Improve error handling

lib/core/createError.js

@@ -0,0 +1,16 @@
+'use strict';
+
+var enhanceError = require('./enhanceError');
+
+/**
+ * Create an Error with the specified message, config, and optional error code.
+ *
+ * @param {string} message The error message.
+ * @param {Object} config The config object.
+ * @param {string} [code] The error code (for example, 'ECONNABORTED').
+ * @returns {Error} The created error.
+ */
+module.exports = function createError(message, config, code) {
+  var error = new Error(message);
+  return enhanceError(error, config, code);
+};