routie dev init since i didn't adhere to any proper guidance up until now

frontend/node_modules/npm-run-all2/lib/npm-run-all-error.js

@@ -0,0 +1,47 @@
+/**
+ * @module npm-run-all-error
+ * @author Toru Nagashima
+ * @copyright 2016 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Public Interface
+// ------------------------------------------------------------------------------
+
+/**
+ * Error object with some additional info.
+ */
+module.exports = class NpmRunAllError extends Error {
+  /**
+     * Constructor.
+     *
+     * @param {{name: string, code: number}} causeResult -
+     *      The result item of the npm-script which causes an error.
+     * @param {Array.<{name: string, code: (number|undefined)}>} allResults -
+     *      All result items of npm-scripts.
+     */
+  constructor (causeResult, allResults) {
+    super(`"${causeResult.task}" exited with ${causeResult.code}.`)
+
+    /**
+         * The name of a npm-script which exited with a non-zero code.
+         * @type {string}
+         */
+    this.name = causeResult.name
+
+    /**
+         * The code of a npm-script which exited with a non-zero code.
+         * This can be `undefined`.
+         * @type {number}
+         */
+    this.code = causeResult.code
+
+    /**
+         * All result items of npm-scripts.
+         * @type {Array.<{name: string, code: (number|undefined)}>}
+         */
+    this.results = allResults
+  }
+}