59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var keys = require('object-keys');
|
||
|
|
var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
|
||
|
|
|
||
|
|
var toStr = Object.prototype.toString;
|
||
|
|
var concat = Array.prototype.concat;
|
||
|
|
var origDefineProperty = Object.defineProperty;
|
||
|
|
|
||
|
|
var isFunction = function (fn) {
|
||
|
|
return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
|
||
|
|
};
|
||
|
|
|
||
|
|
var arePropertyDescriptorsSupported = function () {
|
||
|
|
var obj = {};
|
||
|
|
try {
|
||
|
|
origDefineProperty(obj, 'x', { enumerable: false, value: obj });
|
||
|
|
// eslint-disable-next-line no-unused-vars, no-restricted-syntax
|
||
|
|
for (var _ in obj) { // jscs:ignore disallowUnusedVariables
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return obj.x === obj;
|
||
|
|
} catch (e) { /* this is IE 8. */
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported();
|
||
|
|
|
||
|
|
var defineProperty = function (object, name, value, predicate) {
|
||
|
|
if (name in object && (!isFunction(predicate) || !predicate())) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (supportsDescriptors) {
|
||
|
|
origDefineProperty(object, name, {
|
||
|
|
configurable: true,
|
||
|
|
enumerable: false,
|
||
|
|
value: value,
|
||
|
|
writable: true
|
||
|
|
});
|
||
|
|
} else {
|
||
|
|
object[name] = value;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
var defineProperties = function (object, map) {
|
||
|
|
var predicates = arguments.length > 2 ? arguments[2] : {};
|
||
|
|
var props = keys(map);
|
||
|
|
if (hasSymbols) {
|
||
|
|
props = concat.call(props, Object.getOwnPropertySymbols(map));
|
||
|
|
}
|
||
|
|
for (var i = 0; i < props.length; i += 1) {
|
||
|
|
defineProperty(object, props[i], map[props[i]], predicates[props[i]]);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
defineProperties.supportsDescriptors = !!supportsDescriptors;
|
||
|
|
|
||
|
|
module.exports = defineProperties;
|