49 lines
949 B
JavaScript
49 lines
949 B
JavaScript
/*!
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* is-data-descriptor <https://github.com/jonschlinkert/is-data-descriptor>
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*
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* Copyright (c) 2015-2017, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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var typeOf = require('kind-of');
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module.exports = function isDataDescriptor(obj, prop) {
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// data descriptor properties
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var data = {
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configurable: 'boolean',
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enumerable: 'boolean',
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writable: 'boolean'
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};
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if (typeOf(obj) !== 'object') {
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return false;
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}
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if (typeof prop === 'string') {
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var val = Object.getOwnPropertyDescriptor(obj, prop);
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return typeof val !== 'undefined';
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}
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if (!('value' in obj) && !('writable' in obj)) {
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return false;
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}
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for (var key in obj) {
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if (key === 'value') continue;
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if (!data.hasOwnProperty(key)) {
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continue;
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}
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if (typeOf(obj[key]) === data[key]) {
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continue;
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}
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if (typeof obj[key] !== 'undefined') {
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return false;
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}
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}
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return true;
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};
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