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1 files changed, 1756 insertions, 0 deletions

diff --git a/desktop/node_modules/commander/index.js b/desktop/node_modules/commander/index.js
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+/**
+ * Module dependencies.
+ */
+
+const EventEmitter = require('events').EventEmitter;
+const spawn = require('child_process').spawn;
+const path = require('path');
+const fs = require('fs');
+
+// @ts-check
+
+class Option {
+  /**
+   * Initialize a new `Option` with the given `flags` and `description`.
+   *
+   * @param {string} flags
+   * @param {string} description
+   * @api public
+   */
+
+  constructor(flags, description) {
+    this.flags = flags;
+    this.required = flags.indexOf('<') >= 0; // A value must be supplied when the option is specified.
+    this.optional = flags.indexOf('[') >= 0; // A value is optional when the option is specified.
+    this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
+    this.negate = flags.indexOf('-no-') !== -1;
+    const flagParts = flags.split(/[ ,|]+/);
+    if (flagParts.length > 1 && !/^[[<]/.test(flagParts[1])) this.short = flagParts.shift();
+    this.long = flagParts.shift();
+    this.description = description || '';
+    this.defaultValue = undefined;
+  }
+
+  /**
+   * Return option name.
+   *
+   * @return {string}
+   * @api private
+   */
+
+  name() {
+    return this.long.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;
+  };
+}
+
+/**
+ * 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;
+  }
+}
+
+class Command extends EventEmitter {
+  /**
+   * Initialize a new `Command`.
+   *
+   * @param {string} [name]
+   * @api public
+   */
+
+  constructor(name) {
+    super();
+    this.commands = [];
+    this.options = [];
+    this.parent = null;
+    this._allowUnknownOption = false;
+    this._args = [];
+    this.rawArgs = null;
+    this._scriptPath = null;
+    this._name = name || '';
+    this._optionValues = {};
+    this._storeOptionsAsProperties = true; // backwards compatible by default
+    this._passCommandToAction = true; // backwards compatible by default
+    this._actionResults = [];
+    this._actionHandler = null;
+    this._executableHandler = false;
+    this._executableFile = null; // custom name for executable
+    this._defaultCommandName = null;
+    this._exitCallback = null;
+    this._aliases = [];
+
+    this._hidden = false;
+    this._helpFlags = '-h, --help';
+    this._helpDescription = 'display help for command';
+    this._helpShortFlag = '-h';
+    this._helpLongFlag = '--help';
+    this._hasImplicitHelpCommand = undefined; // Deliberately undefined, not decided whether true or false
+    this._helpCommandName = 'help';
+    this._helpCommandnameAndArgs = 'help [command]';
+    this._helpCommandDescription = 'display help for command';
+  }
+
+  /**
+   * Define a command.
+   *
+   * There are two styles of command: pay attention to where to put the description.
+   *
+   * Examples:
+   *
+   *      // 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
+   * @api public
+   */
+
+  command(nameAndArgs, actionOptsOrExecDesc, execOpts) {
+    let desc = actionOptsOrExecDesc;
+    let opts = execOpts;
+    if (typeof desc === 'object' && desc !== null) {
+      opts = desc;
+      desc = null;
+    }
+    opts = opts || {};
+    const args = nameAndArgs.split(/ +/);
+    const cmd = this.createCommand(args.shift());
+
+    if (desc) {
+      cmd.description(desc);
+      cmd._executableHandler = true;
+    }
+    if (opts.isDefault) this._defaultCommandName = cmd._name;
+
+    cmd._hidden = !!(opts.noHelp || opts.hidden);
+    cmd._helpFlags = this._helpFlags;
+    cmd._helpDescription = this._helpDescription;
+    cmd._helpShortFlag = this._helpShortFlag;
+    cmd._helpLongFlag = this._helpLongFlag;
+    cmd._helpCommandName = this._helpCommandName;
+    cmd._helpCommandnameAndArgs = this._helpCommandnameAndArgs;
+    cmd._helpCommandDescription = this._helpCommandDescription;
+    cmd._exitCallback = this._exitCallback;
+    cmd._storeOptionsAsProperties = this._storeOptionsAsProperties;
+    cmd._passCommandToAction = this._passCommandToAction;
+
+    cmd._executableFile = opts.executableFile || null; // Custom name for executable file, set missing to null to match constructor
+    this.commands.push(cmd);
+    cmd._parseExpectedArgs(args);
+    cmd.parent = 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
+   * @api public
+   */
+
+  createCommand(name) {
+    return new Command(name);
+  };
+
+  /**
+   * 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
+   * @api public
+   */
+
+  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;
+  };
+
+  /**
+   * Define argument syntax for the command.
