angular-docs-cn/tools/yarn/check-yarn.js

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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
'use strict';
if (process.env.npm_execpath.indexOf('yarn') === -1) {
throw new Error(
'Please use Yarn instead of NPM to install dependencies. See: https://yarnpkg.com/lang/en/docs/install/');
}