Index: frontend/node_modules/execa/lib/command.js
===================================================================
--- frontend/node_modules/execa/lib/command.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/lib/command.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,52 @@
+'use strict';
+const normalizeArgs = (file, args = []) => {
+	if (!Array.isArray(args)) {
+		return [file];
+	}
+
+	return [file, ...args];
+};
+
+const NO_ESCAPE_REGEXP = /^[\w.-]+$/;
+const DOUBLE_QUOTES_REGEXP = /"/g;
+
+const escapeArg = arg => {
+	if (typeof arg !== 'string' || NO_ESCAPE_REGEXP.test(arg)) {
+		return arg;
+	}
+
+	return `"${arg.replace(DOUBLE_QUOTES_REGEXP, '\\"')}"`;
+};
+
+const joinCommand = (file, args) => {
+	return normalizeArgs(file, args).join(' ');
+};
+
+const getEscapedCommand = (file, args) => {
+	return normalizeArgs(file, args).map(arg => escapeArg(arg)).join(' ');
+};
+
+const SPACES_REGEXP = / +/g;
+
+// Handle `execa.command()`
+const parseCommand = command => {
+	const tokens = [];
+	for (const token of command.trim().split(SPACES_REGEXP)) {
+		// Allow spaces to be escaped by a backslash if not meant as a delimiter
+		const previousToken = tokens[tokens.length - 1];
+		if (previousToken && previousToken.endsWith('\\')) {
+			// Merge previous token with current one
+			tokens[tokens.length - 1] = `${previousToken.slice(0, -1)} ${token}`;
+		} else {
+			tokens.push(token);
+		}
+	}
+
+	return tokens;
+};
+
+module.exports = {
+	joinCommand,
+	getEscapedCommand,
+	parseCommand
+};
Index: frontend/node_modules/execa/lib/error.js
===================================================================
--- frontend/node_modules/execa/lib/error.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/lib/error.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,88 @@
+'use strict';
+const {signalsByName} = require('human-signals');
+
+const getErrorPrefix = ({timedOut, timeout, errorCode, signal, signalDescription, exitCode, isCanceled}) => {
+	if (timedOut) {
+		return `timed out after ${timeout} milliseconds`;
+	}
+
+	if (isCanceled) {
+		return 'was canceled';
+	}
+
+	if (errorCode !== undefined) {
+		return `failed with ${errorCode}`;
+	}
+
+	if (signal !== undefined) {
+		return `was killed with ${signal} (${signalDescription})`;
+	}
+
+	if (exitCode !== undefined) {
+		return `failed with exit code ${exitCode}`;
+	}
+
+	return 'failed';
+};
+
+const makeError = ({
+	stdout,
+	stderr,
+	all,
+	error,
+	signal,
+	exitCode,
+	command,
+	escapedCommand,
+	timedOut,
+	isCanceled,
+	killed,
+	parsed: {options: {timeout}}
+}) => {
+	// `signal` and `exitCode` emitted on `spawned.on('exit')` event can be `null`.
+	// We normalize them to `undefined`
+	exitCode = exitCode === null ? undefined : exitCode;
+	signal = signal === null ? undefined : signal;
+	const signalDescription = signal === undefined ? undefined : signalsByName[signal].description;
+
+	const errorCode = error && error.code;
+
+	const prefix = getErrorPrefix({timedOut, timeout, errorCode, signal, signalDescription, exitCode, isCanceled});
+	const execaMessage = `Command ${prefix}: ${command}`;
+	const isError = Object.prototype.toString.call(error) === '[object Error]';
+	const shortMessage = isError ? `${execaMessage}\n${error.message}` : execaMessage;
+	const message = [shortMessage, stderr, stdout].filter(Boolean).join('\n');
+
+	if (isError) {
+		error.originalMessage = error.message;
+		error.message = message;
+	} else {
+		error = new Error(message);
+	}
+
+	error.shortMessage = shortMessage;
+	error.command = command;
+	error.escapedCommand = escapedCommand;
+	error.exitCode = exitCode;
+	error.signal = signal;
+	error.signalDescription = signalDescription;
+	error.stdout = stdout;
+	error.stderr = stderr;
+
+	if (all !== undefined) {
+		error.all = all;
+	}
+
+	if ('bufferedData' in error) {
+		delete error.bufferedData;
+	}
+
+	error.failed = true;
+	error.timedOut = Boolean(timedOut);
+	error.isCanceled = isCanceled;
+	error.killed = killed && !timedOut;
+
+	return error;
+};
+
+module.exports = makeError;
Index: frontend/node_modules/execa/lib/kill.js
===================================================================
--- frontend/node_modules/execa/lib/kill.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/lib/kill.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,115 @@
+'use strict';
+const os = require('os');
+const onExit = require('signal-exit');
+
+const DEFAULT_FORCE_KILL_TIMEOUT = 1000 * 5;
+
+// Monkey-patches `childProcess.kill()` to add `forceKillAfterTimeout` behavior
+const spawnedKill = (kill, signal = 'SIGTERM', options = {}) => {
+	const killResult = kill(signal);
+	setKillTimeout(kill, signal, options, killResult);
+	return killResult;
+};
+
+const setKillTimeout = (kill, signal, options, killResult) => {
+	if (!shouldForceKill(signal, options, killResult)) {
+		return;
+	}
+
+	const timeout = getForceKillAfterTimeout(options);
+	const t = setTimeout(() => {
+		kill('SIGKILL');
+	}, timeout);
+
+	// Guarded because there's no `.unref()` when `execa` is used in the renderer
+	// process in Electron. This cannot be tested since we don't run tests in
+	// Electron.
