yarn-run-all/bin/common/bootstrap.js

A CLI tool to run multiple npm-scripts in parallel or sequential.

/**
 * @author Toru Nagashima
 * @copyright 2016 Toru Nagashima. All rights reserved.
 * See LICENSE file in root directory for full license.
 */
"use strict";

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

/**
 * Define the function for main process.
 *
 * @param {string} name - A program name.
 * @returns {function} The function for main process.
 */

function defineMain(name) {
    /**
     * The main process of `npm-run-all` command.
     *
     * @param {string[]} args - Arguments to parse.
     * @param {stream.Writable} stdout - A writable stream to print logs.
     * @param {stream.Writable} stderr - A writable stream to print errors.
     * @returns {Promise} A promise which comes to be fulfilled when all
     *      npm-scripts are completed.
     * @private
     */
    return function main(args) {
        var stdout = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
        var stderr = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        switch (args[0]) {
            case undefined:
            case "-h":
            case "--help":
                return require("../" + name + "/help")(stdout);

            case "-v":
            case "--version":
                return require("./version")(stdout);

            default:
                return require("../" + name + "/main")(args, stdout, stderr);
        }
    };
}

//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------

module.exports = function bootstrap(entryModule, name) {
    var main = entryModule.exports = defineMain(name);

    /* eslint-disable no-console, no-process-exit */
    /* istanbul ignore if */
    if (require.main === entryModule) {
        // Execute.
        var promise = main(process.argv.slice(2), process.stdout, process.stderr);

        // Error Handling.
        promise.then(function () {
            // I'm not sure why, but maybe the process never exits
            // on Git Bash (MINGW64)
            process.exit(0);
        }, function (err) {
            console.error("ERROR:", err.message);
            process.exit(1);
        });
    }
};