(new commander.Argument('[timeout]', 'timeout in seconds').default(60, 'one minute'))
+```
+
+#### Custom argument processing
+
+You may specify a function to do custom processing of command-arguments (like for option-arguments).
+The callback function receives two parameters, the user specified command-argument and the previous value for the argument.
+It returns the new value for the argument.
+
+The processed argument values are passed to the action handler, and saved as `.processedArgs`.
+
+You can optionally specify the default/starting value for the argument after the function parameter.
+
+Example file: [arguments-custom-processing.js](./examples/arguments-custom-processing.js)
+
+```js
+program
+  .command('add')
+  .argument('<first>', 'integer argument', myParseInt)
+  .argument('[second]', 'integer argument', myParseInt, 1000)
+  .action((first, second) => {
+    console.log(`${first} + ${second} = ${first + second}`);
+  })
+;
+```
+
+### Action handler
+
+The action handler gets passed a parameter for each command-argument you declared, and two additional parameters
+which are the parsed options and the command object itself.
+
+Example file: [thank.js](./examples/thank.js)
+
+```js
+program
+  .argument('<name>')
+  .option('-t, --title <honorific>', 'title to use before name')
+  .option('-d, --debug', 'display some debugging')
+  .action((name, options, command) => {
+    if (options.debug) {
+      console.error('Called %s with options %o', command.name(), options);
+    }
+    const title = options.title ? `${options.title} ` : '';
+    console.log(`Thank-you ${title}${name}`);
+  });
+```
+
+You may supply an `async` action handler, in which case you call `.parseAsync` rather than `.parse`.
+
+```js
+async function run() { /* code goes here */ }
+
+async function main() {
+  program
+    .command('run')
+    .action(run);
+  await program.parseAsync(process.argv);
+}
+```
+
+A command's options and arguments on the command line are validated when the command is used. Any unknown options or missing arguments will be reported as an error. You can suppress the unknown option checks with `.allowUnknownOption()`. By default it is not an error to
+pass more arguments than declared, but you can make this an error with `.allowExcessArguments(false)`.
+
+### Stand-alone executable (sub)commands
+
+When `.command()` is invoked with a description argument, this tells Commander that you're going to use stand-alone executables for subcommands.
+Commander will search the executables in the directory of the entry script (like `./examples/pm`) with the name `program-subcommand`, like `pm-install`, `pm-search`.
+You can specify a custom name with the `executableFile` configuration option.
+
+You handle the options for an executable (sub)command in the executable, and don't declare them at the top-level.
+
+Example file: [pm](./examples/pm)
+
+```js
+program
+  .version('0.1.0')
+  .command('install [name]', 'install one or more packages')
+  .command('search [query]', 'search with optional query')
+  .command('update', 'update installed packages', { executableFile: 'myUpdateSubCommand' })
+  .command('list', 'list packages installed', { isDefault: true });
+
+program.parse(process.argv);
+```
+
+If the program is designed to be installed globally, make sure the executables have proper modes, like `755`.
+
+### Life cycle hooks
+
+You can add callback hooks to a command for life cycle events.
+
+Example file: [hook.js](./examples/hook.js)
+
+```js
+program
+  .option('-t, --trace', 'display trace statements for commands')
+  .hook('preAction', (thisCommand, actionCommand) => {
+    if (thisCommand.opts().trace) {
+      console.log(`About to call action handler for subcommand: ${actionCommand.name()}`);
+      console.log('arguments: %O', actionCommand.args);
+      console.log('options: %o', actionCommand.opts());
+    }
+  });
+```
+
+The callback hook can be `async`, in which case you call `.parseAsync` rather than `.parse`. You can add multiple hooks per event.
+
+The supported events are:
+
+- `preAction`: called before action handler for this command and its subcommands
+- `postAction`: called after action handler for this command and its subcommands
+
+The hook is passed the command it was added to, and the command running the action handler.
+
+## Automated help
+
+The help information is auto-generated based on the information commander already knows about your program. The default
+help option is `-h,--help`.
+
+Example file: [pizza](./examples/pizza)
+
+```bash
+$ node ./examples/pizza --help
+Usage: pizza [options]
+
+An application for pizza ordering
+
+Options:
+  -p, --peppers        Add peppers
+  -c, --cheese <type>  Add the specified type of cheese (default: "marble")
+  -C, --no-cheese      You do not want any cheese
+  -h, --help           display help for command
+```
+
+A `help` command is added by default if your command has subcommands. It can be used alone, or with a subcommand name to show
+further help for the subcommand. These are effectively the same if the `shell` program has implicit help:
+
+```bash
+shell help
+shell --help
+
+shell help spawn
+shell spawn --help
+```
+
+### Custom help
+
+You can add extra text to be displayed along with the built-in help.
+
+Example file: [custom-help](./examples/custom-help)
+
+```js
+program
+  .option('-f, --foo', 'enable some foo');
+
+program.addHelpText('after', `
+
+Example call:
+  $ custom-help --help`);
+```
+
+Yields the following help output:
+
+```Text
+Usage: custom-help [options]
+
+Options:
+  -f, --foo   enable some foo
+  -h, --help  display help for command
+
+Example call:
+  $ custom-help --help
+```
+
+The positions in order displayed are:
+
+- `beforeAll`: add to the program for a global banner or header
+- `before`: display extra information before built-in help
+- `after`: display extra information after built-in help
+- `afterAll`: add to the program for a global footer (epilog)
+
+The positions "beforeAll" and "afterAll" apply to the command and all its subcommands.
+
+The second parameter can be a string, or a function returning a string. The function is passed a context object for your convenience. The properties are:
+
+- error: a boolean for whether the help is being displayed due to a usage error
+- command: the Command which is displaying the help
+
+### Display help after errors
+
+The default behaviour for usage errors is to just display a short error message.
+You can change the behaviour to show the full help or a custom help message after an error.
+
+```js
+program.showHelpAfterError();
+// or
+program.showHelpAfterError('(add --help for additional information)');
+```
+
+```sh
+$ pizza --unknown
+error: unknown option '--unknown'
+(add --help for additional information)
+```
+
+You can also show suggestions after an error for an unknown command or option.
+
+```js
+program.showSuggestionAfterError();
+```
+
+```sh
+$ pizza --hepl
+error: unknown option '--hepl'
+(Did you mean --help?)
+```
+
+### Display help from code
+
+`.help()`: display help information and exit immediately. You can optionally pass `{ error: true }` to display on stderr and exit with an error status.
+
+`.outputHelp()`: output help information without exiting. You can optionally pass `{ error: true }` to display on stderr.
+
+`.helpInformation()`: get the built-in command help information as a string for processing or displaying yourself.
+
+### .usage and .name
+
+These allow you to customise the usage description in the first line of the help. The name is otherwise
+deduced from the (full) program arguments. Given:
+
+```js
+program
+  .name("my-command")
+  .usage("[global options] command")
+```
+
+The help will start with:
+
+```Text
+Usage: my-command [global options] command
+```
+
+### .helpOption(flags, description)
+
+By default every command has a help option. Override the default help flags and description. Pass false to disable the built-in help option.
+
+```js
+program
+  .helpOption('-e, --HELP', 'read more information');
+```
+
+### .addHelpCommand()
+
+A help command is added by default if your command has subcommands. You can explicitly turn on or off the implicit help command with `.addHelpCommand()` and `.addHelpCommand(false)`.
+
+You can both turn on and customise the help command by supplying the name and description:
+
+```js
+program.addHelpCommand('assist [command]', 'show assistance');
+```
+
+### More configuration
+
+The built-in help is formatted using the Help class.
+You can configure the Help behaviour by modifying data properties and methods using `.configureHelp()`, or by subclassing using `.createHelp()` if you prefer.
+
+The data properties are:
+
+- `helpWidth`: specify the wrap width, useful for unit tests
+- `sortSubcommands`: sort the subcommands alphabetically
+- `sortOptions`: sort the options alphabetically
+
+There are methods getting the visible lists of arguments, options, and subcommands. There are methods for formatting the items in the lists, with each item having a _term_ and _description_. Take a look at `.formatHelp()` to see how they are used.
+
+Example file: [configure-help.js](./examples/configure-help.js)
+
+```js
+program.configureHelp({
+  sortSubcommands: true,
+  subcommandTerm: (cmd) => cmd.name() // Just show the name, instead of short usage.
+});
+```
+
+## Custom event listeners
+
+You can execute custom actions by listening to command and option events.
+
+```js
+program.on('option:verbose', function () {
+  process.env.VERBOSE = this.opts().verbose;
+});
+```
+
+## Bits and pieces
+
+### .parse() and .parseAsync()
+
+The first argument to `.parse` is the array of strings to parse. You may omit the parameter to implicitly use `process.argv`.
+
+If the arguments follow different conventions than node you can pass a `from` option in the second parameter:
+
+- 'node': default, `argv[0]` is the application and `argv[1]` is the script being run, with user parameters after that
+- 'electron': `argv[1]` varies depending on whether the electron application is packaged
+- 'user': all of the arguments from the user
+
+For example:
+
+```js
+program.parse(process.argv); // Explicit, node conventions
+program.parse(); // Implicit, and auto-detect electron
+program.parse(['-f', 'filename'], { from: 'user' });
+```
+
+### Parsing Configuration
+
+If the default parsing does not suit your needs, there are some behaviours to support other usage patterns.
+
+By default program options are recognised before and after subcommands. To only look for program options before subcommands, use `.enablePositionalOptions()`. This lets you use
+an option for a different purpose in subcommands.
+
+Example file: [positional-options.js](./examples/positional-options.js)
+
+With positional options, the `-b` is a program option in the first line and a subcommand option in the second line:
+
+```sh
+program -b subcommand
+program subcommand -b
+```
+
+By default options are recognised before and after command-arguments. To only process options that come
+before the command-arguments, use `.passThroughOptions()`. This lets you pass the  arguments and following options through to another program
+without needing to use `--` to end the option processing.
+To use pass through options in a subcommand, the program needs to enable positional options.
+
+Example file: [pass-through-options.js](./examples/pass-through-options.js)
+
+With pass through options, the `--port=80` is a program option in the first line and passed through as a command-argument in the second line:
+
+```sh
+program --port=80 arg
+program arg --port=80
+```
+
+By default the option processing shows an error for an unknown option. To have an unknown option treated as an ordinary command-argument and continue looking for options, use `.allowUnknownOption()`. This lets you mix known and unknown options.
+
+By default the argument processing does not display an error for more command-arguments than expected.
+To display an error for excess arguments, use`.allowExcessArguments(false)`.
+
+### Legacy options as properties
+
+Before Commander 7, the option values were stored as properties on the command.
+This was convenient to code but the downside was possible clashes with
+existing properties of `Command`. You can revert to the old behaviour to run unmodified legacy code by using `.storeOptionsAsProperties()`.
+
+```js
+program
+  .storeOptionsAsProperties()
+  .option('-d, --debug')
+  .action((commandAndOptions) => {
+    if (commandAndOptions.debug) {
+      console.error(`Called ${commandAndOptions.name()}`);
+    }
+  });
+```
+
+### TypeScript
+
+If you use `ts-node` and  stand-alone executable subcommands written as `.ts` files, you need to call your program through node to get the subcommands called correctly. e.g.
+
+```bash
+node -r ts-node/register pm.ts
+```
+
+### createCommand()
+
+This factory function creates a new command. It is exported and may be used instead of using `new`, like:
+
+```js
+const { createCommand } = require('commander');
+const program = createCommand();
+```
+
+`createCommand` is also a method of the Command object, and creates a new command rather than a subcommand. This gets used internally
+when creating subcommands using `.command()`, and you may override it to
+customise the new subcommand (example file [custom-command-class.js](./examples/custom-command-class.js)).
+
+### Node options such as `--harmony`
+
+You can enable `--harmony` option in two ways:
+
+- Use `#! /usr/bin/env node --harmony` in the subcommands scripts. (Note Windows does not support this pattern.)
+- Use the `--harmony` option when call the command, like `node --harmony examples/pm publish`. The `--harmony` option will be preserved when spawning subcommand process.
+
+### Debugging stand-alone executable subcommands
+
+An executable subcommand is launched as a separate child process.
+
+If you are using the node inspector for [debugging](https://nodejs.org/en/docs/guides/debugging-getting-started/) executable subcommands using `node --inspect` et al,
+the inspector port is incremented by 1 for the spawned subcommand.
+
+If you are using VSCode to debug executable subcommands you need to set the `"autoAttachChildProcesses": true` flag in your launch.json configuration.
+
+### Override exit and output handling
+
+By default Commander calls `process.exit` when it detects errors, or after displaying the help or version. You can override
+this behaviour and optionally supply a callback. The default override throws a `CommanderError`.
+
+The override callback is passed a `CommanderError` with properties `exitCode` number, `code` string, and `message`. The default override behaviour is to throw the error, except for async handling of executable subcommand completion which carries on. The normal display of error messages or version or help
+is not affected by the override which is called after the display.
+
+```js
+program.exitOverride();
+
+try {
+  program.parse(process.argv);
+} catch (err) {
+  // custom processing...
+}
+```
+
+By default Commander is configured for a command-line application and writes to stdout and stderr.
+You can modify this behaviour for custom applications. In addition, you can modify the display of error messages.
+
+Example file: [configure-output.js](./examples/configure-output.js)
+
+```js
+function errorColor(str) {
+  // Add ANSI escape codes to display text in red.
+  return `\x1b[31m${str}\x1b[0m`;
+}
+
+program
+  .configureOutput({
+    // Visibly override write routines as example!
+    writeOut: (str) => process.stdout.write(`[OUT] ${str}`),
+    writeErr: (str) => process.stdout.write(`[ERR] ${str}`),
+    // Highlight errors in color.
+    outputError: (str, write) => write(errorColor(str))
+  });
+```
+
+### Additional documentation
+
+There is more information available about:
+
+- [deprecated](./docs/deprecated.md) features still supported for backwards compatibility
+- [options taking varying arguments](./docs/options-taking-varying-arguments.md)
+
+## Examples
+
+In a single command program, you might not need an action handler.
+
+Example file: [pizza](./examples/pizza)
+
+```js
+const { program } = require('commander');
+
+program
+  .description('An application for pizza ordering')
+  .option('-p, --peppers', 'Add peppers')
+  .option('-c, --cheese <type>', 'Add the specified type of cheese', 'marble')
+  .option('-C, --no-cheese', 'You do not want any cheese');
+
+program.parse();
+
+const options = program.opts();
+console.log('you ordered a pizza with:');
+if (options.peppers) console.log('  - peppers');
+const cheese = !options.cheese ? 'no' : options.cheese;
+console.log('  - %s cheese', cheese);
+```
+
+In a multi-command program, you will have action handlers for each command (or stand-alone executables for the commands).
+
+Example file: [deploy](./examples/deploy)
+
+```js
+const { Command } = require('commander');
+const program = new Command();
+
+program
+  .version('0.0.1')
+  .option('-c, --config <path>', 'set config path', './deploy.conf');
+
+program
+  .command('setup [env]')
+  .description('run setup commands for all envs')
+  .option('-s, --setup_mode <mode>', 'Which setup mode to use', 'normal')
+  .action((env, options) => {
+    env = env || 'all';
+    console.log('read config from %s', program.opts().config);
+    console.log('setup for %s env(s) with %s mode', env, options.setup_mode);
+  });
+
+program
+  .command('exec <script>')
+  .alias('ex')
+  .description('execute the given remote cmd')
+  .option('-e, --exec_mode <mode>', 'Which exec mode to use', 'fast')
+  .action((script, options) => {
+    console.log('read config from %s', program.opts().config);
+    console.log('exec "%s" using %s mode and config %s', script, options.exec_mode, program.opts().config);
+  }).addHelpText('after', `
+Examples:
+  $ deploy exec sequential
+  $ deploy exec async`
+  );
+
+program.parse(process.argv);
+```
+
+More samples can be found in the [examples](https://github.com/tj/commander.js/tree/master/examples) directory.
+
+## Support
+
+The current version of Commander is fully supported on Long Term Support versions of node, and requires at least node v12.
+(For older versions of node, use an older version of Commander. Commander version 2.x has the widest support.)
+
+The main forum for free and community support is the project [Issues](https://github.com/tj/commander.js/issues) on GitHub.