+	// istanbul ignore else
+	if (t.unref) {
+		t.unref();
+	}
+};
+
+const shouldForceKill = (signal, {forceKillAfterTimeout}, killResult) => {
+	return isSigterm(signal) && forceKillAfterTimeout !== false && killResult;
+};
+
+const isSigterm = signal => {
+	return signal === os.constants.signals.SIGTERM ||
+		(typeof signal === 'string' && signal.toUpperCase() === 'SIGTERM');
+};
+
+const getForceKillAfterTimeout = ({forceKillAfterTimeout = true}) => {
+	if (forceKillAfterTimeout === true) {
+		return DEFAULT_FORCE_KILL_TIMEOUT;
+	}
+
+	if (!Number.isFinite(forceKillAfterTimeout) || forceKillAfterTimeout < 0) {
+		throw new TypeError(`Expected the \`forceKillAfterTimeout\` option to be a non-negative integer, got \`${forceKillAfterTimeout}\` (${typeof forceKillAfterTimeout})`);
+	}
+
+	return forceKillAfterTimeout;
+};
+
+// `childProcess.cancel()`
+const spawnedCancel = (spawned, context) => {
+	const killResult = spawned.kill();
+
+	if (killResult) {
+		context.isCanceled = true;
+	}
+};
+
+const timeoutKill = (spawned, signal, reject) => {
+	spawned.kill(signal);
+	reject(Object.assign(new Error('Timed out'), {timedOut: true, signal}));
+};
+
+// `timeout` option handling
+const setupTimeout = (spawned, {timeout, killSignal = 'SIGTERM'}, spawnedPromise) => {
+	if (timeout === 0 || timeout === undefined) {
+		return spawnedPromise;
+	}
+
+	let timeoutId;
+	const timeoutPromise = new Promise((resolve, reject) => {
+		timeoutId = setTimeout(() => {
+			timeoutKill(spawned, killSignal, reject);
+		}, timeout);
+	});
+
+	const safeSpawnedPromise = spawnedPromise.finally(() => {
+		clearTimeout(timeoutId);
+	});
+
+	return Promise.race([timeoutPromise, safeSpawnedPromise]);
+};
+
+const validateTimeout = ({timeout}) => {
+	if (timeout !== undefined && (!Number.isFinite(timeout) || timeout < 0)) {
+		throw new TypeError(`Expected the \`timeout\` option to be a non-negative integer, got \`${timeout}\` (${typeof timeout})`);
+	}
+};
+
+// `cleanup` option handling
+const setExitHandler = async (spawned, {cleanup, detached}, timedPromise) => {
+	if (!cleanup || detached) {
+		return timedPromise;
+	}
+
+	const removeExitHandler = onExit(() => {
+		spawned.kill();
+	});
+
+	return timedPromise.finally(() => {
+		removeExitHandler();
+	});
+};
+
+module.exports = {
+	spawnedKill,
+	spawnedCancel,
+	setupTimeout,
+	validateTimeout,
+	setExitHandler
+};
Index: frontend/node_modules/execa/lib/promise.js
===================================================================
--- frontend/node_modules/execa/lib/promise.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/lib/promise.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,46 @@
+'use strict';
+
+const nativePromisePrototype = (async () => {})().constructor.prototype;
+const descriptors = ['then', 'catch', 'finally'].map(property => [
+	property,
+	Reflect.getOwnPropertyDescriptor(nativePromisePrototype, property)
+]);
+
+// The return value is a mixin of `childProcess` and `Promise`
+const mergePromise = (spawned, promise) => {
+	for (const [property, descriptor] of descriptors) {
+		// Starting the main `promise` is deferred to avoid consuming streams
+		const value = typeof promise === 'function' ?
