25 lines
562 B
JavaScript
25 lines
562 B
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule validateCallback
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* @flow
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*/
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'use strict';
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const invariant = require('fbjs/lib/invariant');
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function validateCallback(callback: ?Function) {
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invariant(
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!callback || typeof callback === 'function',
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'Invalid argument passed as callback. Expected a function. Instead ' +
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'received: %s',
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callback,
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);
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}
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module.exports = validateCallback;
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