+
+### Commander for enterprise
+
+Available as part of the Tidelift Subscription
+
+The maintainers of Commander and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. [Learn more.](https://tidelift.com/subscription/pkg/npm-commander?utm_source=npm-commander&utm_medium=referral&utm_campaign=enterprise&utm_term=repo)
Index: frontend/node_modules/commander/esm.mjs
===================================================================
--- frontend/node_modules/commander/esm.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/esm.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,15 @@
+import commander from './index.js';
+
+// wrapper to provide named exports for ESM.
+export const {
+  program,
+  createCommand,
+  createArgument,
+  createOption,
+  CommanderError,
+  InvalidArgumentError,
+  Command,
+  Argument,
+  Option,
+  Help
+} = commander;
Index: frontend/node_modules/commander/index.js
===================================================================
--- frontend/node_modules/commander/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,27 @@
+const { Argument } = require('./lib/argument.js');
+const { Command } = require('./lib/command.js');
+const { CommanderError, InvalidArgumentError } = require('./lib/error.js');
+const { Help } = require('./lib/help.js');
+const { Option } = require('./lib/option.js');
+
+// @ts-check
+
+/**
+ * Expose the root command.
+ */
+
+exports = module.exports = new Command();
+exports.program = exports; // More explicit access to global command.
+// Implicit export of createArgument, createCommand, and createOption.
+
+/**
+ * Expose classes
+ */
+
+exports.Argument = Argument;
+exports.Command = Command;
+exports.CommanderError = CommanderError;
+exports.Help = Help;
+exports.InvalidArgumentError = InvalidArgumentError;
+exports.InvalidOptionArgumentError = InvalidArgumentError; // Deprecated
+exports.Option = Option;
Index: frontend/node_modules/commander/lib/argument.js
===================================================================
--- frontend/node_modules/commander/lib/argument.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/lib/argument.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,147 @@
+const { InvalidArgumentError } = require('./error.js');
+
+// @ts-check
+
+class Argument {
+  /**
+   * Initialize a new command argument with the given name and description.
+   * The default is that the argument is required, and you can explicitly
+   * indicate this with <> around the name. Put [] around the name for an optional argument.
+   *
+   * @param {string} name
+   * @param {string} [description]
+   */
+
+  constructor(name, description) {
+    this.description = description || '';
+    this.variadic = false;
+    this.parseArg = undefined;
+    this.defaultValue = undefined;
+    this.defaultValueDescription = undefined;
+    this.argChoices = undefined;
+
+    switch (name[0]) {
+      case '<': // e.g. <required>
+        this.required = true;
+        this._name = name.slice(1, -1);
+        break;
+      case '[': // e.g. [optional]
+        this.required = false;
+        this._name = name.slice(1, -1);
+        break;
+      default:
+        this.required = true;
+        this._name = name;
+        break;
+    }
+
+    if (this._name.length > 3 && this._name.slice(-3) === '...') {
+      this.variadic = true;
+      this._name = this._name.slice(0, -3);
+    }
+  }
+
+  /**
+   * Return argument name.
+   *
+   * @return {string}
+   */
+
+  name() {
+    return this._name;
+  };
+
+  /**
+   * @api private
+   */
+
+  _concatValue(value, previous) {
+    if (previous === this.defaultValue || !Array.isArray(previous)) {
+      return [value];
+    }
+
+    return previous.concat(value);
+  }
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   *
+   * @param {any} value
+   * @param {string} [description]
+   * @return {Argument}
+   */
+
+  default(value, description) {
+    this.defaultValue = value;
+    this.defaultValueDescription = description;
+    return this;
+  };
+
+  /**
+   * Set the custom handler for processing CLI command arguments into argument values.
+   *
+   * @param {Function} [fn]
+   * @return {Argument}
+   */
+
+  argParser(fn) {
+    this.parseArg = fn;
+    return this;
+  };
+
+  /**
+   * Only allow option value to be one of choices.
+   *
+   * @param {string[]} values
+   * @return {Argument}
+   */
+
+  choices(values) {
+    this.argChoices = values;
+    this.parseArg = (arg, previous) => {
+      if (!values.includes(arg)) {
+        throw new InvalidArgumentError(`Allowed choices are ${values.join(', ')}.`);
+      }
+      if (this.variadic) {
+        return this._concatValue(arg, previous);
+      }
+      return arg;
+    };
+    return this;
+  };
+
+  /**
+   * Make option-argument required.
+   */
+  argRequired() {
+    this.required = true;
+    return this;
+  }
+
+  /**
+   * Make option-argument optional.
+   */
+  argOptional() {
+    this.required = false;
+    return this;
+  }
+}
+
+/**
+ * Takes an argument and returns its human readable equivalent for help usage.
+ *
+ * @param {Argument} arg
+ * @return {string}
+ * @api private
+ */
+
+function humanReadableArgName(arg) {
+  const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
+
+  return arg.required
+    ? '<' + nameOutput + '>'
+    : '[' + nameOutput + ']';
+}
+
+exports.Argument = Argument;
+exports.humanReadableArgName = humanReadableArgName;
Index: frontend/node_modules/commander/lib/command.js
===================================================================
--- frontend/node_modules/commander/lib/command.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/lib/command.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1944 @@
+const EventEmitter = require('events').EventEmitter;
+const childProcess = require('child_process');
+const path = require('path');
+const fs = require('fs');
+
+const { Argument, humanReadableArgName } = require('./argument.js');
+const { CommanderError } = require('./error.js');
+const { Help } = require('./help.js');
+const { Option, splitOptionFlags } = require('./option.js');
+const { suggestSimilar } = require('./suggestSimilar');
+
+// @ts-check
+
+class Command extends EventEmitter {
+  /**
+   * Initialize a new `Command`.
+   *
+   * @param {string} [name]
+   */
+
+  constructor(name) {
+    super();
+    /** @type {Command[]} */
+    this.commands = [];
+    /** @type {Option[]} */
+    this.options = [];
+    this.parent = null;
+    this._allowUnknownOption = false;
+    this._allowExcessArguments = true;
+    /** @type {Argument[]} */
+    this._args = [];
+    /** @type {string[]} */
+    this.args = []; // cli args with options removed
+    this.rawArgs = [];
+    this.processedArgs = []; // like .args but after custom processing and collecting variadic
+    this._scriptPath = null;
+    this._name = name || '';
+    this._optionValues = {};
+    this._optionValueSources = {}; // default < config < env < cli
+    this._storeOptionsAsProperties = false;
+    this._actionHandler = null;
+    this._executableHandler = false;
+    this._executableFile = null; // custom name for executable
+    this._defaultCommandName = null;
+    this._exitCallback = null;
+    this._aliases = [];
+    this._combineFlagAndOptionalValue = true;
+    this._description = '';
+    this._argsDescription = undefined; // legacy
+    this._enablePositionalOptions = false;
+    this._passThroughOptions = false;
+    this._lifeCycleHooks = {}; // a hash of arrays
+    /** @type {boolean | string} */
+    this._showHelpAfterError = false;
+    this._showSuggestionAfterError = false;
+
+    // see .configureOutput() for docs
+    this._outputConfiguration = {
+      writeOut: (str) => process.stdout.write(str),
+      writeErr: (str) => process.stderr.write(str),
+      getOutHelpWidth: () => process.stdout.isTTY ? process.stdout.columns : undefined,
+      getErrHelpWidth: () => process.stderr.isTTY ? process.stderr.columns : undefined,
+      outputError: (str, write) => write(str)
+    };
+
+    this._hidden = false;
+    this._hasHelpOption = true;
+    this._helpFlags = '-h, --help';
+    this._helpDescription = 'display help for command';
+    this._helpShortFlag = '-h';
+    this._helpLongFlag = '--help';
+    this._addImplicitHelpCommand = undefined; // Deliberately undefined, not decided whether true or false
+    this._helpCommandName = 'help';
+    this._helpCommandnameAndArgs = 'help [command]';
+    this._helpCommandDescription = 'display help for command';
+    this._helpConfiguration = {};
+  }
+
+  /**
+   * Copy settings that are useful to have in common across root command and subcommands.
+   *
+   * (Used internally when adding a command using `.command()` so subcommands inherit parent settings.)
+   *
+   * @param {Command} sourceCommand
+   * @return {Command} returns `this` for executable command
+   */
+  copyInheritedSettings(sourceCommand) {
+    this._outputConfiguration = sourceCommand._outputConfiguration;
+    this._hasHelpOption = sourceCommand._hasHelpOption;
+    this._helpFlags = sourceCommand._helpFlags;
+    this._helpDescription = sourceCommand._helpDescription;
+    this._helpShortFlag = sourceCommand._helpShortFlag;
+    this._helpLongFlag = sourceCommand._helpLongFlag;
+    this._helpCommandName = sourceCommand._helpCommandName;
+    this._helpCommandnameAndArgs = sourceCommand._helpCommandnameAndArgs;
+    this._helpCommandDescription = sourceCommand._helpCommandDescription;
+    this._helpConfiguration = sourceCommand._helpConfiguration;
+    this._exitCallback = sourceCommand._exitCallback;
+    this._storeOptionsAsProperties = sourceCommand._storeOptionsAsProperties;
+    this._combineFlagAndOptionalValue = sourceCommand._combineFlagAndOptionalValue;
+    this._allowExcessArguments = sourceCommand._allowExcessArguments;
+    this._enablePositionalOptions = sourceCommand._enablePositionalOptions;
+    this._showHelpAfterError = sourceCommand._showHelpAfterError;
+    this._showSuggestionAfterError = sourceCommand._showSuggestionAfterError;
+
+    return this;
+  }
+
+  /**
+   * Define a command.
+   *
+   * There are two styles of command: pay attention to where to put the description.
+   *
+   * @example
+   * // Command implemented using action handler (description is supplied separately to `.command`)
+   * program
+   *   .command('clone <source> [destination]')
+   *   .description('clone a repository into a newly created directory')
+   *   .action((source, destination) => {
+   *     console.log('clone command called');
+   *   });
+   *
+   * // Command implemented using separate executable file (description is second parameter to `.command`)
+   * program
+   *   .command('start <service>', 'start named service')
+   *   .command('stop [service]', 'stop named service, or all if no name supplied');
+   *
+   * @param {string} nameAndArgs - command name and arguments, args are `<required>` or `[optional]` and last may also be `variadic...`
+   * @param {Object|string} [actionOptsOrExecDesc] - configuration options (for action), or description (for executable)
+   * @param {Object} [execOpts] - configuration options (for executable)
+   * @return {Command} returns new command for action handler, or `this` for executable command
+   */
+
+  command(nameAndArgs, actionOptsOrExecDesc, execOpts) {
+    let desc = actionOptsOrExecDesc;
+    let opts = execOpts;
+    if (typeof desc === 'object' && desc !== null) {
+      opts = desc;
+      desc = null;
+    }
+    opts = opts || {};
+    const [, name, args] = nameAndArgs.match(/([^ ]+) *(.*)/);
+
+    const cmd = this.createCommand(name);
+    if (desc) {
+      cmd.description(desc);
+      cmd._executableHandler = true;
+    }
+    if (opts.isDefault) this._defaultCommandName = cmd._name;
+    cmd._hidden = !!(opts.noHelp || opts.hidden); // noHelp is deprecated old name for hidden
+    cmd._executableFile = opts.executableFile || null; // Custom name for executable file, set missing to null to match constructor
+    if (args) cmd.arguments(args);
+    this.commands.push(cmd);
+    cmd.parent = this;
+    cmd.copyInheritedSettings(this);
+
+    if (desc) return this;
+    return cmd;
+  };
+
+  /**
+   * Factory routine to create a new unattached command.
+   *
+   * See .command() for creating an attached subcommand, which uses this routine to
+   * create the command. You can override createCommand to customise subcommands.
+   *
+   * @param {string} [name]
+   * @return {Command} new command
+   */
+
+  createCommand(name) {
+    return new Command(name);
+  };
+
+  /**
+   * You can customise the help with a subclass of Help by overriding createHelp,
+   * or by overriding Help properties using configureHelp().
+   *
+   * @return {Help}
+   */
+
+  createHelp() {
+    return Object.assign(new Help(), this.configureHelp());
+  };
+
+  /**
+   * You can customise the help by overriding Help properties using configureHelp(),
+   * or with a subclass of Help by overriding createHelp().
+   *
+   * @param {Object} [configuration] - configuration options
+   * @return {Command|Object} `this` command for chaining, or stored configuration
+   */
+
+  configureHelp(configuration) {
+    if (configuration === undefined) return this._helpConfiguration;
+
+    this._helpConfiguration = configuration;
+    return this;
+  }
+
+  /**
+   * The default output goes to stdout and stderr. You can customise this for special
+   * applications. You can also customise the display of errors by overriding outputError.
+   *
+   * The configuration properties are all functions:
+   *
+   *     // functions to change where being written, stdout and stderr
+   *     writeOut(str)
+   *     writeErr(str)
+   *     // matching functions to specify width for wrapping help
+   *     getOutHelpWidth()
+   *     getErrHelpWidth()
+   *     // functions based on what is being written out
+   *     outputError(str, write) // used for displaying errors, and not used for displaying help
+   *
+   * @param {Object} [configuration] - configuration options
+   * @return {Command|Object} `this` command for chaining, or stored configuration
+   */
+
+  configureOutput(configuration) {
+    if (configuration === undefined) return this._outputConfiguration;
+
+    Object.assign(this._outputConfiguration, configuration);
+    return this;
+  }
+
+  /**
+   * Display the help or a custom message after an error occurs.
+   *
+   * @param {boolean|string} [displayHelp]
+   * @return {Command} `this` command for chaining
+   */
+  showHelpAfterError(displayHelp = true) {
+    if (typeof displayHelp !== 'string') displayHelp = !!displayHelp;
+    this._showHelpAfterError = displayHelp;
+    return this;
+  }
+
+  /**
+   * Display suggestion of similar commands for unknown commands, or options for unknown options.
+   *
+   * @param {boolean} [displaySuggestion]
+   * @return {Command} `this` command for chaining
+   */
+  showSuggestionAfterError(displaySuggestion = true) {
+    this._showSuggestionAfterError = !!displaySuggestion;
+    return this;
+  }
+
+  /**
+   * Add a prepared subcommand.
+   *
+   * See .command() for creating an attached subcommand which inherits settings from its parent.
+   *
+   * @param {Command} cmd - new subcommand
+   * @param {Object} [opts] - configuration options
+   * @return {Command} `this` command for chaining
+   */
+
+  addCommand(cmd, opts) {
+    if (!cmd._name) throw new Error('Command passed to .addCommand() must have a name');
+
+    // To keep things simple, block automatic name generation for deeply nested executables.
+    // Fail fast and detect when adding rather than later when parsing.
+    function checkExplicitNames(commandArray) {
+      commandArray.forEach((cmd) => {
+        if (cmd._executableHandler && !cmd._executableFile) {
+          throw new Error(`Must specify executableFile for deeply nested executable: ${cmd.name()}`);
+        }
+        checkExplicitNames(cmd.commands);
+      });
+    }
+    checkExplicitNames(cmd.commands);
+
+    opts = opts || {};
+    if (opts.isDefault) this._defaultCommandName = cmd._name;
+    if (opts.noHelp || opts.hidden) cmd._hidden = true; // modifying passed command due to existing implementation
+
+    this.commands.push(cmd);
+    cmd.parent = this;
+    return this;
+  };
+
+  /**
+   * Factory routine to create a new unattached argument.
+   *
+   * See .argument() for creating an attached argument, which uses this routine to
+   * create the argument. You can override createArgument to return a custom argument.
+   *
+   * @param {string} name
+   * @param {string} [description]
+   * @return {Argument} new argument
+   */
+
+  createArgument(name, description) {
+    return new Argument(name, description);
+  };
+
+  /**
+   * Define argument syntax for command.
+   *
+   * The default is that the argument is required, and you can explicitly
+   * indicate this with <> around the name. Put [] around the name for an optional argument.
+   *
+   * @example
+   * program.argument('<input-file>');
+   * program.argument('[output-file]');
+   *
+   * @param {string} name
+   * @param {string} [description]
+   * @param {Function|*} [fn] - custom argument processing function
+   * @param {*} [defaultValue]
+   * @return {Command} `this` command for chaining
+   */
+  argument(name, description, fn, defaultValue) {
+    const argument = this.createArgument(name, description);
+    if (typeof fn === 'function') {
+      argument.default(defaultValue).argParser(fn);
+    } else {
+      argument.default(fn);
+    }
+    this.addArgument(argument);
+    return this;
+  }
+
+  /**
+   * Define argument syntax for command, adding multiple at once (without descriptions).
