70 lines
1.4 KiB
JavaScript
70 lines
1.4 KiB
JavaScript
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/*!
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* is-accessor-descriptor <https://github.com/jonschlinkert/is-accessor-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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// accessor descriptor properties
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var accessor = {
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get: 'function',
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set: 'function',
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configurable: 'boolean',
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enumerable: 'boolean'
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};
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function isAccessorDescriptor(obj, prop) {
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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 (typeOf(obj) !== 'object') {
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return false;
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}
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if (has(obj, 'value') || has(obj, 'writable')) {
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return false;
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}
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if (!has(obj, 'get') || typeof obj.get !== 'function') {
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return false;
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}
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// tldr: it's valid to have "set" be undefined
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// "set" might be undefined if `Object.getOwnPropertyDescriptor`
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// was used to get the value, and only `get` was defined by the user
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if (has(obj, 'set') && typeof obj[key] !== 'function' && typeof obj[key] !== 'undefined') {
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return false;
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}
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for (var key in obj) {
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if (!accessor.hasOwnProperty(key)) {
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continue;
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}
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if (typeOf(obj[key]) === accessor[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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function has(obj, key) {
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return {}.hasOwnProperty.call(obj, key);
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}
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/**
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* Expose `isAccessorDescriptor`
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*/
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module.exports = isAccessorDescriptor;
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