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 wxy
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/*!
* is-accessor-descriptor <https://github.com/jonschlinkert/is-accessor-descriptor>
*
* Copyright (c) 2015, Jon Schlinkert.
* Licensed under the MIT License.
*/
'use strict';
var typeOf = require('kind-of');
// accessor descriptor properties
var accessor = {
get: 'function',
set: 'function',
configurable: 'boolean',
enumerable: 'boolean'
};
function isAccessorDescriptor(obj, prop) {
if (typeof prop === 'string') {
var val = Object.getOwnPropertyDescriptor(obj, prop);
return typeof val !== 'undefined';
}
if (typeOf(obj) !== 'object') {
return false;
}
if (has(obj, 'value') || has(obj, 'writable')) {
return false;
}
if (!has(obj, 'get') || typeof obj.get !== 'function') {
return false;
}
// tldr: it's valid to have "set" be undefined
// "set" might be undefined if `Object.getOwnPropertyDescriptor`
// was used to get the value, and only `get` was defined by the user
if (has(obj, 'set') && typeof obj[key] !== 'function' && typeof obj[key] !== 'undefined') {
return false;
}
for (var key in obj) {
if (!accessor.hasOwnProperty(key)) {
continue;
}
if (typeOf(obj[key]) === accessor[key]) {
continue;
}
if (typeof obj[key] !== 'undefined') {
return false;
}
}
return true;
}
function has(obj, key) {
return {}.hasOwnProperty.call(obj, key);
}
/**
* Expose `isAccessorDescriptor`
*/
module.exports = isAccessorDescriptor;
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