+   *
+   * See also .argument().
+   *
+   * @example
+   * program.arguments('<cmd> [env]');
+   *
+   * @param {string} names
+   * @return {Command} `this` command for chaining
+   */
+
+  arguments(names) {
+    names.split(/ +/).forEach((detail) => {
+      this.argument(detail);
+    });
+    return this;
+  };
+
+  /**
+   * Define argument syntax for command, adding a prepared argument.
+   *
+   * @param {Argument} argument
+   * @return {Command} `this` command for chaining
+   */
+  addArgument(argument) {
+    const previousArgument = this._args.slice(-1)[0];
+    if (previousArgument && previousArgument.variadic) {
+      throw new Error(`only the last argument can be variadic '${previousArgument.name()}'`);
+    }
+    if (argument.required && argument.defaultValue !== undefined && argument.parseArg === undefined) {
+      throw new Error(`a default value for a required argument is never used: '${argument.name()}'`);
+    }
+    this._args.push(argument);
+    return this;
+  }
+
+  /**
+   * Override default decision whether to add implicit help command.
+   *
+   *    addHelpCommand() // force on
+   *    addHelpCommand(false); // force off
+   *    addHelpCommand('help [cmd]', 'display help for [cmd]'); // force on with custom details
+   *
+   * @return {Command} `this` command for chaining
+   */
+
+  addHelpCommand(enableOrNameAndArgs, description) {
+    if (enableOrNameAndArgs === false) {
+      this._addImplicitHelpCommand = false;
+    } else {
+      this._addImplicitHelpCommand = true;
+      if (typeof enableOrNameAndArgs === 'string') {
+        this._helpCommandName = enableOrNameAndArgs.split(' ')[0];
+        this._helpCommandnameAndArgs = enableOrNameAndArgs;
+      }
+      this._helpCommandDescription = description || this._helpCommandDescription;
+    }
+    return this;
+  };
+
+  /**
+   * @return {boolean}
+   * @api private
+   */
+
+  _hasImplicitHelpCommand() {
+    if (this._addImplicitHelpCommand === undefined) {
+      return this.commands.length && !this._actionHandler && !this._findCommand('help');
+    }
+    return this._addImplicitHelpCommand;
+  };
+
+  /**
+   * Add hook for life cycle event.
+   *
+   * @param {string} event
+   * @param {Function} listener
+   * @return {Command} `this` command for chaining
+   */
+
+  hook(event, listener) {
+    const allowedValues = ['preAction', 'postAction'];
+    if (!allowedValues.includes(event)) {
+      throw new Error(`Unexpected value for event passed to hook : '${event}'.
+Expecting one of '${allowedValues.join("', '")}'`);
+    }
+    if (this._lifeCycleHooks[event]) {
+      this._lifeCycleHooks[event].push(listener);
+    } else {
+      this._lifeCycleHooks[event] = [listener];
+    }
+    return this;
+  }
+
+  /**
+   * Register callback to use as replacement for calling process.exit.
+   *
+   * @param {Function} [fn] optional callback which will be passed a CommanderError, defaults to throwing
+   * @return {Command} `this` command for chaining
+   */
+
+  exitOverride(fn) {
+    if (fn) {
+      this._exitCallback = fn;
+    } else {
+      this._exitCallback = (err) => {
+        if (err.code !== 'commander.executeSubCommandAsync') {
+          throw err;
+        } else {
+          // Async callback from spawn events, not useful to throw.
+        }
+      };
+    }
+    return this;
+  };
+
+  /**
+   * Call process.exit, and _exitCallback if defined.
+   *
+   * @param {number} exitCode exit code for using with process.exit
+   * @param {string} code an id string representing the error
+   * @param {string} message human-readable description of the error
+   * @return never
+   * @api private
+   */
+
+  _exit(exitCode, code, message) {
+    if (this._exitCallback) {
+      this._exitCallback(new CommanderError(exitCode, code, message));
+      // Expecting this line is not reached.
+    }
+    process.exit(exitCode);
+  };
+
+  /**
+   * Register callback `fn` for the command.
+   *
+   * @example
+   * program
+   *   .command('serve')
+   *   .description('start service')
+   *   .action(function() {
+   *      // do work here
+   *   });
+   *
+   * @param {Function} fn
+   * @return {Command} `this` command for chaining
+   */
+
+  action(fn) {
+    const listener = (args) => {
+      // The .action callback takes an extra parameter which is the command or options.
+      const expectedArgsCount = this._args.length;
+      const actionArgs = args.slice(0, expectedArgsCount);
+      if (this._storeOptionsAsProperties) {
+        actionArgs[expectedArgsCount] = this; // backwards compatible "options"
+      } else {
+        actionArgs[expectedArgsCount] = this.opts();
+      }
+      actionArgs.push(this);
+
+      return fn.apply(this, actionArgs);
+    };
+    this._actionHandler = listener;
+    return this;
+  };
+
+  /**
+   * Factory routine to create a new unattached option.
+   *
+   * See .option() for creating an attached option, which uses this routine to
+   * create the option. You can override createOption to return a custom option.
+   *
+   * @param {string} flags
+   * @param {string} [description]
+   * @return {Option} new option
+   */
+
+  createOption(flags, description) {
+    return new Option(flags, description);
+  };
+
+  /**
+   * Add an option.
+   *
+   * @param {Option} option
+   * @return {Command} `this` command for chaining
+   */
+  addOption(option) {
+    const oname = option.name();
+    const name = option.attributeName();
+
+    let defaultValue = option.defaultValue;
+
+    // preassign default value for --no-*, [optional], <required>, or plain flag if boolean value
+    if (option.negate || option.optional || option.required || typeof defaultValue === 'boolean') {
+      // when --no-foo we make sure default is true, unless a --foo option is already defined
+      if (option.negate) {
+        const positiveLongFlag = option.long.replace(/^--no-/, '--');
+        defaultValue = this._findOption(positiveLongFlag) ? this.getOptionValue(name) : true;
+      }
+      // preassign only if we have a default
+      if (defaultValue !== undefined) {
+        this.setOptionValueWithSource(name, defaultValue, 'default');
+      }
+    }
+
+    // register the option
+    this.options.push(option);
+
+    // handler for cli and env supplied values
+    const handleOptionValue = (val, invalidValueMessage, valueSource) => {
+      // Note: using closure to access lots of lexical scoped variables.
+      const oldValue = this.getOptionValue(name);
+
+      // custom processing
+      if (val !== null && option.parseArg) {
+        try {
+          val = option.parseArg(val, oldValue === undefined ? defaultValue : oldValue);
+        } catch (err) {
+          if (err.code === 'commander.invalidArgument') {
+            const message = `${invalidValueMessage} ${err.message}`;
+            this._displayError(err.exitCode, err.code, message);
+          }
+          throw err;
+        }
+      } else if (val !== null && option.variadic) {
+        val = option._concatValue(val, oldValue);
+      }
+
+      // unassigned or boolean value
+      if (typeof oldValue === 'boolean' || typeof oldValue === 'undefined') {
+        // if no value, negate false, and we have a default, then use it!
+        if (val == null) {
+          this.setOptionValueWithSource(name, option.negate ? false : defaultValue || true, valueSource);
+        } else {
+          this.setOptionValueWithSource(name, val, valueSource);
+        }
+      } else if (val !== null) {
+        // reassign
+        this.setOptionValueWithSource(name, option.negate ? false : val, valueSource);
+      }
+    };
+
+    this.on('option:' + oname, (val) => {
+      const invalidValueMessage = `error: option '${option.flags}' argument '${val}' is invalid.`;
+      handleOptionValue(val, invalidValueMessage, 'cli');
+    });
+
+    if (option.envVar) {
+      this.on('optionEnv:' + oname, (val) => {
+        const invalidValueMessage = `error: option '${option.flags}' value '${val}' from env '${option.envVar}' is invalid.`;
+        handleOptionValue(val, invalidValueMessage, 'env');
+      });
+    }
+
+    return this;
+  }
+
+  /**
+   * Internal implementation shared by .option() and .requiredOption()
+   *
+   * @api private
+   */
+  _optionEx(config, flags, description, fn, defaultValue) {
+    const option = this.createOption(flags, description);
+    option.makeOptionMandatory(!!config.mandatory);
+    if (typeof fn === 'function') {
+      option.default(defaultValue).argParser(fn);
+    } else if (fn instanceof RegExp) {
+      // deprecated
+      const regex = fn;
+      fn = (val, def) => {
+        const m = regex.exec(val);
+        return m ? m[0] : def;
+      };
+      option.default(defaultValue).argParser(fn);
+    } else {
+      option.default(fn);
+    }
+
+    return this.addOption(option);
+  }
+
+  /**
+   * Define option with `flags`, `description` and optional
+   * coercion `fn`.
+   *
+   * The `flags` string contains the short and/or long flags,
+   * separated by comma, a pipe or space. The following are all valid
+   * all will output this way when `--help` is used.
+   *
+   *     "-p, --pepper"
+   *     "-p|--pepper"
+   *     "-p --pepper"
+   *
+   * @example
+   * // simple boolean defaulting to undefined
+   * program.option('-p, --pepper', 'add pepper');
+   *
+   * program.pepper
+   * // => undefined
+   *
+   * --pepper
+   * program.pepper
+   * // => true
+   *
+   * // simple boolean defaulting to true (unless non-negated option is also defined)
+   * program.option('-C, --no-cheese', 'remove cheese');
+   *
+   * program.cheese
+   * // => true
+   *
+   * --no-cheese
+   * program.cheese
+   * // => false
+   *
+   * // required argument
+   * program.option('-C, --chdir <path>', 'change the working directory');
+   *
+   * --chdir /tmp
+   * program.chdir
+   * // => "/tmp"
+   *
+   * // optional argument
+   * program.option('-c, --cheese [type]', 'add cheese [marble]');
+   *
+   * @param {string} flags
+   * @param {string} [description]
+   * @param {Function|*} [fn] - custom option processing function or default value
+   * @param {*} [defaultValue]
+   * @return {Command} `this` command for chaining
+   */
+
+  option(flags, description, fn, defaultValue) {
+    return this._optionEx({}, flags, description, fn, defaultValue);
+  };
+
+  /**
+  * Add a required option which must have a value after parsing. This usually means
+  * the option must be specified on the command line. (Otherwise the same as .option().)
+  *
+  * The `flags` string contains the short and/or long flags, separated by comma, a pipe or space.
+  *
+  * @param {string} flags
+  * @param {string} [description]
+  * @param {Function|*} [fn] - custom option processing function or default value
+  * @param {*} [defaultValue]
+  * @return {Command} `this` command for chaining
+  */
+
+  requiredOption(flags, description, fn, defaultValue) {
+    return this._optionEx({ mandatory: true }, flags, description, fn, defaultValue);
+  };
+
+  /**
+   * Alter parsing of short flags with optional values.
+   *
+   * @example
+   * // for `.option('-f,--flag [value]'):
+   * program.combineFlagAndOptionalValue(true);  // `-f80` is treated like `--flag=80`, this is the default behaviour
+   * program.combineFlagAndOptionalValue(false) // `-fb` is treated like `-f -b`
+   *
+   * @param {Boolean} [combine=true] - if `true` or omitted, an optional value can be specified directly after the flag.
+   */
+  combineFlagAndOptionalValue(combine = true) {
+    this._combineFlagAndOptionalValue = !!combine;
+    return this;
+  };
+
+  /**
+   * Allow unknown options on the command line.
+   *
+   * @param {Boolean} [allowUnknown=true] - if `true` or omitted, no error will be thrown
+   * for unknown options.
+   */
+  allowUnknownOption(allowUnknown = true) {
+    this._allowUnknownOption = !!allowUnknown;
+    return this;
+  };
+
+  /**
+   * Allow excess command-arguments on the command line. Pass false to make excess arguments an error.
+   *
+   * @param {Boolean} [allowExcess=true] - if `true` or omitted, no error will be thrown
+   * for excess arguments.
+   */
+  allowExcessArguments(allowExcess = true) {
+    this._allowExcessArguments = !!allowExcess;
+    return this;
+  };
+
+  /**
+   * Enable positional options. Positional means global options are specified before subcommands which lets
+   * subcommands reuse the same option names, and also enables subcommands to turn on passThroughOptions.
+   * The default behaviour is non-positional and global options may appear anywhere on the command line.
+   *
+   * @param {Boolean} [positional=true]
+   */
+  enablePositionalOptions(positional = true) {
+    this._enablePositionalOptions = !!positional;
+    return this;
+  };
+
+  /**
+   * Pass through options that come after command-arguments rather than treat them as command-options,
+   * so actual command-options come before command-arguments. Turning this on for a subcommand requires
+   * positional options to have been enabled on the program (parent commands).
+   * The default behaviour is non-positional and options may appear before or after command-arguments.
+   *
+   * @param {Boolean} [passThrough=true]
+   * for unknown options.
+   */
+  passThroughOptions(passThrough = true) {
+    this._passThroughOptions = !!passThrough;
+    if (!!this.parent && passThrough && !this.parent._enablePositionalOptions) {
+      throw new Error('passThroughOptions can not be used without turning on enablePositionalOptions for parent command(s)');
+    }
+    return this;
+  };
+
+  /**
+    * Whether to store option values as properties on command object,
+    * or store separately (specify false). In both cases the option values can be accessed using .opts().
+    *
+    * @param {boolean} [storeAsProperties=true]
+    * @return {Command} `this` command for chaining
+    */
+
+  storeOptionsAsProperties(storeAsProperties = true) {
+    this._storeOptionsAsProperties = !!storeAsProperties;
+    if (this.options.length) {
+      throw new Error('call .storeOptionsAsProperties() before adding options');
+    }
+    return this;
+  };
+
+  /**
+   * Retrieve option value.
+   *
+   * @param {string} key
+   * @return {Object} value
+   */
+
+  getOptionValue(key) {
+    if (this._storeOptionsAsProperties) {
+      return this[key];
+    }
+    return this._optionValues[key];
+  };
+
+  /**
+   * Store option value.
+   *
+   * @param {string} key
+   * @param {Object} value
+   * @return {Command} `this` command for chaining
+   */
+
+  setOptionValue(key, value) {
+    if (this._storeOptionsAsProperties) {
+      this[key] = value;
+    } else {
+      this._optionValues[key] = value;
+    }
+    return this;
+  };
+
+  /**
+   * Store option value and where the value came from.
+    *
+    * @param {string} key
+    * @param {Object} value
+    * @param {string} source - expected values are default/config/env/cli
+    * @return {Command} `this` command for chaining
+    */
+
+  setOptionValueWithSource(key, value, source) {
+    this.setOptionValue(key, value);
+    this._optionValueSources[key] = source;
+    return this;
+  }
+
+  /**
+    * Get source of option value.
+    * Expected values are default | config | env | cli
+    *
+    * @param {string} key
+    * @return {string}
+    */
+
+  getOptionValueSource(key) {
+    return this._optionValueSources[key];
+  };
+
+  /**
+   * Get user arguments implied or explicit arguments.
+   * Side-effects: set _scriptPath if args included application, and use that to set implicit command name.
+   *
+   * @api private
+   */
+
+  _prepareUserArgs(argv, parseOptions) {
+    if (argv !== undefined && !Array.isArray(argv)) {
+      throw new Error('first parameter to parse must be array or undefined');
+    }
+    parseOptions = parseOptions || {};
+
+    // Default to using process.argv
+    if (argv === undefined) {
+      argv = process.argv;
+      // @ts-ignore: unknown property
+      if (process.versions && process.versions.electron) {
+        parseOptions.from = 'electron';
+      }
+    }
+    this.rawArgs = argv.slice();
+
+    // make it a little easier for callers by supporting various argv conventions
+    let userArgs;
+    switch (parseOptions.from) {
+      case undefined:
+      case 'node':
+        this._scriptPath = argv[1];
+        userArgs = argv.slice(2);
+        break;
+      case 'electron':
+        // @ts-ignore: unknown property
+        if (process.defaultApp) {
+          this._scriptPath = argv[1];
+          userArgs = argv.slice(2);
+        } else {
+          userArgs = argv.slice(1);
+        }
+        break;
+      case 'user':
+        userArgs = argv.slice(0);
+        break;
+      default:
+        throw new Error(`unexpected parse option { from: '${parseOptions.from}' }`);
+    }
+    if (!this._scriptPath && require.main) {
+      this._scriptPath = require.main.filename;
+    }
+
+    // Guess name, used in usage in help.
