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/** * Copyright (c) 2013-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @providesModule emptyFunction * @flow */ export type FunctionReturning<+T> = (...args: $ReadOnlyArray<mixed>) => T; export type EmptyFunctionType = { thatReturns: <T>(x: T) => FunctionReturning<T>, thatReturnsFalse: FunctionReturning<false>, thatReturnsTrue: FunctionReturning<true>, thatReturnsNull: FunctionReturning<null>, thatReturnsThis: FunctionReturning<mixed>, thatReturnsArgument: <T>(x: T) => T, (...args: $ReadOnlyArray<mixed>): void, }; function makeEmptyFunction<T>(arg: T): (...args: Array<any>) => T { return function () { return arg; }; } /** * This function accepts and discards inputs; it has no side effects. This is * primarily useful idiomatically for overridable function endpoints which * always need to be callable, since JS lacks a null-call idiom ala Cocoa. */ const emptyFunction = function () {}; emptyFunction.thatReturns = makeEmptyFunction; emptyFunction.thatReturnsFalse = makeEmptyFunction(false); emptyFunction.thatReturnsTrue = makeEmptyFunction(true); emptyFunction.thatReturnsNull = makeEmptyFunction(null); emptyFunction.thatReturnsThis = function () { return this; }; emptyFunction.thatReturnsArgument = function (arg) { return arg; }; module.exports = (emptyFunction: EmptyFunctionType);
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