commit

node_modules/failure/index.js

@@ -0,0 +1,53 @@
+'use strict';
+
+var has = Object.prototype.hasOwnProperty;
+
+/**
+ * Return an object with all the information that should be in the JSON output.
+ * It doesn't matter if we list keys that might not be in the err as the
+ * JSON.stringify will remove properties who's values are set to `undefined`. So
+ * we want to make sure that we include some common properties.
+ *
+ * @returns {Object}
+ * @api public
+ */
+function toJSON() {
+  var obj =  { message: this.message, stack: this.stack }, key;
+
+  for (key in this) {
+    if (
+         has.call(this, key)
+      && 'function' !== typeof this[key]
+    ) {
+      obj[key] = this[key];
+    }
+  }
+
+  return obj;
+}
+
+/**
+ * Generate a custom wrapped error object.
+ *
+ * @param {String|Error} err Error that needs to have additional properties.
+ * @param {Object} props Addition properties for the Error.
+ * @returns {Error} The generated or returned Error instance
+ * @api public
+ */
+module.exports = function failure(err, props) {
+  if (!err) err = 'Unspecified error';
+  if ('string' === typeof err) err = new Error(err);
+
+  if (props) for (var prop in props) {
+    if (!(prop in err) && has.call(props, prop)) {
+      err[prop] = props[prop];
+    }
+  }
+
+  //
+  // Add a custom `toJSON` method so we can generate a useful output when
+  // running these objects through JSON.stringify.
+  //
+  if ('function' !== typeof err.toJSON) err.toJSON = toJSON;
+  return err;
+};