+   *
+   * @api public
+   */
+
+  arguments(desc) {
+    return this._parseExpectedArgs(desc.split(/ +/));
+  };
+
+  /**
+   * 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 detais
+   *
+   * @return {Command} `this` command for chaining
+   * @api public
+   */
+
+  addHelpCommand(enableOrNameAndArgs, description) {
+    if (enableOrNameAndArgs === false) {
+      this._hasImplicitHelpCommand = false;
+    } else {
+      this._hasImplicitHelpCommand = true;
+      if (typeof enableOrNameAndArgs === 'string') {
+        this._helpCommandName = enableOrNameAndArgs.split(' ')[0];
+        this._helpCommandnameAndArgs = enableOrNameAndArgs;
+      }
+      this._helpCommandDescription = description || this._helpCommandDescription;
+    }
+    return this;
+  };
+
+  /**
+   * @return {boolean}
+   * @api private
+   */
+
+  _lazyHasImplicitHelpCommand() {
+    if (this._hasImplicitHelpCommand === undefined) {
+      this._hasImplicitHelpCommand = this.commands.length && !this._actionHandler && !this._findCommand('help');
+    }
+    return this._hasImplicitHelpCommand;
+  };
+
+  /**
+   * Parse expected `args`.
+   *
+   * For example `["[type]"]` becomes `[{ required: false, name: 'type' }]`.
+   *
+   * @param {Array} args
+   * @return {Command} `this` command for chaining
+   * @api private
+   */
+
+  _parseExpectedArgs(args) {
+    if (!args.length) return;
+    args.forEach((arg) => {
+      const argDetails = {
+        required: false,
+        name: '',
+        variadic: false
+      };
+
+      switch (arg[0]) {
+        case '<':
+          argDetails.required = true;
+          argDetails.name = arg.slice(1, -1);
+          break;
+        case '[':
+          argDetails.name = arg.slice(1, -1);
+          break;
+      }
+
+      if (argDetails.name.length > 3 && argDetails.name.slice(-3) === '...') {
+        argDetails.variadic = true;
+        argDetails.name = argDetails.name.slice(0, -3);
+      }
+      if (argDetails.name) {
+        this._args.push(argDetails);
+      }
+    });
+    this._args.forEach((arg, i) => {
+      if (arg.variadic && i < this._args.length - 1) {
+        throw new Error(`only the last argument can be variadic '${arg.name}'`);
+      }
+    });
+    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
+   * @api public
+   */
+
+  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.
+   *
+   * Examples:
+   *
+   *      program
+   *        .command('help')
+   *        .description('display verbose help')
+   *        .action(function() {
+   *           // output help here
+   *        });
+   *
+   * @param {Function} fn
+   * @return {Command} `this` command for chaining
+   * @api public
+   */
+
+  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._passCommandToAction) {
+        actionArgs[expectedArgsCount] = this;
+      } else {
+        actionArgs[expectedArgsCount] = this.opts();
+      }
+      // Add the extra arguments so available too.
+      if (args.length > expectedArgsCount) {
+        actionArgs.push(args.slice(expectedArgsCount));
+      }
+
+      const actionResult = fn.apply(this, actionArgs);
+      // Remember result in case it is async. Assume parseAsync getting called on root.
