mattermost-mobile/app/mm-redux/utils/key_mirror.ts
Miguel Alatzar 2d81b497cf [MM-23520] Port mattermost-redux (#4088)
* Remove mattermost-redux

* Move mm-redux files into app/redux

* Add @redux path to tsconfig.json

* Fix imports

* Install missing dependencies

* Fix tsc errors

* Fix i18n_utils test

* Fix more imports

* Remove redux websocket

* Fix tests

* Rename @redux

* Apply changes from mattermost-redux PR 1103

* Remove mattermost-redux mention in template

* Add missing imports

* Rename app/redux/ to app/mm-redux/

* Remove test file

* Fix fetching Sidebar GM profiles

Co-authored-by: Elias Nahum <nahumhbl@gmail.com>
2020-04-17 21:12:09 -07:00

44 lines
1.2 KiB
TypeScript

/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
/* eslint-disable header/header */
/**
* Constructs an enumeration with keys equal to their value.
*
* For example:
*
* var COLORS = keyMirror({blue: null, red: null});
* var myColor = COLORS.blue;
* var isColorValid = !!COLORS[myColor];
*
* The last line could not be performed if the values of the generated enum were
* not equal to their keys.
*
* Input: {key1: val1, key2: val2}
* Output: {key1: key1, key2: key2}
*
* @param {object} obj
* @return {object}
*/
export default function keyMirror<T extends {}>(obj: T): { [K in keyof T]: K } {
if (!(obj instanceof Object && !Array.isArray(obj))) {
throw new Error('keyMirror(...): Argument must be an object.');
}
const ret: any = {};
for (const key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
ret[key] = key;
}
return ret;
}