+    this._name = this._name || (this._scriptPath && path.basename(this._scriptPath, path.extname(this._scriptPath)));
+
+    return userArgs;
+  }
+
+  /**
+   * Parse `argv`, setting options and invoking commands when defined.
+   *
+   * The default expectation is that the arguments are from node and have the application as argv[0]
+   * and the script being run in argv[1], with user parameters after that.
+   *
+   * @example
+   * program.parse(process.argv);
+   * program.parse(); // implicitly use process.argv and auto-detect node vs electron conventions
+   * program.parse(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
+   *
+   * @param {string[]} [argv] - optional, defaults to process.argv
+   * @param {Object} [parseOptions] - optionally specify style of options with from: node/user/electron
+   * @param {string} [parseOptions.from] - where the args are from: 'node', 'user', 'electron'
+   * @return {Command} `this` command for chaining
+   */
+
+  parse(argv, parseOptions) {
+    const userArgs = this._prepareUserArgs(argv, parseOptions);
+    this._parseCommand([], userArgs);
+
+    return this;
+  };
+
+  /**
+   * Parse `argv`, setting options and invoking commands when defined.
+   *
+   * Use parseAsync instead of parse if any of your action handlers are async. Returns a Promise.
+   *
+   * The default expectation is that the arguments are from node and have the application as argv[0]
+   * and the script being run in argv[1], with user parameters after that.
+   *
+   * @example
+   * await program.parseAsync(process.argv);
+   * await program.parseAsync(); // implicitly use process.argv and auto-detect node vs electron conventions
+   * await program.parseAsync(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
+   *
+   * @param {string[]} [argv]
+   * @param {Object} [parseOptions]
+   * @param {string} parseOptions.from - where the args are from: 'node', 'user', 'electron'
+   * @return {Promise}
+   */
+
+  async parseAsync(argv, parseOptions) {
+    const userArgs = this._prepareUserArgs(argv, parseOptions);
+    await this._parseCommand([], userArgs);
+
+    return this;
+  };
+
+  /**
+   * Execute a sub-command executable.
+   *
+   * @api private
+   */
+
+  _executeSubCommand(subcommand, args) {
+    args = args.slice();
+    let launchWithNode = false; // Use node for source targets so do not need to get permissions correct, and on Windows.
+    const sourceExt = ['.js', '.ts', '.tsx', '.mjs', '.cjs'];
+
+    // Not checking for help first. Unlikely to have mandatory and executable, and can't robustly test for help flags in external command.
+    this._checkForMissingMandatoryOptions();
+
+    // Want the entry script as the reference for command name and directory for searching for other files.
+    let scriptPath = this._scriptPath;
+    // Fallback in case not set, due to how Command created or called.
+    if (!scriptPath && require.main) {
+      scriptPath = require.main.filename;
+    }
+
+    let baseDir;
+    try {
+      const resolvedLink = fs.realpathSync(scriptPath);
+      baseDir = path.dirname(resolvedLink);
+    } catch (e) {
+      baseDir = '.'; // dummy, probably not going to find executable!
+    }
+
+    // name of the subcommand, like `pm-install`
+    let bin = path.basename(scriptPath, path.extname(scriptPath)) + '-' + subcommand._name;
+    if (subcommand._executableFile) {
+      bin = subcommand._executableFile;
+    }
+
+    const localBin = path.join(baseDir, bin);
+    if (fs.existsSync(localBin)) {
+      // prefer local `./<bin>` to bin in the $PATH
+      bin = localBin;
+    } else {
+      // Look for source files.
+      sourceExt.forEach((ext) => {
+        if (fs.existsSync(`${localBin}${ext}`)) {
+          bin = `${localBin}${ext}`;
+        }
+      });
+    }
+    launchWithNode = sourceExt.includes(path.extname(bin));
+
+    let proc;
+    if (process.platform !== 'win32') {
+      if (launchWithNode) {
+        args.unshift(bin);
+        // add executable arguments to spawn
+        args = incrementNodeInspectorPort(process.execArgv).concat(args);
+
+        proc = childProcess.spawn(process.argv[0], args, { stdio: 'inherit' });
+      } else {
+        proc = childProcess.spawn(bin, args, { stdio: 'inherit' });
+      }
+    } else {
+      args.unshift(bin);
+      // add executable arguments to spawn
+      args = incrementNodeInspectorPort(process.execArgv).concat(args);
+      proc = childProcess.spawn(process.execPath, args, { stdio: 'inherit' });
+    }
+
+    const signals = ['SIGUSR1', 'SIGUSR2', 'SIGTERM', 'SIGINT', 'SIGHUP'];
+    signals.forEach((signal) => {
+      // @ts-ignore
+      process.on(signal, () => {
+        if (proc.killed === false && proc.exitCode === null) {
+          proc.kill(signal);
+        }
+      });
+    });
+
+    // By default terminate process when spawned process terminates.
+    // Suppressing the exit if exitCallback defined is a bit messy and of limited use, but does allow process to stay running!
+    const exitCallback = this._exitCallback;
+    if (!exitCallback) {
+      proc.on('close', process.exit.bind(process));
+    } else {
+      proc.on('close', () => {
+        exitCallback(new CommanderError(process.exitCode || 0, 'commander.executeSubCommandAsync', '(close)'));
+      });
+    }
+    proc.on('error', (err) => {
+      // @ts-ignore
+      if (err.code === 'ENOENT') {
+        const executableMissing = `'${bin}' does not exist
+ - if '${subcommand._name}' is not meant to be an executable command, remove description parameter from '.command()' and use '.description()' instead
+ - if the default executable name is not suitable, use the executableFile option to supply a custom name`;
+        throw new Error(executableMissing);
+      // @ts-ignore
+      } else if (err.code === 'EACCES') {
+        throw new Error(`'${bin}' not executable`);
+      }
+      if (!exitCallback) {
+        process.exit(1);
+      } else {
+        const wrappedError = new CommanderError(1, 'commander.executeSubCommandAsync', '(error)');
+        wrappedError.nestedError = err;
+        exitCallback(wrappedError);
+      }
+    });
+
+    // Store the reference to the child process
+    this.runningCommand = proc;
+  };
+
+  /**
+   * @api private
+   */
+
+  _dispatchSubcommand(commandName, operands, unknown) {
+    const subCommand = this._findCommand(commandName);
+    if (!subCommand) this.help({ error: true });
+
+    if (subCommand._executableHandler) {
+      this._executeSubCommand(subCommand, operands.concat(unknown));
+    } else {
+      return subCommand._parseCommand(operands, unknown);
+    }
+  };
+
+  /**
+   * Check this.args against expected this._args.
+   *
+   * @api private
+   */
+
+  _checkNumberOfArguments() {
+    // too few
+    this._args.forEach((arg, i) => {
+      if (arg.required && this.args[i] == null) {
+        this.missingArgument(arg.name());
+      }
+    });
+    // too many
+    if (this._args.length > 0 && this._args[this._args.length - 1].variadic) {
+      return;
+    }
+    if (this.args.length > this._args.length) {
+      this._excessArguments(this.args);
+    }
+  };
+
+  /**
+   * Process this.args using this._args and save as this.processedArgs!
+   *
+   * @api private
+   */
+
+  _processArguments() {
+    const myParseArg = (argument, value, previous) => {
+      // Extra processing for nice error message on parsing failure.
+      let parsedValue = value;
+      if (value !== null && argument.parseArg) {
+        try {
+          parsedValue = argument.parseArg(value, previous);
+        } catch (err) {
+          if (err.code === 'commander.invalidArgument') {
+            const message = `error: command-argument value '${value}' is invalid for argument '${argument.name()}'. ${err.message}`;
+            this._displayError(err.exitCode, err.code, message);
+          }
+          throw err;
+        }
+      }
+      return parsedValue;
+    };
+
+    this._checkNumberOfArguments();
+
+    const processedArgs = [];
+    this._args.forEach((declaredArg, index) => {
+      let value = declaredArg.defaultValue;
+      if (declaredArg.variadic) {
+        // Collect together remaining arguments for passing together as an array.
+        if (index < this.args.length) {
+          value = this.args.slice(index);
+          if (declaredArg.parseArg) {
+            value = value.reduce((processed, v) => {
+              return myParseArg(declaredArg, v, processed);
+            }, declaredArg.defaultValue);
+          }
+        } else if (value === undefined) {
+          value = [];
+        }
+      } else if (index < this.args.length) {
+        value = this.args[index];
+        if (declaredArg.parseArg) {
+          value = myParseArg(declaredArg, value, declaredArg.defaultValue);
+        }
+      }
+      processedArgs[index] = value;
+    });
+    this.processedArgs = processedArgs;
+  }
+
+  /**
+   * Once we have a promise we chain, but call synchronously until then.
+   *
+   * @param {Promise|undefined} promise
+   * @param {Function} fn
+   * @return {Promise|undefined}
+   * @api private
+   */
+
+  _chainOrCall(promise, fn) {
+    // thenable
+    if (promise && promise.then && typeof promise.then === 'function') {
+      // already have a promise, chain callback
+      return promise.then(() => fn());
+    }
+    // callback might return a promise
+    return fn();
+  }
+
+  /**
+   *
+   * @param {Promise|undefined} promise
+   * @param {string} event
+   * @return {Promise|undefined}
+   * @api private
+   */
+
+  _chainOrCallHooks(promise, event) {
+    let result = promise;
+    const hooks = [];
+    getCommandAndParents(this)
+      .reverse()
+      .filter(cmd => cmd._lifeCycleHooks[event] !== undefined)
+      .forEach(hookedCommand => {
+        hookedCommand._lifeCycleHooks[event].forEach((callback) => {
+          hooks.push({ hookedCommand, callback });
+        });
+      });
+    if (event === 'postAction') {
+      hooks.reverse();
+    }
+
+    hooks.forEach((hookDetail) => {
+      result = this._chainOrCall(result, () => {
+        return hookDetail.callback(hookDetail.hookedCommand, this);
+      });
+    });
+    return result;
+  }
+
+  /**
+   * Process arguments in context of this command.
+   * Returns action result, in case it is a promise.
+   *
+   * @api private
+   */
+
+  _parseCommand(operands, unknown) {
+    const parsed = this.parseOptions(unknown);
+    this._parseOptionsEnv(); // after cli, so parseArg not called on both cli and env
+    operands = operands.concat(parsed.operands);
+    unknown = parsed.unknown;
+    this.args = operands.concat(unknown);
+
+    if (operands && this._findCommand(operands[0])) {
+      return this._dispatchSubcommand(operands[0], operands.slice(1), unknown);
+    }
+    if (this._hasImplicitHelpCommand() && operands[0] === this._helpCommandName) {
+      if (operands.length === 1) {
+        this.help();
+      }
+      return this._dispatchSubcommand(operands[1], [], [this._helpLongFlag]);
+    }
+    if (this._defaultCommandName) {
+      outputHelpIfRequested(this, unknown); // Run the help for default command from parent rather than passing to default command
+      return this._dispatchSubcommand(this._defaultCommandName, operands, unknown);
+    }
+    if (this.commands.length && this.args.length === 0 && !this._actionHandler && !this._defaultCommandName) {
+      // probably missing subcommand and no handler, user needs help (and exit)
+      this.help({ error: true });
+    }
+
+    outputHelpIfRequested(this, parsed.unknown);
+    this._checkForMissingMandatoryOptions();
+
+    // We do not always call this check to avoid masking a "better" error, like unknown command.
+    const checkForUnknownOptions = () => {
+      if (parsed.unknown.length > 0) {
+        this.unknownOption(parsed.unknown[0]);
+      }
+    };
+
+    const commandEvent = `command:${this.name()}`;
+    if (this._actionHandler) {
+      checkForUnknownOptions();
+      this._processArguments();
+
+      let actionResult;
+      actionResult = this._chainOrCallHooks(actionResult, 'preAction');
+      actionResult = this._chainOrCall(actionResult, () => this._actionHandler(this.processedArgs));
+      if (this.parent) this.parent.emit(commandEvent, operands, unknown); // legacy
+      actionResult = this._chainOrCallHooks(actionResult, 'postAction');
+      return actionResult;
+    }
+    if (this.parent && this.parent.listenerCount(commandEvent)) {
+      checkForUnknownOptions();
+      this._processArguments();
+      this.parent.emit(commandEvent, operands, unknown); // legacy
+    } else if (operands.length) {
+      if (this._findCommand('*')) { // legacy default command
+        return this._dispatchSubcommand('*', operands, unknown);
+      }
+      if (this.listenerCount('command:*')) {
+        // skip option check, emit event for possible misspelling suggestion
+        this.emit('command:*', operands, unknown);
+      } else if (this.commands.length) {
+        this.unknownCommand();
+      } else {
+        checkForUnknownOptions();
+        this._processArguments();
+      }
+    } else if (this.commands.length) {
+      checkForUnknownOptions();
+      // This command has subcommands and nothing hooked up at this level, so display help (and exit).
+      this.help({ error: true });
+    } else {
+      checkForUnknownOptions();
+      this._processArguments();
+      // fall through for caller to handle after calling .parse()
+    }
+  };
+
+  /**
+   * Find matching command.
+   *
+   * @api private
+   */
+  _findCommand(name) {
+    if (!name) return undefined;
+    return this.commands.find(cmd => cmd._name === name || cmd._aliases.includes(name));
+  };
+
+  /**
+   * Return an option matching `arg` if any.
+   *
+   * @param {string} arg
+   * @return {Option}
+   * @api private
+   */
+
+  _findOption(arg) {
+    return this.options.find(option => option.is(arg));
+  };
+
+  /**
+   * Display an error message if a mandatory option does not have a value.
+   * Lazy calling after checking for help flags from leaf subcommand.
+   *
+   * @api private
+   */
+
+  _checkForMissingMandatoryOptions() {
+    // Walk up hierarchy so can call in subcommand after checking for displaying help.
+    for (let cmd = this; cmd; cmd = cmd.parent) {
+      cmd.options.forEach((anOption) => {
+        if (anOption.mandatory && (cmd.getOptionValue(anOption.attributeName()) === undefined)) {
+          cmd.missingMandatoryOptionValue(anOption);
+        }
+      });
+    }
+  };
+
+  /**
+   * Parse options from `argv` removing known options,
+   * and return argv split into operands and unknown arguments.
+   *
+   * Examples:
+   *
+   *     argv => operands, unknown
+   *     --known kkk op => [op], []
+   *     op --known kkk => [op], []
+   *     sub --unknown uuu op => [sub], [--unknown uuu op]
+   *     sub -- --unknown uuu op => [sub --unknown uuu op], []
+   *
+   * @param {String[]} argv
+   * @return {{operands: String[], unknown: String[]}}
+   */
+
+  parseOptions(argv) {
+    const operands = []; // operands, not options or values
+    const unknown = []; // first unknown option and remaining unknown args
+    let dest = operands;
+    const args = argv.slice();
+
+    function maybeOption(arg) {
+      return arg.length > 1 && arg[0] === '-';
+    }
+
+    // parse options
+    let activeVariadicOption = null;
+    while (args.length) {
+      const arg = args.shift();
+
+      // literal
+      if (arg === '--') {
+        if (dest === unknown) dest.push(arg);
+        dest.push(...args);
+        break;
+      }
+
+      if (activeVariadicOption && !maybeOption(arg)) {
+        this.emit(`option:${activeVariadicOption.name()}`, arg);
+        continue;
+      }
+      activeVariadicOption = null;
+
+      if (maybeOption(arg)) {
+        const option = this._findOption(arg);
+        // recognised option, call listener to assign value with possible custom processing
+        if (option) {
+          if (option.required) {
+            const value = args.shift();
+            if (value === undefined) this.optionMissingArgument(option);
+            this.emit(`option:${option.name()}`, value);
+          } else if (option.optional) {
+            let value = null;
+            // historical behaviour is optional value is following arg unless an option
+            if (args.length > 0 && !maybeOption(args[0])) {
+              value = args.shift();
+            }
+            this.emit(`option:${option.name()}`, value);
+          } else { // boolean flag
+            this.emit(`option:${option.name()}`);
+          }
+          activeVariadicOption = option.variadic ? option : null;
+          continue;
+        }
+      }
+
+      // Look for combo options following single dash, eat first one if known.