+      let rootCommand = this;
+      while (rootCommand.parent) {
+        rootCommand = rootCommand.parent;
+      }
+      rootCommand._actionResults.push(actionResult);
+    };
+    this._actionHandler = listener;
+    return this;
+  };
+
+  /**
+   * Internal implementation shared by .option() and .requiredOption()
+   *
+   * @param {Object} config
+   * @param {string} flags
+   * @param {string} description
+   * @param {Function|*} [fn] - custom option processing function or default vaue
+   * @param {*} [defaultValue]
+   * @return {Command} `this` command for chaining
+   * @api private
+   */
+
+  _optionEx(config, flags, description, fn, defaultValue) {
+    const option = new Option(flags, description);
+    const oname = option.name();
+    const name = option.attributeName();
+    option.mandatory = !!config.mandatory;
+
+    // default as 3rd arg
+    if (typeof fn !== 'function') {
+      if (fn instanceof RegExp) {
+        // This is a bit simplistic (especially no error messages), and probably better handled by caller using custom option processing.
+        // No longer documented in README, but still present for backwards compatibility.
+        const regex = fn;
+        fn = (val, def) => {
+          const m = regex.exec(val);
+          return m ? m[0] : def;
+        };
+      } else {
+        defaultValue = fn;
+        fn = null;
+      }
+    }
+
+    // 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._setOptionValue(name, defaultValue);
+        option.defaultValue = defaultValue;
+      }
+    }
+
+    // register the option
+    this.options.push(option);
+
+    // when it's passed assign the value
+    // and conditionally invoke the callback
+    this.on('option:' + oname, (val) => {
+      // coercion
+      if (val !== null && fn) {
+        val = fn(val, this._getOptionValue(name) === undefined ? defaultValue : this._getOptionValue(name));
+      }
+
+      // unassigned or boolean value
+      if (typeof this._getOptionValue(name) === 'boolean' || typeof this._getOptionValue(name) === 'undefined') {
+        // if no value, negate false, and we have a default, then use it!
+        if (val == null) {
+          this._setOptionValue(name, option.negate
+            ? false
+            : defaultValue || true);
+        } else {
+          this._setOptionValue(name, val);
+        }
+      } else if (val !== null) {
+        // reassign
+        this._setOptionValue(name, option.negate ? false : val);
+      }
+    });
+
+    return this;
+  };
+
+  /**
+   * Define option with `flags`, `description` and optional
+   * coercion `fn`.
+   *
+   * The `flags` string should contain both the short and 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"
+   *
+   * Examples:
+   *
+   *     // 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 vaue
+   * @param {*} [defaultValue]
+   * @return {Command} `this` command for chaining
+   * @api public
+   */
+
+  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 should contain both the short and long flags, separated by comma, a pipe or space.
+  *
+  * @param {string} flags
+  * @param {string} description
+  * @param {Function|*} [fn] - custom option processing function or default vaue
+  * @param {*} [defaultValue]
+  * @return {Command} `this` command for chaining
+  * @api public
+  */
+
+  requiredOption(flags, description, fn, defaultValue) {
+    return this._optionEx({ mandatory: true }, flags, description, fn, defaultValue);
+  };
+
+  /**
+   * Allow unknown options on the command line.
+   *
+   * @param {Boolean} [arg] - if `true` or omitted, no error will be thrown
+   * for unknown options.
+   * @api public
+   */
+  allowUnknownOption(arg) {
+    this._allowUnknownOption = (arg === undefined) || arg;
+    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} value
+    * @return {Command} `this` command for chaining
+    * @api public
+    */
+
+  storeOptionsAsProperties(value) {
+    this._storeOptionsAsProperties = (value === undefined) || value;
+    if (this.options.length) {
+      throw new Error('call .storeOptionsAsProperties() before adding options');
+    }
+    return this;
+  };
+
+  /**
+    * Whether to pass command to action handler,
+    * or just the options (specify false).
+    *
+    * @param {boolean} value
+    * @return {Command} `this` command for chaining
+    * @api public
+    */
+
+  passCommandToAction(value) {
+    this._passCommandToAction = (value === undefined) || value;
+    return this;
+  };
+
+  /**
+   * Store option value
+   *
+   * @param {string} key
+   * @param {Object} value
+   * @api private
+   */
+
+  _setOptionValue(key, value) {
+    if (this._storeOptionsAsProperties) {
+      this[key] = value;
+    } else {
+      this._optionValues[key] = value;
+    }
+  };
+
+  /**
+   * Retrieve option value
+   *
+   * @param {string} key
+   * @return {Object} value
+   * @api private
+   */
+
+  _getOptionValue(key) {
+    if (this._storeOptionsAsProperties) {
+      return this[key];
+    }
+    return this._optionValues[key];
+  };
+
+  /**
+   * 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.
