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43 lines
980 B
43 lines
980 B
/** |
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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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* |
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*/ |
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'use strict'; |
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/* eslint-disable fb-www/typeof-undefined */ |
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/* eslint-disable no-unused-vars */ |
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var invariant = require('./invariant'); |
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/** |
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* Checks if a value is empty. |
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*/ |
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function isEmpty(value) { |
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if (Array.isArray(value)) { |
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return value.length === 0; |
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} else if (typeof value === 'object') { |
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if (value) { |
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!(!isIterable(value) || value.size === undefined) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'isEmpty() does not support iterable collections.') : invariant(false) : void 0; |
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for (var _ in value) { |
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return false; |
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} |
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} |
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return true; |
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} else { |
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return !value; |
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} |
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} |
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function isIterable(value) { |
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if (typeof Symbol === 'undefined') { |
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return false; |
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} |
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return value[Symbol.iterator]; |
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} |
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module.exports = isEmpty; |