+      if (arg.length > 2 && arg[0] === '-' && arg[1] !== '-') {
+        const option = this._findOption(`-${arg[1]}`);
+        if (option) {
+          if (option.required || (option.optional && this._combineFlagAndOptionalValue)) {
+            // option with value following in same argument
+            this.emit(`option:${option.name()}`, arg.slice(2));
+          } else {
+            // boolean option, emit and put back remainder of arg for further processing
+            this.emit(`option:${option.name()}`);
+            args.unshift(`-${arg.slice(2)}`);
+          }
+          continue;
+        }
+      }
+
+      // Look for known long flag with value, like --foo=bar
+      if (/^--[^=]+=/.test(arg)) {
+        const index = arg.indexOf('=');
+        const option = this._findOption(arg.slice(0, index));
+        if (option && (option.required || option.optional)) {
+          this.emit(`option:${option.name()}`, arg.slice(index + 1));
+          continue;
+        }
+      }
+
+      // Not a recognised option by this command.
+      // Might be a command-argument, or subcommand option, or unknown option, or help command or option.
+
+      // An unknown option means further arguments also classified as unknown so can be reprocessed by subcommands.
+      if (maybeOption(arg)) {
+        dest = unknown;
+      }
+
+      // If using positionalOptions, stop processing our options at subcommand.
+      if ((this._enablePositionalOptions || this._passThroughOptions) && operands.length === 0 && unknown.length === 0) {
+        if (this._findCommand(arg)) {
+          operands.push(arg);
+          if (args.length > 0) unknown.push(...args);
+          break;
+        } else if (arg === this._helpCommandName && this._hasImplicitHelpCommand()) {
+          operands.push(arg);
+          if (args.length > 0) operands.push(...args);
+          break;
+        } else if (this._defaultCommandName) {
+          unknown.push(arg);
+          if (args.length > 0) unknown.push(...args);
+          break;
+        }
+      }
+
+      // If using passThroughOptions, stop processing options at first command-argument.
+      if (this._passThroughOptions) {
+        dest.push(arg);
+        if (args.length > 0) dest.push(...args);
+        break;
+      }
+
+      // add arg
+      dest.push(arg);
+    }
+
+    return { operands, unknown };
+  };
+
+  /**
+   * Return an object containing options as key-value pairs
+   *
+   * @return {Object}
+   */
+  opts() {
+    if (this._storeOptionsAsProperties) {
+      // Preserve original behaviour so backwards compatible when still using properties
+      const result = {};
+      const len = this.options.length;
+
+      for (let i = 0; i < len; i++) {
+        const key = this.options[i].attributeName();
+        result[key] = key === this._versionOptionName ? this._version : this[key];
+      }
+      return result;
+    }
+
+    return this._optionValues;
+  };
+
+  /**
+   * Internal bottleneck for handling of parsing errors.
+   *
+   * @api private
+   */
+  _displayError(exitCode, code, message) {
+    this._outputConfiguration.outputError(`${message}\n`, this._outputConfiguration.writeErr);
+    if (typeof this._showHelpAfterError === 'string') {
+      this._outputConfiguration.writeErr(`${this._showHelpAfterError}\n`);
+    } else if (this._showHelpAfterError) {
+      this._outputConfiguration.writeErr('\n');
+      this.outputHelp({ error: true });
+    }
+    this._exit(exitCode, code, message);
+  }
+
+  /**
+   * Apply any option related environment variables, if option does
+   * not have a value from cli or client code.
+   *
+   * @api private
+   */
+  _parseOptionsEnv() {
+    this.options.forEach((option) => {
+      if (option.envVar && option.envVar in process.env) {
+        const optionKey = option.attributeName();
+        // Priority check. Do not overwrite cli or options from unknown source (client-code).
+        if (this.getOptionValue(optionKey) === undefined || ['default', 'config', 'env'].includes(this.getOptionValueSource(optionKey))) {
+          if (option.required || option.optional) { // option can take a value
+            // keep very simple, optional always takes value
+            this.emit(`optionEnv:${option.name()}`, process.env[option.envVar]);
+          } else { // boolean
+            // keep very simple, only care that envVar defined and not the value
+            this.emit(`optionEnv:${option.name()}`);
+          }
+        }
+      }
+    });
+  }
+
+  /**
+   * Argument `name` is missing.
+   *
+   * @param {string} name
+   * @api private
+   */
+
+  missingArgument(name) {
+    const message = `error: missing required argument '${name}'`;
+    this._displayError(1, 'commander.missingArgument', message);
+  };
+
+  /**
+   * `Option` is missing an argument.
+   *
+   * @param {Option} option
+   * @api private
+   */
+
+  optionMissingArgument(option) {
+    const message = `error: option '${option.flags}' argument missing`;
+    this._displayError(1, 'commander.optionMissingArgument', message);
+  };
+
+  /**
+   * `Option` does not have a value, and is a mandatory option.
+   *
+   * @param {Option} option
+   * @api private
+   */
+
+  missingMandatoryOptionValue(option) {
+    const message = `error: required option '${option.flags}' not specified`;
+    this._displayError(1, 'commander.missingMandatoryOptionValue', message);
+  };
+
+  /**
+   * Unknown option `flag`.
+   *
+   * @param {string} flag
+   * @api private
+   */
+
+  unknownOption(flag) {
+    if (this._allowUnknownOption) return;
+    let suggestion = '';
+
+    if (flag.startsWith('--') && this._showSuggestionAfterError) {
+      // Looping to pick up the global options too
+      let candidateFlags = [];
+      let command = this;
+      do {
+        const moreFlags = command.createHelp().visibleOptions(command)
+          .filter(option => option.long)
+          .map(option => option.long);
+        candidateFlags = candidateFlags.concat(moreFlags);
+        command = command.parent;
+      } while (command && !command._enablePositionalOptions);
+      suggestion = suggestSimilar(flag, candidateFlags);
+    }
+
+    const message = `error: unknown option '${flag}'${suggestion}`;
+    this._displayError(1, 'commander.unknownOption', message);
+  };
+
+  /**
+   * Excess arguments, more than expected.
+   *
+   * @param {string[]} receivedArgs
+   * @api private
+   */
+
+  _excessArguments(receivedArgs) {
+    if (this._allowExcessArguments) return;
+
+    const expected = this._args.length;
+    const s = (expected === 1) ? '' : 's';
+    const forSubcommand = this.parent ? ` for '${this.name()}'` : '';
+    const message = `error: too many arguments${forSubcommand}. Expected ${expected} argument${s} but got ${receivedArgs.length}.`;
+    this._displayError(1, 'commander.excessArguments', message);
+  };
+
+  /**
+   * Unknown command.
+   *
+   * @api private
+   */
+
+  unknownCommand() {
+    const unknownName = this.args[0];
+    let suggestion = '';
+
+    if (this._showSuggestionAfterError) {
+      const candidateNames = [];
+      this.createHelp().visibleCommands(this).forEach((command) => {
+        candidateNames.push(command.name());
+        // just visible alias
+        if (command.alias()) candidateNames.push(command.alias());
+      });
+      suggestion = suggestSimilar(unknownName, candidateNames);
+    }
+
+    const message = `error: unknown command '${unknownName}'${suggestion}`;
+    this._displayError(1, 'commander.unknownCommand', message);
+  };
+
+  /**
+   * Set the program version to `str`.
+   *
+   * This method auto-registers the "-V, --version" flag
+   * which will print the version number when passed.
+   *
+   * You can optionally supply the  flags and description to override the defaults.
+   *
+   * @param {string} str
+   * @param {string} [flags]
+   * @param {string} [description]
+   * @return {this | string} `this` command for chaining, or version string if no arguments
+   */
+
+  version(str, flags, description) {
+    if (str === undefined) return this._version;
+    this._version = str;
+    flags = flags || '-V, --version';
+    description = description || 'output the version number';
+    const versionOption = this.createOption(flags, description);
+    this._versionOptionName = versionOption.attributeName();
+    this.options.push(versionOption);
+    this.on('option:' + versionOption.name(), () => {
+      this._outputConfiguration.writeOut(`${str}\n`);
+      this._exit(0, 'commander.version', str);
+    });
+    return this;
+  };
+
+  /**
+   * Set the description to `str`.
+   *
+   * @param {string} [str]
+   * @param {Object} [argsDescription]
+   * @return {string|Command}
+   */
+  description(str, argsDescription) {
+    if (str === undefined && argsDescription === undefined) return this._description;
+    this._description = str;
+    if (argsDescription) {
+      this._argsDescription = argsDescription;
+    }
+    return this;
+  };
+
+  /**
+   * Set an alias for the command.
+   *
+   * You may call more than once to add multiple aliases. Only the first alias is shown in the auto-generated help.
+   *
+   * @param {string} [alias]
+   * @return {string|Command}
+   */
+
+  alias(alias) {
+    if (alias === undefined) return this._aliases[0]; // just return first, for backwards compatibility
+
+    /** @type {Command} */
+    let command = this;
+    if (this.commands.length !== 0 && this.commands[this.commands.length - 1]._executableHandler) {
+      // assume adding alias for last added executable subcommand, rather than this
+      command = this.commands[this.commands.length - 1];
+    }
+
+    if (alias === command._name) throw new Error('Command alias can\'t be the same as its name');
+
+    command._aliases.push(alias);
+    return this;
+  };
+
+  /**
+   * Set aliases for the command.
+   *
+   * Only the first alias is shown in the auto-generated help.
+   *
+   * @param {string[]} [aliases]
+   * @return {string[]|Command}
+   */
+
+  aliases(aliases) {
+    // Getter for the array of aliases is the main reason for having aliases() in addition to alias().
+    if (aliases === undefined) return this._aliases;
+
+    aliases.forEach((alias) => this.alias(alias));
+    return this;
+  };
+
+  /**
+   * Set / get the command usage `str`.
+   *
+   * @param {string} [str]
+   * @return {String|Command}
+   */
+
+  usage(str) {
+    if (str === undefined) {
+      if (this._usage) return this._usage;
+
+      const args = this._args.map((arg) => {
+        return humanReadableArgName(arg);
+      });
+      return [].concat(
+        (this.options.length || this._hasHelpOption ? '[options]' : []),
+        (this.commands.length ? '[command]' : []),
+        (this._args.length ? args : [])
+      ).join(' ');
+    }
+
+    this._usage = str;
+    return this;
+  };
+
+  /**
+   * Get or set the name of the command
+   *
+   * @param {string} [str]
+   * @return {string|Command}
+   */
+
+  name(str) {
+    if (str === undefined) return this._name;
+    this._name = str;
+    return this;
+  };
+
+  /**
+   * Return program help documentation.
+   *
+   * @param {{ error: boolean }} [contextOptions] - pass {error:true} to wrap for stderr instead of stdout
+   * @return {string}
+   */
+
+  helpInformation(contextOptions) {
+    const helper = this.createHelp();
+    if (helper.helpWidth === undefined) {
+      helper.helpWidth = (contextOptions && contextOptions.error) ? this._outputConfiguration.getErrHelpWidth() : this._outputConfiguration.getOutHelpWidth();
+    }
+    return helper.formatHelp(this, helper);
+  };
+
+  /**
+   * @api private
+   */
+
+  _getHelpContext(contextOptions) {
+    contextOptions = contextOptions || {};
+    const context = { error: !!contextOptions.error };
+    let write;
+    if (context.error) {
+      write = (arg) => this._outputConfiguration.writeErr(arg);
+    } else {
+      write = (arg) => this._outputConfiguration.writeOut(arg);
+    }
+    context.write = contextOptions.write || write;
+    context.command = this;
+    return context;
+  }
+
+  /**
+   * Output help information for this command.
+   *
+   * Outputs built-in help, and custom text added using `.addHelpText()`.
+   *
+   * @param {{ error: boolean } | Function} [contextOptions] - pass {error:true} to write to stderr instead of stdout
+   */
+
+  outputHelp(contextOptions) {
+    let deprecatedCallback;
+    if (typeof contextOptions === 'function') {
+      deprecatedCallback = contextOptions;
+      contextOptions = undefined;
+    }
+    const context = this._getHelpContext(contextOptions);
+
+    getCommandAndParents(this).reverse().forEach(command => command.emit('beforeAllHelp', context));
+    this.emit('beforeHelp', context);
+
+    let helpInformation = this.helpInformation(context);
+    if (deprecatedCallback) {
+      helpInformation = deprecatedCallback(helpInformation);
+      if (typeof helpInformation !== 'string' && !Buffer.isBuffer(helpInformation)) {
+        throw new Error('outputHelp callback must return a string or a Buffer');
+      }
+    }
+    context.write(helpInformation);
+
+    this.emit(this._helpLongFlag); // deprecated
+    this.emit('afterHelp', context);
+    getCommandAndParents(this).forEach(command => command.emit('afterAllHelp', context));
+  };
+
+  /**
+   * You can pass in flags and a description to override the help
+   * flags and help description for your command. Pass in false to
+   * disable the built-in help option.
+   *
+   * @param {string | boolean} [flags]
+   * @param {string} [description]
+   * @return {Command} `this` command for chaining
+   */
+
+  helpOption(flags, description) {
+    if (typeof flags === 'boolean') {
+      this._hasHelpOption = flags;
+      return this;
+    }
+    this._helpFlags = flags || this._helpFlags;
+    this._helpDescription = description || this._helpDescription;
+
+    const helpFlags = splitOptionFlags(this._helpFlags);
+    this._helpShortFlag = helpFlags.shortFlag;
+    this._helpLongFlag = helpFlags.longFlag;
+
+    return this;
+  };
+
+  /**
+   * Output help information and exit.
+   *
+   * Outputs built-in help, and custom text added using `.addHelpText()`.
+   *
+   * @param {{ error: boolean }} [contextOptions] - pass {error:true} to write to stderr instead of stdout
+   */
+
+  help(contextOptions) {
+    this.outputHelp(contextOptions);
+    let exitCode = process.exitCode || 0;
+    if (exitCode === 0 && contextOptions && typeof contextOptions !== 'function' && contextOptions.error) {
+      exitCode = 1;
+    }
+    // message: do not have all displayed text available so only passing placeholder.
+    this._exit(exitCode, 'commander.help', '(outputHelp)');
+  };
+
+  /**
+   * Add additional text to be displayed with the built-in help.
+   *
+   * Position is 'before' or 'after' to affect just this command,
+   * and 'beforeAll' or 'afterAll' to affect this command and all its subcommands.
+   *
+   * @param {string} position - before or after built-in help
+   * @param {string | Function} text - string to add, or a function returning a string
+   * @return {Command} `this` command for chaining
+   */
+  addHelpText(position, text) {
+    const allowedValues = ['beforeAll', 'before', 'after', 'afterAll'];
+    if (!allowedValues.includes(position)) {
+      throw new Error(`Unexpected value for position to addHelpText.
+Expecting one of '${allowedValues.join("', '")}'`);
+    }
+    const helpEvent = `${position}Help`;
+    this.on(helpEvent, (context) => {
+      let helpStr;
+      if (typeof text === 'function') {
+        helpStr = text({ error: context.error, command: context.command });
+      } else {
+        helpStr = text;
+      }
+      // Ignore falsy value when nothing to output.
+      if (helpStr) {
+        context.write(`${helpStr}\n`);
+      }
+    });
+    return this;
+  }
+};
+
+/**
+ * Output help information if help flags specified
+ *
+ * @param {Command} cmd - command to output help for
+ * @param {Array} args - array of options to search for help flags
+ * @api private
+ */
+
+function outputHelpIfRequested(cmd, args) {
+  const helpOption = cmd._hasHelpOption && args.find(arg => arg === cmd._helpLongFlag || arg === cmd._helpShortFlag);
+  if (helpOption) {
+    cmd.outputHelp();
+    // (Do not have all displayed text available so only passing placeholder.)
+    cmd._exit(0, 'commander.helpDisplayed', '(outputHelp)');
+  }
+}
+
+/**
+ * Scan arguments and increment port number for inspect calls (to avoid conflicts when spawning new command).