+   *
+   * Examples:
+   *
+   *      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
+   * @api public
+   */
+
+  parse(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
+      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
+        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 && process.mainModule) {
+      this._scriptPath = process.mainModule.filename;
+    }
+
+    // Guess name, used in usage in help.
+    this._name = this._name || (this._scriptPath && path.basename(this._scriptPath, path.extname(this._scriptPath)));
+
+    // Let's go!
+    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.
+   *
+   * Examples:
+   *
+   *      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]
+   *
+   * @param {string[]} [argv]
+   * @param {Object} [parseOptions]
+   * @param {string} parseOptions.from - where the args are from: 'node', 'user', 'electron'
+   * @return {Promise}
+   * @api public
+   */
+
+  parseAsync(argv, parseOptions) {
+    this.parse(argv, parseOptions);
+    return Promise.all(this._actionResults).then(() => 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', '.mjs'];
+
+    // 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.
+    const scriptPath = this._scriptPath;
+
+    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}${ext}`;
+        }
+      });
+    }
+    launchWithNode = sourceExt.includes(path.extname(bin));
+
+    let proc;
+    if (process.platform !== 'win32') {
+      if (launchWithNode) {
+        args.unshift(bin);
+        // add executable arguments to spawn
+        args = incrementNodeInspectorPort(process.execArgv).concat(args);
+
+        proc = spawn(process.argv[0], args, { stdio: 'inherit' });
+      } else {
+        proc = spawn(bin, args, { stdio: 'inherit' });
+      }
+    } else {
+      args.unshift(bin);
+      // add executable arguments to spawn
+      args = incrementNodeInspectorPort(process.execArgv).concat(args);
+      proc = spawn(process.execPath, args, { stdio: 'inherit' });
+    }
+
+    const signals = ['SIGUSR1', 'SIGUSR2', 'SIGTERM', 'SIGINT', 'SIGHUP'];
+    signals.forEach((signal) => {
+      // @ts-ignore
+      process.on(signal, () => {
+        if (proc.killed === false && proc.exitCode === null) {
+          proc.kill(signal);
+        }
+      });
+    });
+
+    // By default terminate process when spawned process terminates.
+    // Suppressing the exit if exitCallback defined is a bit messy and of limited use, but does allow process to stay running!
+    const exitCallback = this._exitCallback;
+    if (!exitCallback) {
+      proc.on('close', process.exit.bind(process));
+    } else {
+      proc.on('close', () => {
+        exitCallback(new CommanderError(process.exitCode || 0, 'commander.executeSubCommandAsync', '(close)'));
+      });
+    }
+    proc.on('error', (err) => {
+      // @ts-ignore
+      if (err.code === 'ENOENT') {
+        const executableMissing = `'${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._helpAndError();
+
+    if (subCommand._executableHandler) {
+      this._executeSubCommand(subCommand, operands.concat(unknown));
+    } else {
+      subCommand._parseCommand(operands, unknown);
+    }
+  };
+
+  /**
+   * Process arguments in context of this command.
