Index: frontend/node_modules/execa/index.js
===================================================================
--- frontend/node_modules/execa/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,268 @@
+'use strict';
+const path = require('path');
+const childProcess = require('child_process');
+const crossSpawn = require('cross-spawn');
+const stripFinalNewline = require('strip-final-newline');
+const npmRunPath = require('npm-run-path');
+const onetime = require('onetime');
+const makeError = require('./lib/error');
+const normalizeStdio = require('./lib/stdio');
+const {spawnedKill, spawnedCancel, setupTimeout, validateTimeout, setExitHandler} = require('./lib/kill');
+const {handleInput, getSpawnedResult, makeAllStream, validateInputSync} = require('./lib/stream');
+const {mergePromise, getSpawnedPromise} = require('./lib/promise');
+const {joinCommand, parseCommand, getEscapedCommand} = require('./lib/command');
+
+const DEFAULT_MAX_BUFFER = 1000 * 1000 * 100;
+
+const getEnv = ({env: envOption, extendEnv, preferLocal, localDir, execPath}) => {
+	const env = extendEnv ? {...process.env, ...envOption} : envOption;
+
+	if (preferLocal) {
+		return npmRunPath.env({env, cwd: localDir, execPath});
+	}
+
+	return env;
+};
+
+const handleArguments = (file, args, options = {}) => {
+	const parsed = crossSpawn._parse(file, args, options);
+	file = parsed.command;
+	args = parsed.args;
+	options = parsed.options;
+
+	options = {
+		maxBuffer: DEFAULT_MAX_BUFFER,
+		buffer: true,
+		stripFinalNewline: true,
+		extendEnv: true,
+		preferLocal: false,
+		localDir: options.cwd || process.cwd(),
+		execPath: process.execPath,
+		encoding: 'utf8',
+		reject: true,
+		cleanup: true,
+		all: false,
+		windowsHide: true,
+		...options
+	};
+
+	options.env = getEnv(options);
+
+	options.stdio = normalizeStdio(options);
+
+	if (process.platform === 'win32' && path.basename(file, '.exe') === 'cmd') {
+		// #116
+		args.unshift('/q');
+	}
+
+	return {file, args, options, parsed};
+};
+
+const handleOutput = (options, value, error) => {
+	if (typeof value !== 'string' && !Buffer.isBuffer(value)) {
+		// When `execa.sync()` errors, we normalize it to '' to mimic `execa()`
+		return error === undefined ? undefined : '';
+	}
+
+	if (options.stripFinalNewline) {
+		return stripFinalNewline(value);
+	}
+
+	return value;
+};
+
+const execa = (file, args, options) => {
+	const parsed = handleArguments(file, args, options);
+	const command = joinCommand(file, args);
+	const escapedCommand = getEscapedCommand(file, args);
+
+	validateTimeout(parsed.options);
+
+	let spawned;
+	try {
+		spawned = childProcess.spawn(parsed.file, parsed.args, parsed.options);
+	} catch (error) {
+		// Ensure the returned error is always both a promise and a child process
+		const dummySpawned = new childProcess.ChildProcess();
+		const errorPromise = Promise.reject(makeError({
+			error,
+			stdout: '',
+			stderr: '',
+			all: '',
+			command,
+			escapedCommand,
+			parsed,
+			timedOut: false,
+			isCanceled: false,
+			killed: false
+		}));
+		return mergePromise(dummySpawned, errorPromise);
+	}
+
+	const spawnedPromise = getSpawnedPromise(spawned);
+	const timedPromise = setupTimeout(spawned, parsed.options, spawnedPromise);
+	const processDone = setExitHandler(spawned, parsed.options, timedPromise);
+
+	const context = {isCanceled: false};
+
+	spawned.kill = spawnedKill.bind(null, spawned.kill.bind(spawned));
+	spawned.cancel = spawnedCancel.bind(null, spawned, context);