+ *
+ * @param {string[]} args - array of arguments from node.execArgv
+ * @returns {string[]}
+ * @api private
+ */
+
+function incrementNodeInspectorPort(args) {
+  // Testing for these options:
+  //  --inspect[=[host:]port]
+  //  --inspect-brk[=[host:]port]
+  //  --inspect-port=[host:]port
+  return args.map((arg) => {
+    if (!arg.startsWith('--inspect')) {
+      return arg;
+    }
+    let debugOption;
+    let debugHost = '127.0.0.1';
+    let debugPort = '9229';
+    let match;
+    if ((match = arg.match(/^(--inspect(-brk)?)$/)) !== null) {
+      // e.g. --inspect
+      debugOption = match[1];
+    } else if ((match = arg.match(/^(--inspect(-brk|-port)?)=([^:]+)$/)) !== null) {
+      debugOption = match[1];
+      if (/^\d+$/.test(match[3])) {
+        // e.g. --inspect=1234
+        debugPort = match[3];
+      } else {
+        // e.g. --inspect=localhost
+        debugHost = match[3];
+      }
+    } else if ((match = arg.match(/^(--inspect(-brk|-port)?)=([^:]+):(\d+)$/)) !== null) {
+      // e.g. --inspect=localhost:1234
+      debugOption = match[1];
+      debugHost = match[3];
+      debugPort = match[4];
+    }
+
+    if (debugOption && debugPort !== '0') {
+      return `${debugOption}=${debugHost}:${parseInt(debugPort) + 1}`;
+    }
+    return arg;
+  });
+}
+
+/**
+ * @param {Command} startCommand
+ * @returns {Command[]}
+ * @api private
+ */
+
+function getCommandAndParents(startCommand) {
+  const result = [];
+  for (let command = startCommand; command; command = command.parent) {
+    result.push(command);
+  }
+  return result;
+}
+
+exports.Command = Command;
Index: frontend/node_modules/commander/lib/error.js
===================================================================
--- frontend/node_modules/commander/lib/error.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/lib/error.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,45 @@
+// @ts-check
+
+/**
+ * CommanderError class
+ * @class
+ */
+class CommanderError extends Error {
+  /**
+   * Constructs the CommanderError class
+   * @param {number} exitCode suggested exit code which could be used with process.exit
+   * @param {string} code an id string representing the error
+   * @param {string} message human-readable description of the error
+   * @constructor
+   */
+  constructor(exitCode, code, message) {
+    super(message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+    this.code = code;
+    this.exitCode = exitCode;
+    this.nestedError = undefined;
+  }
+}
+
+/**
+ * InvalidArgumentError class
+ * @class
+ */
+class InvalidArgumentError extends CommanderError {
+  /**
+   * Constructs the InvalidArgumentError class
+   * @param {string} [message] explanation of why argument is invalid
+   * @constructor
+   */
+  constructor(message) {
+    super(1, 'commander.invalidArgument', message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+  }
+}
+
+exports.CommanderError = CommanderError;
+exports.InvalidArgumentError = InvalidArgumentError;
Index: frontend/node_modules/commander/lib/help.js
===================================================================
--- frontend/node_modules/commander/lib/help.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/lib/help.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,396 @@
+const { humanReadableArgName } = require('./argument.js');
+
+/**
+ * TypeScript import types for JSDoc, used by Visual Studio Code IntelliSense and `npm run typescript-checkJS`
+ * https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html#import-types
+ * @typedef { import("./argument.js").Argument } Argument
+ * @typedef { import("./command.js").Command } Command
+ * @typedef { import("./option.js").Option } Option
+ */
+
+// @ts-check
+
+// Although this is a class, methods are static in style to allow override using subclass or just functions.
+class Help {
+  constructor() {
+    this.helpWidth = undefined;
+    this.sortSubcommands = false;
+    this.sortOptions = false;
+  }
+
+  /**
+   * Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one.
+   *
+   * @param {Command} cmd
+   * @returns {Command[]}
+   */
+
+  visibleCommands(cmd) {
+    const visibleCommands = cmd.commands.filter(cmd => !cmd._hidden);
+    if (cmd._hasImplicitHelpCommand()) {
+      // Create a command matching the implicit help command.
+      const [, helpName, helpArgs] = cmd._helpCommandnameAndArgs.match(/([^ ]+) *(.*)/);
+      const helpCommand = cmd.createCommand(helpName)
+        .helpOption(false);
+      helpCommand.description(cmd._helpCommandDescription);
+      if (helpArgs) helpCommand.arguments(helpArgs);
+      visibleCommands.push(helpCommand);
+    }
+    if (this.sortSubcommands) {
+      visibleCommands.sort((a, b) => {
+        // @ts-ignore: overloaded return type
+        return a.name().localeCompare(b.name());
+      });
+    }
+    return visibleCommands;
+  }
+
+  /**
+   * Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one.
+   *
+   * @param {Command} cmd
+   * @returns {Option[]}
+   */
+
+  visibleOptions(cmd) {
+    const visibleOptions = cmd.options.filter((option) => !option.hidden);
+    // Implicit help
+    const showShortHelpFlag = cmd._hasHelpOption && cmd._helpShortFlag && !cmd._findOption(cmd._helpShortFlag);
+    const showLongHelpFlag = cmd._hasHelpOption && !cmd._findOption(cmd._helpLongFlag);
+    if (showShortHelpFlag || showLongHelpFlag) {
+      let helpOption;
+      if (!showShortHelpFlag) {
+        helpOption = cmd.createOption(cmd._helpLongFlag, cmd._helpDescription);
+      } else if (!showLongHelpFlag) {
+        helpOption = cmd.createOption(cmd._helpShortFlag, cmd._helpDescription);
+      } else {
+        helpOption = cmd.createOption(cmd._helpFlags, cmd._helpDescription);
+      }
+      visibleOptions.push(helpOption);
+    }
+    if (this.sortOptions) {
+      const getSortKey = (option) => {
+        // WYSIWYG for order displayed in help with short before long, no special handling for negated.
+        return option.short ? option.short.replace(/^-/, '') : option.long.replace(/^--/, '');
+      };
+      visibleOptions.sort((a, b) => {
+        return getSortKey(a).localeCompare(getSortKey(b));
+      });
+    }
+    return visibleOptions;
+  }
+
+  /**
+   * Get an array of the arguments if any have a description.
+   *
+   * @param {Command} cmd
+   * @returns {Argument[]}
+   */
+
+  visibleArguments(cmd) {
+    // Side effect! Apply the legacy descriptions before the arguments are displayed.
+    if (cmd._argsDescription) {
+      cmd._args.forEach(argument => {
+        argument.description = argument.description || cmd._argsDescription[argument.name()] || '';
+      });
+    }
+
+    // If there are any arguments with a description then return all the arguments.
+    if (cmd._args.find(argument => argument.description)) {
+      return cmd._args;
+    };
+    return [];
+  }
+
+  /**
+   * Get the command term to show in the list of subcommands.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandTerm(cmd) {
+    // Legacy. Ignores custom usage string, and nested commands.
+    const args = cmd._args.map(arg => humanReadableArgName(arg)).join(' ');
+    return cmd._name +
+      (cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
+      (cmd.options.length ? ' [options]' : '') + // simplistic check for non-help option
+      (args ? ' ' + args : '');
+  }
+
+  /**
+   * Get the option term to show in the list of options.
+   *
+   * @param {Option} option
+   * @returns {string}
+   */
+
+  optionTerm(option) {
+    return option.flags;
+  }
+
+  /**
+   * Get the argument term to show in the list of arguments.
+   *
+   * @param {Argument} argument
+   * @returns {string}
+   */
+
+  argumentTerm(argument) {
+    return argument.name();
+  }
+
+  /**
+   * Get the longest command term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestSubcommandTermLength(cmd, helper) {
+    return helper.visibleCommands(cmd).reduce((max, command) => {
+      return Math.max(max, helper.subcommandTerm(command).length);
+    }, 0);
+  };
+
+  /**
+   * Get the longest option term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestOptionTermLength(cmd, helper) {
+    return helper.visibleOptions(cmd).reduce((max, option) => {
+      return Math.max(max, helper.optionTerm(option).length);
+    }, 0);
+  };
+
+  /**
+   * Get the longest argument term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestArgumentTermLength(cmd, helper) {
+    return helper.visibleArguments(cmd).reduce((max, argument) => {
+      return Math.max(max, helper.argumentTerm(argument).length);
+    }, 0);
+  };
+
+  /**
+   * Get the command usage to be displayed at the top of the built-in help.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandUsage(cmd) {
+    // Usage
+    let cmdName = cmd._name;
+    if (cmd._aliases[0]) {
+      cmdName = cmdName + '|' + cmd._aliases[0];
+    }
+    let parentCmdNames = '';
+    for (let parentCmd = cmd.parent; parentCmd; parentCmd = parentCmd.parent) {
+      parentCmdNames = parentCmd.name() + ' ' + parentCmdNames;
+    }
+    return parentCmdNames + cmdName + ' ' + cmd.usage();
+  }
+
+  /**
+   * Get the description for the command.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandDescription(cmd) {
+    // @ts-ignore: overloaded return type
+    return cmd.description();
+  }
+
+  /**
+   * Get the command description to show in the list of subcommands.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandDescription(cmd) {
+    // @ts-ignore: overloaded return type
+    return cmd.description();
+  }
+
+  /**
+   * Get the option description to show in the list of options.
+   *
+   * @param {Option} option
+   * @return {string}
+   */
+
+  optionDescription(option) {
+    const extraInfo = [];
+    // Some of these do not make sense for negated boolean and suppress for backwards compatibility.
+
+    if (option.argChoices && !option.negate) {
+      extraInfo.push(
+        // use stringify to match the display of the default value
+        `choices: ${option.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
+    }
+    if (option.defaultValue !== undefined && !option.negate) {
+      extraInfo.push(`default: ${option.defaultValueDescription || JSON.stringify(option.defaultValue)}`);
+    }
+    if (option.envVar !== undefined) {
+      extraInfo.push(`env: ${option.envVar}`);
+    }
+    if (extraInfo.length > 0) {
+      return `${option.description} (${extraInfo.join(', ')})`;
+    }
+
+    return option.description;
+  };
+
+  /**
+   * Get the argument description to show in the list of arguments.
+   *
+   * @param {Argument} argument
+   * @return {string}
+   */
+
+  argumentDescription(argument) {
+    const extraInfo = [];
+    if (argument.argChoices) {
+      extraInfo.push(
+        // use stringify to match the display of the default value
+        `choices: ${argument.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
+    }
+    if (argument.defaultValue !== undefined) {
+      extraInfo.push(`default: ${argument.defaultValueDescription || JSON.stringify(argument.defaultValue)}`);
+    }
+    if (extraInfo.length > 0) {
+      const extraDescripton = `(${extraInfo.join(', ')})`;
+      if (argument.description) {
+        return `${argument.description} ${extraDescripton}`;
+      }
+      return extraDescripton;
+    }
+    return argument.description;
+  }
+
+  /**
+   * Generate the built-in help text.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {string}
+   */
+
+  formatHelp(cmd, helper) {
+    const termWidth = helper.padWidth(cmd, helper);
+    const helpWidth = helper.helpWidth || 80;
+    const itemIndentWidth = 2;
+    const itemSeparatorWidth = 2; // between term and description
+    function formatItem(term, description) {
+      if (description) {
+        const fullText = `${term.padEnd(termWidth + itemSeparatorWidth)}${description}`;
+        return helper.wrap(fullText, helpWidth - itemIndentWidth, termWidth + itemSeparatorWidth);
+      }
+      return term;
+    };
+    function formatList(textArray) {
+      return textArray.join('\n').replace(/^/gm, ' '.repeat(itemIndentWidth));
+    }
+
+    // Usage
+    let output = [`Usage: ${helper.commandUsage(cmd)}`, ''];
+
+    // Description
+    const commandDescription = helper.commandDescription(cmd);
+    if (commandDescription.length > 0) {
+      output = output.concat([commandDescription, '']);
+    }
+
+    // Arguments
+    const argumentList = helper.visibleArguments(cmd).map((argument) => {
+      return formatItem(helper.argumentTerm(argument), helper.argumentDescription(argument));
+    });
+    if (argumentList.length > 0) {
+      output = output.concat(['Arguments:', formatList(argumentList), '']);
+    }
+
+    // Options
+    const optionList = helper.visibleOptions(cmd).map((option) => {
+      return formatItem(helper.optionTerm(option), helper.optionDescription(option));
+    });
+    if (optionList.length > 0) {
+      output = output.concat(['Options:', formatList(optionList), '']);
+    }
+
+    // Commands
+    const commandList = helper.visibleCommands(cmd).map((cmd) => {
+      return formatItem(helper.subcommandTerm(cmd), helper.subcommandDescription(cmd));
+    });
+    if (commandList.length > 0) {
+      output = output.concat(['Commands:', formatList(commandList), '']);
+    }
+
+    return output.join('\n');
+  }
+
+  /**
+   * Calculate the pad width from the maximum term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  padWidth(cmd, helper) {
+    return Math.max(
+      helper.longestOptionTermLength(cmd, helper),
+      helper.longestSubcommandTermLength(cmd, helper),
+      helper.longestArgumentTermLength(cmd, helper)
+    );
+  };
+
+  /**
+   * Wrap the given string to width characters per line, with lines after the first indented.
+   * Do not wrap if insufficient room for wrapping (minColumnWidth), or string is manually formatted.
+   *
+   * @param {string} str
+   * @param {number} width
+   * @param {number} indent
+   * @param {number} [minColumnWidth=40]
+   * @return {string}
+   *
+   */
+
+  wrap(str, width, indent, minColumnWidth = 40) {
+    // Detect manually wrapped and indented strings by searching for line breaks
+    // followed by multiple spaces/tabs.
+    if (str.match(/[\n]\s+/)) return str;
+    // Do not wrap if not enough room for a wrapped column of text (as could end up with a word per line).
+    const columnWidth = width - indent;
+    if (columnWidth < minColumnWidth) return str;
+
+    const leadingStr = str.substr(0, indent);
+    const columnText = str.substr(indent);
+
+    const indentString = ' '.repeat(indent);
+    const regex = new RegExp('.{1,' + (columnWidth - 1) + '}([\\s\u200B]|$)|[^\\s\u200B]+?([\\s\u200B]|$)', 'g');
+    const lines = columnText.match(regex) || [];
+    return leadingStr + lines.map((line, i) => {
+      if (line.slice(-1) === '\n') {
+        line = line.slice(0, line.length - 1);
+      }
+      return ((i > 0) ? indentString : '') + line.trimRight();
+    }).join('\n');
+  }
+}
+
+exports.Help = Help;
Index: frontend/node_modules/commander/lib/option.js
===================================================================
--- frontend/node_modules/commander/lib/option.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/lib/option.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,208 @@
+const { InvalidArgumentError } = require('./error.js');
+
+// @ts-check
+
+class Option {
+  /**
+   * Initialize a new `Option` with the given `flags` and `description`.
+   *
+   * @param {string} flags
+   * @param {string} [description]
+   */
+
+  constructor(flags, description) {
+    this.flags = flags;
+    this.description = description || '';
+
+    this.required = flags.includes('<'); // A value must be supplied when the option is specified.
+    this.optional = flags.includes('['); // A value is optional when the option is specified.
+    // variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
+    this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
+    this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
+    const optionFlags = splitOptionFlags(flags);
+    this.short = optionFlags.shortFlag;
+    this.long = optionFlags.longFlag;
+    this.negate = false;
+    if (this.long) {
+      this.negate = this.long.startsWith('--no-');
+    }
+    this.defaultValue = undefined;
+    this.defaultValueDescription = undefined;
+    this.envVar = undefined;
+    this.parseArg = undefined;
+    this.hidden = false;
+    this.argChoices = undefined;
+  }
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   *
+   * @param {any} value
+   * @param {string} [description]
+   * @return {Option}
+   */
+
+  default(value, description) {
+    this.defaultValue = value;
+    this.defaultValueDescription = description;
+    return this;
+  };
+
+  /**
+   * Set environment variable to check for option value.