+   *
+   * @api private
+   */
+
+  _parseCommand(operands, unknown) {
+    const parsed = this.parseOptions(unknown);
+    operands = operands.concat(parsed.operands);
+    unknown = parsed.unknown;
+    this.args = operands.concat(unknown);
+
+    if (operands && this._findCommand(operands[0])) {
+      this._dispatchSubcommand(operands[0], operands.slice(1), unknown);
+    } else if (this._lazyHasImplicitHelpCommand() && operands[0] === this._helpCommandName) {
+      if (operands.length === 1) {
+        this.help();
+      } else {
+        this._dispatchSubcommand(operands[1], [], [this._helpLongFlag]);
+      }
+    } else if (this._defaultCommandName) {
+      outputHelpIfRequested(this, unknown); // Run the help for default command from parent rather than passing to default command
+      this._dispatchSubcommand(this._defaultCommandName, operands, unknown);
+    } else {
+      if (this.commands.length && this.args.length === 0 && !this._actionHandler && !this._defaultCommandName) {
+        // probaby missing subcommand and no handler, user needs help
+        this._helpAndError();
+      }
+
+      outputHelpIfRequested(this, parsed.unknown);
+      this._checkForMissingMandatoryOptions();
+      if (parsed.unknown.length > 0) {
+        this.unknownOption(parsed.unknown[0]);
+      }
+
+      if (this._actionHandler) {
+        const args = this.args.slice();
+        this._args.forEach((arg, i) => {
+          if (arg.required && args[i] == null) {
+            this.missingArgument(arg.name);
+          } else if (arg.variadic) {
+            args[i] = args.splice(i);
+          }
+        });
+
+        this._actionHandler(args);
+        this.emit('command:' + this.name(), operands, unknown);
+      } else if (operands.length) {
+        if (this._findCommand('*')) {
+          this._dispatchSubcommand('*', operands, unknown);
+        } else if (this.listenerCount('command:*')) {
+          this.emit('command:*', operands, unknown);
+        } else if (this.commands.length) {
+          this.unknownCommand();
+        }
+      } else if (this.commands.length) {
+        // This command has subcommands and nothing hooked up at this level, so display help.
+        this._helpAndError();
+      } else {
+        // 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[]}}
+   * @api public
+   */
+
+  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
+    while (args.length) {
+      const arg = args.shift();
+
+      // literal
+      if (arg === '--') {
+        if (dest === unknown) dest.push(arg);
+        dest.push(...args);
+        break;
+      }
+
+      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:${option.name()}`);
+          }
+          continue;
+        }
+      }
+
+      // Look for combo options following single dash, eat first one if known.
+      if (arg.length > 2 && arg[0] === '-' && arg[1] !== '-') {
+        const option = this._findOption(`-${arg[1]}`);
+        if (option) {
+          if (option.required || option.optional) {
+            // 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;
+        }
+      }
+
+      // looks like an option but unknown, unknowns from here
+      if (arg.length > 1 && arg[0] === '-') {
+        dest = unknown;
+      }
+
+      // add arg
+      dest.push(arg);
+    }
+
+    return { operands, unknown };
+  };
+
+  /**
+   * Return an object containing options as key-value pairs
+   *
+   * @return {Object}
+   * @api public
+   */
+  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;
+  };
+
+  /**
+   * Argument `name` is missing.
+   *
+   * @param {string} name
+   * @api private
+   */
+
+  missingArgument(name) {
+    const message = `error: missing required argument '${name}'`;
+    console.error(message);
+    this._exit(1, 'commander.missingArgument', message);
+  };
+
+  /**
+   * `Option` is missing an argument, but received `flag` or nothing.
+   *
+   * @param {Option} option
+   * @param {string} [flag]
+   * @api private
+   */
+
+  optionMissingArgument(option, flag) {
+    let message;
+    if (flag) {
+      message = `error: option '${option.flags}' argument missing, got '${flag}'`;
+    } else {
+      message = `error: option '${option.flags}' argument missing`;
+    }
+    console.error(message);
+    this._exit(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 '${option.flags}' not specified`;
+    console.error(message);
+    this._exit(1, 'commander.missingMandatoryOptionValue', message);
+  };
+
+  /**
+   * Unknown option `flag`.
+   *
+   * @param {string} flag
+   * @api private
+   */
+
+  unknownOption(flag) {
+    if (this._allowUnknownOption) return;
+    const message = `error: unknown option '${flag}'`;
+    console.error(message);
+    this._exit(1, 'commander.unknownOption', message);
+  };
+
+  /**
+   * Unknown command.
+   *
+   * @api private
+   */
+
+  unknownCommand() {
+    const partCommands = [this.name()];
+    for (let parentCmd = this.parent; parentCmd; parentCmd = parentCmd.parent) {
+      partCommands.unshift(parentCmd.name());
+    }
+    const fullCommand = partCommands.join(' ');
+    const message = `error: unknown command '${this.args[0]}'. See '${fullCommand} ${this._helpLongFlag}'.`;
+    console.error(message);
+    this._exit(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
+   * @api public
+   */
+
+  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 = new Option(flags, description);
+    this._versionOptionName = versionOption.long.substr(2) || 'version';
+    this.options.push(versionOption);
+    this.on('option:' + this._versionOptionName, () => {
+      process.stdout.write(str + '\n');
+      this._exit(0, 'commander.version', str);
+    });
+    return this;
+  };
+
+  /**
+   * Set the description to `str`.