+
+	const handlePromise = async () => {
+		const [{error, exitCode, signal, timedOut}, stdoutResult, stderrResult, allResult] = await getSpawnedResult(spawned, parsed.options, processDone);
+		const stdout = handleOutput(parsed.options, stdoutResult);
+		const stderr = handleOutput(parsed.options, stderrResult);
+		const all = handleOutput(parsed.options, allResult);
+
+		if (error || exitCode !== 0 || signal !== null) {
+			const returnedError = makeError({
+				error,
+				exitCode,
+				signal,
+				stdout,
+				stderr,
+				all,
+				command,
+				escapedCommand,
+				parsed,
+				timedOut,
+				isCanceled: context.isCanceled,
+				killed: spawned.killed
+			});
+
+			if (!parsed.options.reject) {
+				return returnedError;
+			}
+
+			throw returnedError;
+		}
+
+		return {
+			command,
+			escapedCommand,
+			exitCode: 0,
+			stdout,
+			stderr,
+			all,
+			failed: false,
+			timedOut: false,
+			isCanceled: false,
+			killed: false
+		};
+	};
+
+	const handlePromiseOnce = onetime(handlePromise);
+
+	handleInput(spawned, parsed.options.input);
+
+	spawned.all = makeAllStream(spawned, parsed.options);
+
+	return mergePromise(spawned, handlePromiseOnce);
+};
+
+module.exports = execa;
+
+module.exports.sync = (file, args, options) => {
+	const parsed = handleArguments(file, args, options);
+	const command = joinCommand(file, args);
+	const escapedCommand = getEscapedCommand(file, args);
+
+	validateInputSync(parsed.options);
+
+	let result;
+	try {
+		result = childProcess.spawnSync(parsed.file, parsed.args, parsed.options);
+	} catch (error) {
+		throw makeError({
+			error,
+			stdout: '',
+			stderr: '',
+			all: '',
+			command,
+			escapedCommand,
+			parsed,
+			timedOut: false,
+			isCanceled: false,
+			killed: false
+		});
+	}
+
+	const stdout = handleOutput(parsed.options, result.stdout, result.error);
+	const stderr = handleOutput(parsed.options, result.stderr, result.error);
+
+	if (result.error || result.status !== 0 || result.signal !== null) {
+		const error = makeError({
+			stdout,
+			stderr,
+			error: result.error,
+			signal: result.signal,
+			exitCode: result.status,
+			command,
+			escapedCommand,
+			parsed,
+			timedOut: result.error && result.error.code === 'ETIMEDOUT',
+			isCanceled: false,
+			killed: result.signal !== null
+		});
+
+		if (!parsed.options.reject) {
+			return error;
+		}
+
+		throw error;
+	}
+
+	return {
+		command,
+		escapedCommand,
+		exitCode: 0,
+		stdout,
+		stderr,
+		failed: false,
+		timedOut: false,
+		isCanceled: false,
+		killed: false
+	};
+};
+
+module.exports.command = (command, options) => {
+	const [file, ...args] = parseCommand(command);
+	return execa(file, args, options);
+};
+
+module.exports.commandSync = (command, options) => {
+	const [file, ...args] = parseCommand(command);
+	return execa.sync(file, args, options);
+};
+
+module.exports.node = (scriptPath, args, options = {}) => {
+	if (args && !Array.isArray(args) && typeof args === 'object') {
+		options = args;
+		args = [];
+	}
+
+	const stdio = normalizeStdio.node(options);
+	const defaultExecArgv = process.execArgv.filter(arg => !arg.startsWith('--inspect'));
+
+	const {
+		nodePath = process.execPath,
+		nodeOptions = defaultExecArgv
+	} = options;
+
+	return execa(
+		nodePath,
+		[
+			...nodeOptions,
+			scriptPath,
+			...(Array.isArray(args) ? args : [])
+		],
+		{
+			...options,
+			stdin: undefined,
+			stdout: undefined,
+			stderr: undefined,
+			stdio,
+			shell: false
+		}
+	);
+};