+   * Priority order of option values is default < env < cli
+   *
+   * @param {string} name
+   * @return {Option}
+   */
+
+  env(name) {
+    this.envVar = name;
+    return this;
+  };
+
+  /**
+   * Set the custom handler for processing CLI option arguments into option values.
+   *
+   * @param {Function} [fn]
+   * @return {Option}
+   */
+
+  argParser(fn) {
+    this.parseArg = fn;
+    return this;
+  };
+
+  /**
+   * Whether the option is mandatory and must have a value after parsing.
+   *
+   * @param {boolean} [mandatory=true]
+   * @return {Option}
+   */
+
+  makeOptionMandatory(mandatory = true) {
+    this.mandatory = !!mandatory;
+    return this;
+  };
+
+  /**
+   * Hide option in help.
+   *
+   * @param {boolean} [hide=true]
+   * @return {Option}
+   */
+
+  hideHelp(hide = true) {
+    this.hidden = !!hide;
+    return this;
+  };
+
+  /**
+   * @api private
+   */
+
+  _concatValue(value, previous) {
+    if (previous === this.defaultValue || !Array.isArray(previous)) {
+      return [value];
+    }
+
+    return previous.concat(value);
+  }
+
+  /**
+   * Only allow option value to be one of choices.
+   *
+   * @param {string[]} values
+   * @return {Option}
+   */
+
+  choices(values) {
+    this.argChoices = values;
+    this.parseArg = (arg, previous) => {
+      if (!values.includes(arg)) {
+        throw new InvalidArgumentError(`Allowed choices are ${values.join(', ')}.`);
+      }
+      if (this.variadic) {
+        return this._concatValue(arg, previous);
+      }
+      return arg;
+    };
+    return this;
+  };
+
+  /**
+   * Return option name.
+   *
+   * @return {string}
+   */
+
+  name() {
+    if (this.long) {
+      return this.long.replace(/^--/, '');
+    }
+    return this.short.replace(/^-/, '');
+  };
+
+  /**
+   * Return option name, in a camelcase format that can be used
+   * as a object attribute key.
+   *
+   * @return {string}
+   * @api private
+   */
+
+  attributeName() {
+    return camelcase(this.name().replace(/^no-/, ''));
+  };
+
+  /**
+   * Check if `arg` matches the short or long flag.
+   *
+   * @param {string} arg
+   * @return {boolean}
+   * @api private
+   */
+
+  is(arg) {
+    return this.short === arg || this.long === arg;
+  };
+}
+
+/**
+ * Convert string from kebab-case to camelCase.
+ *
+ * @param {string} str
+ * @return {string}
+ * @api private
+ */
+
+function camelcase(str) {
+  return str.split('-').reduce((str, word) => {
+    return str + word[0].toUpperCase() + word.slice(1);
+  });
+}
+
+/**
+ * Split the short and long flag out of something like '-m,--mixed <value>'
+ *
+ * @api private
+ */
+
+function splitOptionFlags(flags) {
+  let shortFlag;
+  let longFlag;
+  // Use original very loose parsing to maintain backwards compatibility for now,
+  // which allowed for example unintended `-sw, --short-word` [sic].
+  const flagParts = flags.split(/[ |,]+/);
+  if (flagParts.length > 1 && !/^[[<]/.test(flagParts[1])) shortFlag = flagParts.shift();
+  longFlag = flagParts.shift();
+  // Add support for lone short flag without significantly changing parsing!
+  if (!shortFlag && /^-[^-]$/.test(longFlag)) {
+    shortFlag = longFlag;
+    longFlag = undefined;
+  }
+  return { shortFlag, longFlag };
+}
+
+exports.Option = Option;
+exports.splitOptionFlags = splitOptionFlags;
Index: frontend/node_modules/commander/lib/suggestSimilar.js
===================================================================
--- frontend/node_modules/commander/lib/suggestSimilar.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/lib/suggestSimilar.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,100 @@
+const maxDistance = 3;
+
+function editDistance(a, b) {
+  // https://en.wikipedia.org/wiki/Damerau–Levenshtein_distance
+  // Calculating optimal string alignment distance, no substring is edited more than once.
+  // (Simple implementation.)
+
+  // Quick early exit, return worst case.
+  if (Math.abs(a.length - b.length) > maxDistance) return Math.max(a.length, b.length);
+
+  // distance between prefix substrings of a and b
+  const d = [];
+
+  // pure deletions turn a into empty string
+  for (let i = 0; i <= a.length; i++) {
+    d[i] = [i];
+  }
+  // pure insertions turn empty string into b
+  for (let j = 0; j <= b.length; j++) {
+    d[0][j] = j;
+  }
+
+  // fill matrix
+  for (let j = 1; j <= b.length; j++) {
+    for (let i = 1; i <= a.length; i++) {
+      let cost = 1;
+      if (a[i - 1] === b[j - 1]) {
+        cost = 0;
+      } else {
+        cost = 1;
+      }
+      d[i][j] = Math.min(
+        d[i - 1][j] + 1, // deletion
+        d[i][j - 1] + 1, // insertion
+        d[i - 1][j - 1] + cost // substitution
+      );
+      // transposition
+      if (i > 1 && j > 1 && a[i - 1] === b[j - 2] && a[i - 2] === b[j - 1]) {
+        d[i][j] = Math.min(d[i][j], d[i - 2][j - 2] + 1);
+      }
+    }
+  }
+
+  return d[a.length][b.length];
+}
+
+/**
+ * Find close matches, restricted to same number of edits.
+ *
+ * @param {string} word
+ * @param {string[]} candidates
+ * @returns {string}
+ */
+
+function suggestSimilar(word, candidates) {
+  if (!candidates || candidates.length === 0) return '';
+  // remove possible duplicates
+  candidates = Array.from(new Set(candidates));
+
+  const searchingOptions = word.startsWith('--');
+  if (searchingOptions) {
+    word = word.slice(2);
+    candidates = candidates.map(candidate => candidate.slice(2));
+  }
+
+  let similar = [];
+  let bestDistance = maxDistance;
+  const minSimilarity = 0.4;
+  candidates.forEach((candidate) => {
+    if (candidate.length <= 1) return; // no one character guesses
+
+    const distance = editDistance(word, candidate);
+    const length = Math.max(word.length, candidate.length);
+    const similarity = (length - distance) / length;
+    if (similarity > minSimilarity) {
+      if (distance < bestDistance) {
+        // better edit distance, throw away previous worse matches
+        bestDistance = distance;
+        similar = [candidate];
+      } else if (distance === bestDistance) {
+        similar.push(candidate);
+      }
+    }
+  });
+
+  similar.sort((a, b) => a.localeCompare(b));
+  if (searchingOptions) {
+    similar = similar.map(candidate => `--${candidate}`);
+  }
+
+  if (similar.length > 1) {
+    return `\n(Did you mean one of ${similar.join(', ')}?)`;
+  }
+  if (similar.length === 1) {
+    return `\n(Did you mean ${similar[0]}?)`;
+  }
+  return '';
+}
+
+exports.suggestSimilar = suggestSimilar;
Index: frontend/node_modules/commander/package-support.json
===================================================================
--- frontend/node_modules/commander/package-support.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/package-support.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,16 @@
+{
+  "versions": [
+    {
+      "version": "*",
+      "target": {
+        "node": "supported"
+      },
+      "response": {
+        "type": "time-permitting"
+      },
+      "backing": {
+        "npm-funding": true
+      }
+    }
+  ]
+}
Index: frontend/node_modules/commander/package.json
===================================================================
--- frontend/node_modules/commander/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,69 @@
+{
+  "name": "commander",
+  "version": "8.3.0",
+  "description": "the complete solution for node.js command-line programs",
+  "keywords": [
+    "commander",
+    "command",
+    "option",
+    "parser",
+    "cli",
+    "argument",
+    "args",
+    "argv"
+  ],
+  "author": "TJ Holowaychuk <tj@vision-media.ca>",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/tj/commander.js.git"
+  },
+  "scripts": {
+    "lint": "eslint index.js esm.mjs \"lib/*.js\" \"tests/**/*.js\"",
+    "typescript-lint": "eslint typings/*.ts tests/*.ts",
+    "test": "jest && npm run test-typings",
+    "test-esm": "node --experimental-modules ./tests/esm-imports-test.mjs",
+    "test-typings": "tsd",
+    "typescript-checkJS": "tsc --allowJS --checkJS index.js lib/*.js --noEmit",
+    "test-all": "npm run test && npm run lint && npm run typescript-lint && npm run typescript-checkJS && npm run test-esm"
+  },
+  "main": "./index.js",
+  "files": [
+    "index.js",
+    "lib/*.js",
+    "esm.mjs",
+    "typings/index.d.ts",
+    "package-support.json"
+  ],
+  "type": "commonjs",
+  "dependencies": {},
+  "devDependencies": {
+    "@types/jest": "^26.0.23",
+    "@types/node": "^14.17.3",
+    "@typescript-eslint/eslint-plugin": "^4.27.0",
+    "@typescript-eslint/parser": "^4.27.0",
+    "eslint": "^7.29.0",
+    "eslint-config-standard": "^16.0.3",
+    "eslint-plugin-jest": "^24.3.6",
+    "jest": "^27.0.4",
+    "standard": "^16.0.3",
+    "ts-jest": "^27.0.3",
+    "tsd": "^0.17.0",
+    "typescript": "^4.3.4"
+  },
+  "types": "typings/index.d.ts",
+  "jest": {
+    "testEnvironment": "node",
+    "collectCoverage": true,
+    "transform": {
+      "^.+\\.tsx?$": "ts-jest"
+    },
+    "testPathIgnorePatterns": [
+      "/node_modules/"
+    ]
+  },
+  "engines": {
+    "node": ">= 12"
+  },
+  "support": true
+}
Index: frontend/node_modules/commander/typings/index.d.ts
===================================================================
--- frontend/node_modules/commander/typings/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commander/typings/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,774 @@
+// Type definitions for commander
+// Original definitions by: Alan Agius <https://github.com/alan-agius4>, Marcelo Dezem <https://github.com/mdezem>, vvakame <https://github.com/vvakame>, Jules Randolph <https://github.com/sveinburne>
+
+// Using method rather than property for method-signature-style, to document method overloads separately. Allow either.
+/* eslint-disable @typescript-eslint/method-signature-style */
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+export class CommanderError extends Error {
+  code: string;
+  exitCode: number;
+  message: string;
+  nestedError?: string;
+
+  /**
+   * Constructs the CommanderError class
+   * @param exitCode - suggested exit code which could be used with process.exit
+   * @param code - an id string representing the error
+   * @param message - human-readable description of the error
+   * @constructor
+   */
+  constructor(exitCode: number, code: string, message: string);
+}
+
+export class InvalidArgumentError extends CommanderError {
+  /**
+   * Constructs the InvalidArgumentError class
+   * @param message - explanation of why argument is invalid
+   * @constructor
+   */
+  constructor(message: string);
+}
+export { InvalidArgumentError as InvalidOptionArgumentError }; // deprecated old name
+
+export class Argument {
+  description: string;
+  required: boolean;
+  variadic: boolean;
+
+  /**
+   * Initialize a new command argument with the given name and description.
+   * The default is that the argument is required, and you can explicitly
+   * indicate this with <> around the name. Put [] around the name for an optional argument.
+   */
+  constructor(arg: string, description?: string);
+
+  /**
+   * Return argument name.
+   */
+  name(): string;
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   */
+  default(value: unknown, description?: string): this;
+
+  /**
+   * Set the custom handler for processing CLI command arguments into argument values.
+   */
+  argParser<T>(fn: (value: string, previous: T) => T): this;
+
+  /**
+   * Only allow argument value to be one of choices.
+   */
+  choices(values: string[]): this;
+
+  /**
+   * Make option-argument required.
+   */
+  argRequired(): this;
+
+  /**
+   * Make option-argument optional.
+   */
+  argOptional(): this;
+  }
+
+export class Option {
+  flags: string;
+  description: string;
+
+  required: boolean; // A value must be supplied when the option is specified.
+  optional: boolean; // A value is optional when the option is specified.
+  variadic: boolean;
+  mandatory: boolean; // The option must have a value after parsing, which usually means it must be specified on command line.
+  optionFlags: string;
+  short?: string;
+  long?: string;
+  negate: boolean;
+  defaultValue?: any;
+  defaultValueDescription?: string;
+  parseArg?: <T>(value: string, previous: T) => T;
+  hidden: boolean;
+  argChoices?: string[];
+
+  constructor(flags: string, description?: string);
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   */
+  default(value: unknown, description?: string): this;
+
+  /**
+   * Set environment variable to check for option value.
+   * Priority order of option values is default < env < cli
+   */
+  env(name: string): this;
+
+  /**
+   * Calculate the full description, including defaultValue etc.
+   */
+  fullDescription(): string;
+
+  /**
+   * Set the custom handler for processing CLI option arguments into option values.
+   */
+  argParser<T>(fn: (value: string, previous: T) => T): this;
+
+  /**
+   * Whether the option is mandatory and must have a value after parsing.
+   */
+  makeOptionMandatory(mandatory?: boolean): this;
+
+  /**
+   * Hide option in help.
+   */
+  hideHelp(hide?: boolean): this;
+
+  /**
+   * Only allow option value to be one of choices.
+   */
+  choices(values: string[]): this;
+
+  /**
+   * Return option name.
+   */
+  name(): string;
+
+  /**
+   * Return option name, in a camelcase format that can be used
+   * as a object attribute key.
+   */
+  attributeName(): string;
+}
+
+export class Help {
+  /** output helpWidth, long lines are wrapped to fit */
+  helpWidth?: number;
+  sortSubcommands: boolean;
+  sortOptions: boolean;
+
+  constructor();
+
+  /** Get the command term to show in the list of subcommands. */
+  subcommandTerm(cmd: Command): string;
+  /** Get the command description to show in the list of subcommands. */
+  subcommandDescription(cmd: Command): string;
+  /** Get the option term to show in the list of options. */
+  optionTerm(option: Option): string;
+  /** Get the option description to show in the list of options. */
+  optionDescription(option: Option): string;
+  /** Get the argument term to show in the list of arguments. */
+  argumentTerm(argument: Argument): string;
+  /** Get the argument description to show in the list of arguments. */
+  argumentDescription(argument: Argument): string;
+
+  /** Get the command usage to be displayed at the top of the built-in help. */
+  commandUsage(cmd: Command): string;
+  /** Get the description for the command. */
+  commandDescription(cmd: Command): string;
+
+  /** Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one. */
+  visibleCommands(cmd: Command): Command[];
+  /** Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one. */
+  visibleOptions(cmd: Command): Option[];
+  /** Get an array of the arguments which have descriptions. */
+  visibleArguments(cmd: Command): Argument[];
+
+  /** Get the longest command term length. */
+  longestSubcommandTermLength(cmd: Command, helper: Help): number;
+  /** Get the longest option term length. */
+  longestOptionTermLength(cmd: Command, helper: Help): number;
+  /** Get the longest argument term length. */
+  longestArgumentTermLength(cmd: Command, helper: Help): number;
+  /** Calculate the pad width from the maximum term length. */
+  padWidth(cmd: Command, helper: Help): number;
+
+  /**
+   * Wrap the given string to width characters per line, with lines after the first indented.
+   * Do not wrap if insufficient room for wrapping (minColumnWidth), or string is manually formatted.
+   */
+  wrap(str: string, width: number, indent: number, minColumnWidth?: number): string;
+
+  /** Generate the built-in help text. */
+  formatHelp(cmd: Command, helper: Help): string;
+}
+export type HelpConfiguration = Partial<Help>;
+
+export interface ParseOptions {
+  from: 'node' | 'electron' | 'user';
+}
+export interface HelpContext { // optional parameter for .help() and .outputHelp()
+  error: boolean;
+}
+export interface AddHelpTextContext { // passed to text function used with .addHelpText()
+  error: boolean;
+  command: Command;
+}
+export interface OutputConfiguration {
+  writeOut?(str: string): void;
+  writeErr?(str: string): void;
+  getOutHelpWidth?(): number;
+  getErrHelpWidth?(): number;
+  outputError?(str: string, write: (str: string) => void): void;
+
+}
+
+export type AddHelpTextPosition = 'beforeAll' | 'before' | 'after' | 'afterAll';
+export type HookEvent = 'preAction' | 'postAction';
+export type OptionValueSource = 'default' | 'env' | 'config' | 'cli';
+
+export interface OptionValues {
+  [key: string]: any;
+}
+
+export class Command {
+  args: string[];
+  processedArgs: any[];
+  commands: Command[];
+  parent: Command | null;
+
+  constructor(name?: string);
+
+  /**
+   * Set the program version to `str`.