+   *
+   * @param {string} str
+   * @param {Object} [argsDescription]
+   * @return {string|Command}
+   * @api public
+   */
+
+  description(str, argsDescription) {
+    if (str === undefined && argsDescription === undefined) return this._description;
+    this._description = str;
+    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}
+   * @api public
+   */
+
+  alias(alias) {
+    if (alias === undefined) return this._aliases[0]; // just return first, for backwards compatibility
+
+    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}
+   * @api public
+   */
+
+  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}
+   * @api public
+   */
+
+  usage(str) {
+    if (str === undefined) {
+      if (this._usage) return this._usage;
+
+      const args = this._args.map((arg) => {
+        return humanReadableArgName(arg);
+      });
+      return '[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}
+   * @api public
+   */
+
+  name(str) {
+    if (str === undefined) return this._name;
+    this._name = str;
+    return this;
+  };
+
+  /**
+   * Return prepared commands.
+   *
+   * @return {Array}
+   * @api private
+   */
+
+  prepareCommands() {
+    const commandDetails = this.commands.filter((cmd) => {
+      return !cmd._hidden;
+    }).map((cmd) => {
+      const args = cmd._args.map((arg) => {
+        return humanReadableArgName(arg);
+      }).join(' ');
+
+      return [
+        cmd._name +
+          (cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
+          (cmd.options.length ? ' [options]' : '') +
+          (args ? ' ' + args : ''),
+        cmd._description
+      ];
+    });
+
+    if (this._lazyHasImplicitHelpCommand()) {
+      commandDetails.push([this._helpCommandnameAndArgs, this._helpCommandDescription]);
+    }
+    return commandDetails;
+  };
+
+  /**
+   * Return the largest command length.
+   *
+   * @return {number}
+   * @api private
+   */
+
+  largestCommandLength() {
+    const commands = this.prepareCommands();
+    return commands.reduce((max, command) => {
+      return Math.max(max, command[0].length);
+    }, 0);
+  };
+
+  /**
+   * Return the largest option length.
+   *
+   * @return {number}
+   * @api private
+   */
+
+  largestOptionLength() {
+    const options = [].slice.call(this.options);
+    options.push({
+      flags: this._helpFlags
+    });
+
+    return options.reduce((max, option) => {
+      return Math.max(max, option.flags.length);
+    }, 0);
+  };
+
+  /**
+   * Return the largest arg length.
+   *
+   * @return {number}
+   * @api private
+   */
+
+  largestArgLength() {
+    return this._args.reduce((max, arg) => {
+      return Math.max(max, arg.name.length);
+    }, 0);
+  };
+
+  /**
+   * Return the pad width.
+   *
+   * @return {number}
+   * @api private
+   */
+
+  padWidth() {
+    let width = this.largestOptionLength();
+    if (this._argsDescription && this._args.length) {
+      if (this.largestArgLength() > width) {
+        width = this.largestArgLength();
+      }
+    }
+
+    if (this.commands && this.commands.length) {
+      if (this.largestCommandLength() > width) {
+        width = this.largestCommandLength();
+      }
+    }
+
+    return width;
+  };
+
+  /**
+   * Return help for options.
+   *
+   * @return {string}
+   * @api private
+   */
+
+  optionHelp() {
+    const width = this.padWidth();
+    const columns = process.stdout.columns || 80;
+    const descriptionWidth = columns - width - 4;
+    function padOptionDetails(flags, description) {
+      return pad(flags, width) + '  ' + optionalWrap(description, descriptionWidth, width + 2);
+    };
+
+    // Explicit options (including version)
+    const help = this.options.map((option) => {
+      const fullDesc = option.description +
+        ((!option.negate && option.defaultValue !== undefined) ? ' (default: ' + JSON.stringify(option.defaultValue) + ')' : '');
+      return padOptionDetails(option.flags, fullDesc);
+    });
+
+    // Implicit help
+    const showShortHelpFlag = this._helpShortFlag && !this._findOption(this._helpShortFlag);
+    const showLongHelpFlag = !this._findOption(this._helpLongFlag);
+    if (showShortHelpFlag || showLongHelpFlag) {
+      let helpFlags = this._helpFlags;
+      if (!showShortHelpFlag) {
+        helpFlags = this._helpLongFlag;
+      } else if (!showLongHelpFlag) {
+        helpFlags = this._helpShortFlag;
+      }
+      help.push(padOptionDetails(helpFlags, this._helpDescription));
+    }
+
+    return help.join('\n');
+  };
+
+  /**
+   * Return command help documentation.
