48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
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'use strict';
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var keys = require('object-keys');
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var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
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var toStr = Object.prototype.toString;
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var concat = Array.prototype.concat;
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var defineDataProperty = require('define-data-property');
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var isFunction = function (fn) {
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return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
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};
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var supportsDescriptors = require('has-property-descriptors')();
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var defineProperty = function (object, name, value, predicate) {
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if (name in object) {
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if (predicate === true) {
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if (object[name] === value) {
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return;
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}
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} else if (!isFunction(predicate) || !predicate()) {
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return;
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}
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}
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if (supportsDescriptors) {
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defineDataProperty(object, name, value, true);
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} else {
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defineDataProperty(object, name, value);
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}
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};
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var defineProperties = function (object, map) {
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var predicates = arguments.length > 2 ? arguments[2] : {};
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var props = keys(map);
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if (hasSymbols) {
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props = concat.call(props, Object.getOwnPropertySymbols(map));
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}
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for (var i = 0; i < props.length; i += 1) {
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defineProperty(object, props[i], map[props[i]], predicates[props[i]]);
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}
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};
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defineProperties.supportsDescriptors = !!supportsDescriptors;
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module.exports = defineProperties;
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