+   *
+   * This method auto-registers the "-V, --version" flag
+   * which will print the version number when passed.
+   *
+   * You can optionally supply the  flags and description to override the defaults.
+   */
+  version(str: string, flags?: string, description?: string): this;
+
+  /**
+   * Define a command, implemented using an action handler.
+   *
+   * @remarks
+   * The command description is supplied using `.description`, not as a parameter to `.command`.
+   *
+   * @example
+   * ```ts
+   * program
+   *   .command('clone <source> [destination]')
+   *   .description('clone a repository into a newly created directory')
+   *   .action((source, destination) => {
+   *     console.log('clone command called');
+   *   });
+   * ```
+   *
+   * @param nameAndArgs - command name and arguments, args are  `<required>` or `[optional]` and last may also be `variadic...`
+   * @param opts - configuration options
+   * @returns new command
+   */
+  command(nameAndArgs: string, opts?: CommandOptions): ReturnType<this['createCommand']>;
+  /**
+   * Define a command, implemented in a separate executable file.
+   *
+   * @remarks
+   * The command description is supplied as the second parameter to `.command`.
+   *
+   * @example
+   * ```ts
+   *  program
+   *    .command('start <service>', 'start named service')
+   *    .command('stop [service]', 'stop named service, or all if no name supplied');
+   * ```
+   *
+   * @param nameAndArgs - command name and arguments, args are  `<required>` or `[optional]` and last may also be `variadic...`
+   * @param description - description of executable command
+   * @param opts - configuration options
+   * @returns `this` command for chaining
+   */
+  command(nameAndArgs: string, description: string, opts?: ExecutableCommandOptions): this;
+
+  /**
+   * Factory routine to create a new unattached command.
+   *
+   * See .command() for creating an attached subcommand, which uses this routine to
+   * create the command. You can override createCommand to customise subcommands.
+   */
+  createCommand(name?: string): Command;
+
+  /**
+   * Add a prepared subcommand.
+   *
+   * See .command() for creating an attached subcommand which inherits settings from its parent.
+   *
+   * @returns `this` command for chaining
+   */
+  addCommand(cmd: Command, opts?: CommandOptions): this;
+
+  /**
+   * Factory routine to create a new unattached argument.
+   *
+   * See .argument() for creating an attached argument, which uses this routine to
+   * create the argument. You can override createArgument to return a custom argument.
+   */
+  createArgument(name: string, description?: string): Argument;
+
+  /**
+   * Define argument syntax for command.
+   *
+   * The default is that the argument is required, and you can explicitly
+   * indicate this with <> around the name. Put [] around the name for an optional argument.
+   *
+   * @example
+   * ```
+   * program.argument('<input-file>');
+   * program.argument('[output-file]');
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+    argument<T>(flags: string, description: string, fn: (value: string, previous: T) => T, defaultValue?: T): this;
+    argument(name: string, description?: string, defaultValue?: unknown): this;
+
+  /**
+   * Define argument syntax for command, adding a prepared argument.
+   *
+   * @returns `this` command for chaining
+   */
+  addArgument(arg: Argument): this;
+
+  /**
+   * Define argument syntax for command, adding multiple at once (without descriptions).
+   *
+   * See also .argument().
+   *
+   * @example
+   * ```
+   * program.arguments('<cmd> [env]');
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+  arguments(names: string): this;
+
+  /**
+   * Override default decision whether to add implicit help command.
+   *
+   * @example
+   * ```
+   * addHelpCommand() // force on
+   * addHelpCommand(false); // force off
+   * addHelpCommand('help [cmd]', 'display help for [cmd]'); // force on with custom details
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+  addHelpCommand(enableOrNameAndArgs?: string | boolean, description?: string): this;
+
+  /**
+   * Add hook for life cycle event.
+   */
+  hook(event: HookEvent, listener: (thisCommand: Command, actionCommand: Command) => void | Promise<void>): this;
+
+  /**
+   * Register callback to use as replacement for calling process.exit.
+   */
+  exitOverride(callback?: (err: CommanderError) => never|void): this;
+
+  /**
+   * You can customise the help with a subclass of Help by overriding createHelp,
+   * or by overriding Help properties using configureHelp().
+   */
+  createHelp(): Help;
+
+  /**
+   * You can customise the help by overriding Help properties using configureHelp(),
+   * or with a subclass of Help by overriding createHelp().
+   */
+  configureHelp(configuration: HelpConfiguration): this;
+  /** Get configuration */
+  configureHelp(): HelpConfiguration;
+
+  /**
+   * The default output goes to stdout and stderr. You can customise this for special
+   * applications. You can also customise the display of errors by overriding outputError.
+   *
+   * The configuration properties are all functions:
+   * ```
+   * // functions to change where being written, stdout and stderr
+   * writeOut(str)
+   * writeErr(str)
+   * // matching functions to specify width for wrapping help
+   * getOutHelpWidth()
+   * getErrHelpWidth()
+   * // functions based on what is being written out
+   * outputError(str, write) // used for displaying errors, and not used for displaying help
+   * ```
+   */
+  configureOutput(configuration: OutputConfiguration): this;
+  /** Get configuration */
+  configureOutput(): OutputConfiguration;
+
+  /**
+   * Copy settings that are useful to have in common across root command and subcommands.
+   *
+   * (Used internally when adding a command using `.command()` so subcommands inherit parent settings.)
+   */
+  copyInheritedSettings(sourceCommand: Command): this;
+
+  /**
+   * Display the help or a custom message after an error occurs.
+   */
+  showHelpAfterError(displayHelp?: boolean | string): this;
+
+  /**
+   * Display suggestion of similar commands for unknown commands, or options for unknown options.
+   */
+  showSuggestionAfterError(displaySuggestion?: boolean): this;
+
+   /**
+   * Register callback `fn` for the command.
+   *
+   * @example
+   * ```
+   * program
+   *   .command('serve')
+   *   .description('start service')
+   *   .action(function() {
+   *     // do work here
+   *   });
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+  action(fn: (...args: any[]) => void | Promise<void>): this;
+
+  /**
+   * Define option with `flags`, `description` and optional
+   * coercion `fn`.
+   *
+   * The `flags` string contains the short and/or long flags,
+   * separated by comma, a pipe or space. The following are all valid
+   * all will output this way when `--help` is used.
+   *
+   *     "-p, --pepper"
+   *     "-p|--pepper"
+   *     "-p --pepper"
+   *
+   * @example
+   * ```
+   * // simple boolean defaulting to false
+   *  program.option('-p, --pepper', 'add pepper');
+   *
+   *  --pepper
+   *  program.pepper
+   *  // => Boolean
+   *
+   *  // simple boolean defaulting to true
+   *  program.option('-C, --no-cheese', 'remove cheese');
+   *
+   *  program.cheese
+   *  // => true
+   *
+   *  --no-cheese
+   *  program.cheese
+   *  // => false
+   *
+   *  // required argument
+   *  program.option('-C, --chdir <path>', 'change the working directory');
+   *
+   *  --chdir /tmp
+   *  program.chdir
+   *  // => "/tmp"
+   *
+   *  // optional argument
+   *  program.option('-c, --cheese [type]', 'add cheese [marble]');
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+  option(flags: string, description?: string, defaultValue?: string | boolean): this;
+  option<T>(flags: string, description: string, fn: (value: string, previous: T) => T, defaultValue?: T): this;
+  /** @deprecated since v7, instead use choices or a custom function */
+  option(flags: string, description: string, regexp: RegExp, defaultValue?: string | boolean): this;
+
+  /**
+   * Define a required option, which must have a value after parsing. This usually means
+   * the option must be specified on the command line. (Otherwise the same as .option().)
+   *
+   * The `flags` string contains the short and/or long flags, separated by comma, a pipe or space.
+   */
+  requiredOption(flags: string, description?: string, defaultValue?: string | boolean): this;
+  requiredOption<T>(flags: string, description: string, fn: (value: string, previous: T) => T, defaultValue?: T): this;
+  /** @deprecated since v7, instead use choices or a custom function */
+  requiredOption(flags: string, description: string, regexp: RegExp, defaultValue?: string | boolean): this;
+
+  /**
+   * Factory routine to create a new unattached option.
+   *
+   * See .option() for creating an attached option, which uses this routine to
+   * create the option. You can override createOption to return a custom option.
+   */
+
+  createOption(flags: string, description?: string): Option;
+
+  /**
+   * Add a prepared Option.
+   *
+   * See .option() and .requiredOption() for creating and attaching an option in a single call.
+   */
+  addOption(option: Option): this;
+
+  /**
+   * Whether to store option values as properties on command object,
+   * or store separately (specify false). In both cases the option values can be accessed using .opts().
+   *
+   * @returns `this` command for chaining
+   */
+  storeOptionsAsProperties<T extends OptionValues>(): this & T;
+  storeOptionsAsProperties<T extends OptionValues>(storeAsProperties: true): this & T;
+  storeOptionsAsProperties(storeAsProperties?: boolean): this;
+
+  /**
+   * Retrieve option value.
+   */
+  getOptionValue(key: string): any;
+
+  /**
+   * Store option value.
+   */
+  setOptionValue(key: string, value: unknown): this;
+
+  /**
+   * Store option value and where the value came from.
+   */
+  setOptionValueWithSource(key: string, value: unknown, source: OptionValueSource): this;
+
+  /**
+   * Retrieve option value source.
+   */
+  getOptionValueSource(key: string): OptionValueSource;
+
+   /**
+   * Alter parsing of short flags with optional values.
+   *
+   * @example
+   * ```
+   * // for `.option('-f,--flag [value]'):
+   * .combineFlagAndOptionalValue(true)  // `-f80` is treated like `--flag=80`, this is the default behaviour
+   * .combineFlagAndOptionalValue(false) // `-fb` is treated like `-f -b`
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+  combineFlagAndOptionalValue(combine?: boolean): this;
+
+  /**
+   * Allow unknown options on the command line.
+   *
+   * @returns `this` command for chaining
+   */
+  allowUnknownOption(allowUnknown?: boolean): this;
+
+  /**
+   * Allow excess command-arguments on the command line. Pass false to make excess arguments an error.
+   *
+   * @returns `this` command for chaining
+   */
+  allowExcessArguments(allowExcess?: boolean): this;
+
+  /**
+   * Enable positional options. Positional means global options are specified before subcommands which lets
+   * subcommands reuse the same option names, and also enables subcommands to turn on passThroughOptions.
+   *
+   * The default behaviour is non-positional and global options may appear anywhere on the command line.
+   *
+   * @returns `this` command for chaining
+   */
+  enablePositionalOptions(positional?: boolean): this;
+
+  /**
+   * Pass through options that come after command-arguments rather than treat them as command-options,
+   * so actual command-options come before command-arguments. Turning this on for a subcommand requires
+   * positional options to have been enabled on the program (parent commands).
+   *
+   * The default behaviour is non-positional and options may appear before or after command-arguments.
+   *
+   * @returns `this` command for chaining
+   */
+  passThroughOptions(passThrough?: boolean): this;
+
+  /**
+   * Parse `argv`, setting options and invoking commands when defined.
+   *
+   * The default expectation is that the arguments are from node and have the application as argv[0]
+   * and the script being run in argv[1], with user parameters after that.
+   *
+   * @example
+   * ```
+   * program.parse(process.argv);
+   * program.parse(); // implicitly use process.argv and auto-detect node vs electron conventions
+   * program.parse(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
+   * ```
+   *
+   * @returns `this` command for chaining
+   */
+  parse(argv?: string[], options?: ParseOptions): this;
+
+  /**
+   * Parse `argv`, setting options and invoking commands when defined.
+   *
+   * Use parseAsync instead of parse if any of your action handlers are async. Returns a Promise.
+   *
+   * The default expectation is that the arguments are from node and have the application as argv[0]
+   * and the script being run in argv[1], with user parameters after that.
+   *
+   * @example
+   * ```
+   * program.parseAsync(process.argv);
+   * program.parseAsync(); // implicitly use process.argv and auto-detect node vs electron conventions
+   * program.parseAsync(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
+   * ```
+   *
+   * @returns Promise
+   */
+  parseAsync(argv?: string[], options?: ParseOptions): Promise<this>;
+
+  /**
+   * Parse options from `argv` removing known options,
+   * and return argv split into operands and unknown arguments.
+   *
+   *     argv => operands, unknown
+   *     --known kkk op => [op], []
+   *     op --known kkk => [op], []
+   *     sub --unknown uuu op => [sub], [--unknown uuu op]
+   *     sub -- --unknown uuu op => [sub --unknown uuu op], []
+   */
+  parseOptions(argv: string[]): ParseOptionsResult;
+
+  /**
+   * Return an object containing options as key-value pairs
+   */
+  opts<T extends OptionValues>(): T;
+
+  /**
+   * Set the description.
+   *
+   * @returns `this` command for chaining
+   */
+
+  description(str: string): this;
+  /** @deprecated since v8, instead use .argument to add command argument with description */
+  description(str: string, argsDescription: {[argName: string]: string}): this;
+  /**
+   * Get the description.
+   */
+  description(): string;
+
+  /**
+   * Set an alias for the command.
+   *
+   * You may call more than once to add multiple aliases. Only the first alias is shown in the auto-generated help.
+   *
+   * @returns `this` command for chaining
+   */
+  alias(alias: string): this;
+  /**
+   * Get alias for the command.
+   */
+  alias(): string;
+
+  /**
+   * Set aliases for the command.
+   *
+   * Only the first alias is shown in the auto-generated help.
+   *
+   * @returns `this` command for chaining
+   */
+  aliases(aliases: string[]): this;
+  /**
+   * Get aliases for the command.
+   */
+  aliases(): string[];
+
+  /**
+   * Set the command usage.
+   *
+   * @returns `this` command for chaining
+   */
+  usage(str: string): this;
+  /**
+   * Get the command usage.
+   */
+  usage(): string;
+
+  /**
+   * Set the name of the command.
+   *
+   * @returns `this` command for chaining
+   */
+  name(str: string): this;
+  /**
+   * Get the name of the command.
+   */
+  name(): string;
+
+  /**
+   * Output help information for this command.
+   *
+   * Outputs built-in help, and custom text added using `.addHelpText()`.
+   *
+   */
+  outputHelp(context?: HelpContext): void;
+  /** @deprecated since v7 */
+  outputHelp(cb?: (str: string) => string): void;
+
+  /**
+   * Return command help documentation.
+   */
+  helpInformation(context?: HelpContext): string;
+
+  /**
+   * You can pass in flags and a description to override the help
+   * flags and help description for your command. Pass in false
+   * to disable the built-in help option.
+   */
+  helpOption(flags?: string | boolean, description?: string): this;
+
+  /**
+   * Output help information and exit.
+   *
+   * Outputs built-in help, and custom text added using `.addHelpText()`.
+   */
+  help(context?: HelpContext): never;
+  /** @deprecated since v7 */
+  help(cb?: (str: string) => string): never;
+
+  /**
+   * Add additional text to be displayed with the built-in help.
+   *
+   * Position is 'before' or 'after' to affect just this command,
+   * and 'beforeAll' or 'afterAll' to affect this command and all its subcommands.
+   */
+  addHelpText(position: AddHelpTextPosition, text: string): this;
+  addHelpText(position: AddHelpTextPosition, text: (context: AddHelpTextContext) => string): this;
+
+  /**
+   * Add a listener (callback) for when events occur. (Implemented using EventEmitter.)
+   */
+  on(event: string | symbol, listener: (...args: any[]) => void): this;
+}
+
+export interface CommandOptions {
+  hidden?: boolean;
+  isDefault?: boolean;
+  /** @deprecated since v7, replaced by hidden */
+  noHelp?: boolean;
+}
+export interface ExecutableCommandOptions extends CommandOptions {
+  executableFile?: string;
+}
+
+export interface ParseOptionsResult {
+  operands: string[];
+  unknown: string[];
+}
+
+export function createCommand(name?: string): Command;
+export function createOption(flags: string, description?: string): Option;
+export function createArgument(name: string, description?: string): Argument;
+
+export const program: Command;