+   *
+   * @return {string}
+   * @api private
+   */
+
+  commandHelp() {
+    if (!this.commands.length && !this._lazyHasImplicitHelpCommand()) return '';
+
+    const commands = this.prepareCommands();
+    const width = this.padWidth();
+
+    const columns = process.stdout.columns || 80;
+    const descriptionWidth = columns - width - 4;
+
+    return [
+      'Commands:',
+      commands.map((cmd) => {
+        const desc = cmd[1] ? '  ' + cmd[1] : '';
+        return (desc ? pad(cmd[0], width) : cmd[0]) + optionalWrap(desc, descriptionWidth, width + 2);
+      }).join('\n').replace(/^/gm, '  '),
+      ''
+    ].join('\n');
+  };
+
+  /**
+   * Return program help documentation.
+   *
+   * @return {string}
+   * @api public
+   */
+
+  helpInformation() {
+    let desc = [];
+    if (this._description) {
+      desc = [
+        this._description,
+        ''
+      ];
+
+      const argsDescription = this._argsDescription;
+      if (argsDescription && this._args.length) {
+        const width = this.padWidth();
+        const columns = process.stdout.columns || 80;
+        const descriptionWidth = columns - width - 5;
+        desc.push('Arguments:');
+        desc.push('');
+        this._args.forEach((arg) => {
+          desc.push('  ' + pad(arg.name, width) + '  ' + wrap(argsDescription[arg.name], descriptionWidth, width + 4));
+        });
+        desc.push('');
+      }
+    }
+
+    let cmdName = this._name;
+    if (this._aliases[0]) {
+      cmdName = cmdName + '|' + this._aliases[0];
+    }
+    let parentCmdNames = '';
+    for (let parentCmd = this.parent; parentCmd; parentCmd = parentCmd.parent) {
+      parentCmdNames = parentCmd.name() + ' ' + parentCmdNames;
+    }
+    const usage = [
+      'Usage: ' + parentCmdNames + cmdName + ' ' + this.usage(),
+      ''
+    ];
+
+    let cmds = [];
+    const commandHelp = this.commandHelp();
+    if (commandHelp) cmds = [commandHelp];
+
+    const options = [
+      'Options:',
+      '' + this.optionHelp().replace(/^/gm, '  '),
+      ''
+    ];
+
+    return usage
+      .concat(desc)
+      .concat(options)
+      .concat(cmds)
+      .join('\n');
+  };
+
+  /**
+   * Output help information for this command.
+   *
+   * When listener(s) are available for the helpLongFlag
+   * those callbacks are invoked.
+   *
+   * @api public
+   */
+
+  outputHelp(cb) {
+    if (!cb) {
+      cb = (passthru) => {
+        return passthru;
+      };
+    }
+    const cbOutput = cb(this.helpInformation());
+    if (typeof cbOutput !== 'string' && !Buffer.isBuffer(cbOutput)) {
+      throw new Error('outputHelp callback must return a string or a Buffer');
+    }
+    process.stdout.write(cbOutput);
+    this.emit(this._helpLongFlag);
+  };
+
+  /**
+   * You can pass in flags and a description to override the help
+   * flags and help description for your command.
+   *
+   * @param {string} [flags]
+   * @param {string} [description]
+   * @return {Command} `this` command for chaining
+   * @api public
+   */
+
+  helpOption(flags, description) {
+    this._helpFlags = flags || this._helpFlags;
+    this._helpDescription = description || this._helpDescription;
+
+    const splitFlags = this._helpFlags.split(/[ ,|]+/);
+
+    this._helpShortFlag = undefined;
+    if (splitFlags.length > 1) this._helpShortFlag = splitFlags.shift();
+
+    this._helpLongFlag = splitFlags.shift();
+
+    return this;
+  };
+
+  /**
+   * Output help information and exit.