+			(...args) => Reflect.apply(descriptor.value, promise(), args) :
+			descriptor.value.bind(promise);
+
+		Reflect.defineProperty(spawned, property, {...descriptor, value});
+	}
+
+	return spawned;
+};
+
+// Use promises instead of `child_process` events
+const getSpawnedPromise = spawned => {
+	return new Promise((resolve, reject) => {
+		spawned.on('exit', (exitCode, signal) => {
+			resolve({exitCode, signal});
+		});
+
+		spawned.on('error', error => {
+			reject(error);
+		});
+
+		if (spawned.stdin) {
+			spawned.stdin.on('error', error => {
+				reject(error);
+			});
+		}
+	});
+};
+
+module.exports = {
+	mergePromise,
+	getSpawnedPromise
+};
+
Index: frontend/node_modules/execa/lib/stdio.js
===================================================================
--- frontend/node_modules/execa/lib/stdio.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/lib/stdio.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,52 @@
+'use strict';
+const aliases = ['stdin', 'stdout', 'stderr'];
+
+const hasAlias = options => aliases.some(alias => options[alias] !== undefined);
+
+const normalizeStdio = options => {
+	if (!options) {
+		return;
+	}
+
+	const {stdio} = options;
+
+	if (stdio === undefined) {
+		return aliases.map(alias => options[alias]);
+	}
+
+	if (hasAlias(options)) {
+		throw new Error(`It's not possible to provide \`stdio\` in combination with one of ${aliases.map(alias => `\`${alias}\``).join(', ')}`);
+	}
+
+	if (typeof stdio === 'string') {
+		return stdio;
+	}
+
+	if (!Array.isArray(stdio)) {
+		throw new TypeError(`Expected \`stdio\` to be of type \`string\` or \`Array\`, got \`${typeof stdio}\``);
+	}
+
+	const length = Math.max(stdio.length, aliases.length);
+	return Array.from({length}, (value, index) => stdio[index]);
+};
+
+module.exports = normalizeStdio;
+
+// `ipc` is pushed unless it is already present
+module.exports.node = options => {
+	const stdio = normalizeStdio(options);
+
+	if (stdio === 'ipc') {
+		return 'ipc';
+	}
+
+	if (stdio === undefined || typeof stdio === 'string') {
+		return [stdio, stdio, stdio, 'ipc'];
+	}
+
+	if (stdio.includes('ipc')) {
+		return stdio;
+	}
+
+	return [...stdio, 'ipc'];
+};
Index: frontend/node_modules/execa/lib/stream.js
===================================================================
--- frontend/node_modules/execa/lib/stream.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/execa/lib/stream.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,97 @@
+'use strict';
+const isStream = require('is-stream');
+const getStream = require('get-stream');
+const mergeStream = require('merge-stream');
+
+// `input` option
+const handleInput = (spawned, input) => {
+	// Checking for stdin is workaround for https://github.com/nodejs/node/issues/26852
+	// @todo remove `|| spawned.stdin === undefined` once we drop support for Node.js <=12.2.0
+	if (input === undefined || spawned.stdin === undefined) {
+		return;
+	}
+
+	if (isStream(input)) {
+		input.pipe(spawned.stdin);
+	} else {
+		spawned.stdin.end(input);
+	}
+};
+
+// `all` interleaves `stdout` and `stderr`
+const makeAllStream = (spawned, {all}) => {
+	if (!all || (!spawned.stdout && !spawned.stderr)) {
+		return;
+	}
+
+	const mixed = mergeStream();
+
+	if (spawned.stdout) {
+		mixed.add(spawned.stdout);
+	}
+
+	if (spawned.stderr) {
+		mixed.add(spawned.stderr);
+	}
+
+	return mixed;
+};
+
+// On failure, `result.stdout|stderr|all` should contain the currently buffered stream
+const getBufferedData = async (stream, streamPromise) => {
+	if (!stream) {
+		return;
+	}
+
+	stream.destroy();
+
+	try {
+		return await streamPromise;
+	} catch (error) {
+		return error.bufferedData;
+	}
+};
+
+const getStreamPromise = (stream, {encoding, buffer, maxBuffer}) => {
+	if (!stream || !buffer) {
+		return;
+	}
+
+	if (encoding) {
+		return getStream(stream, {encoding, maxBuffer});
+	}
+
+	return getStream.buffer(stream, {maxBuffer});
+};
+
+// Retrieve result of child process: exit code, signal, error, streams (stdout/stderr/all)
+const getSpawnedResult = async ({stdout, stderr, all}, {encoding, buffer, maxBuffer}, processDone) => {
+	const stdoutPromise = getStreamPromise(stdout, {encoding, buffer, maxBuffer});
+	const stderrPromise = getStreamPromise(stderr, {encoding, buffer, maxBuffer});
+	const allPromise = getStreamPromise(all, {encoding, buffer, maxBuffer: maxBuffer * 2});
+
+	try {
+		return await Promise.all([processDone, stdoutPromise, stderrPromise, allPromise]);
+	} catch (error) {
+		return Promise.all([
+			{error, signal: error.signal, timedOut: error.timedOut},
+			getBufferedData(stdout, stdoutPromise),
+			getBufferedData(stderr, stderrPromise),
+			getBufferedData(all, allPromise)
+		]);
+	}
+};
+
+const validateInputSync = ({input}) => {
+	if (isStream(input)) {
+		throw new TypeError('The `input` option cannot be a stream in sync mode');
+	}
+};
+
+module.exports = {
+	handleInput,
+	makeAllStream,
+	getSpawnedResult,
+	validateInputSync
+};
+