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/** * Copyright (c) Facebook, Inc. and its affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ /** * This replicates lodash's once functionality for our purposes. */ module.exports = function(func) { let called = false; let result; return function(...args) { if (called) { return result; } called = true; return result = func.apply(this, args); }; };