+   *
+   * @param {Function} [cb]
+   * @api public
+   */
+
+  help(cb) {
+    this.outputHelp(cb);
+    // exitCode: preserving original behaviour which was calling process.exit()
+    // message: do not have all displayed text available so only passing placeholder.
+    this._exit(process.exitCode || 0, 'commander.help', '(outputHelp)');
+  };
+
+  /**
+   * Output help information and exit. Display for error situations.
+   *
+   * @api private
+   */
+
+  _helpAndError() {
+    this.outputHelp();
+    // message: do not have all displayed text available so only passing placeholder.
+    this._exit(1, 'commander.help', '(outputHelp)');
+  };
+};
+
+/**
+ * Expose the root command.
+ */
+
+exports = module.exports = new Command();
+exports.program = exports; // More explicit access to global command.
+
+/**
+ * Expose classes
+ */
+
+exports.Command = Command;
+exports.Option = Option;
+exports.CommanderError = CommanderError;
+
+/**
+ * Camel-case the given `flag`
+ *
+ * @param {string} flag
+ * @return {string}
+ * @api private
+ */
+
+function camelcase(flag) {
+  return flag.split('-').reduce((str, word) => {
+    return str + word[0].toUpperCase() + word.slice(1);
+  });
+}
+
+/**
+ * Pad `str` to `width`.
+ *
+ * @param {string} str
+ * @param {number} width
+ * @return {string}
+ * @api private
+ */
+
+function pad(str, width) {
+  const len = Math.max(0, width - str.length);
+  return str + Array(len + 1).join(' ');
+}
+
+/**
+ * Wraps the given string with line breaks at the specified width while breaking
+ * words and indenting every but the first line on the left.
+ *
+ * @param {string} str
+ * @param {number} width
+ * @param {number} indent
+ * @return {string}
+ * @api private
+ */
+function wrap(str, width, indent) {
+  const regex = new RegExp('.{1,' + (width - 1) + '}([\\s\u200B]|$)|[^\\s\u200B]+?([\\s\u200B]|$)', 'g');
+  const lines = str.match(regex) || [];
+  return lines.map((line, i) => {
+    if (line.slice(-1) === '\n') {
+      line = line.slice(0, line.length - 1);
+    }
+    return ((i > 0 && indent) ? Array(indent + 1).join(' ') : '') + line.trimRight();
+  }).join('\n');
+}
+
+/**
+ * Optionally wrap the given str to a max width of width characters per line
+ * while indenting with indent spaces. Do not wrap if insufficient width or
+ * string is manually formatted.
+ *
+ * @param {string} str
+ * @param {number} width
+ * @param {number} indent
+ * @return {string}
+ * @api private
+ */
+function optionalWrap(str, width, indent) {
+  // 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 to narrow columns (or can end up with a word per line).
+  const minWidth = 40;
+  if (width < minWidth) return str;
+
+  return wrap(str, width, indent);
+}
+
+/**
+ * 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 = 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)');
+  }
+}
+
+/**
+ * Takes an argument and returns its human readable equivalent for help usage.
+ *
+ * @param {Object} arg
+ * @return {string}
+ * @api private
+ */
+
+function humanReadableArgName(arg) {
+  const nameOutput = arg.name + (arg.variadic === true ? '...' : '');
+
+  return arg.required
+    ? '<' + nameOutput + '>'
+    : '[' + nameOutput + ']';
+}
+
+/**
+ * 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) => {
+    let result = arg;
+    if (arg.indexOf('--inspect') === 0) {
+      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+)$/)) !== null) {
+        // e.g. --inspect=localhost:1234
+        debugOption = match[1];
+        debugHost = match[3];
+        debugPort = match[4];
+      }
+
+      if (debugOption && debugPort !== '0') {
+        result = `${debugOption}=${debugHost}:${parseInt(debugPort) + 1}`;
+      }
+    }
+    return result;
+  });
+}