49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
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'use strict';
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var AddEntriesFromIterable = require('es-abstract/2019/AddEntriesFromIterable');
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var CreateDataPropertyOrThrow = require('es-abstract/2019/CreateDataPropertyOrThrow');
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var Get = require('es-abstract/2019/Get');
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var IsArray = require('es-abstract/2019/IsArray');
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var RequireObjectCoercible = require('es-abstract/2019/RequireObjectCoercible');
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var ToPropertyKey = require('es-abstract/2019/ToPropertyKey');
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var Type = require('es-abstract/2019/Type');
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var adder = function addDataProperty(key, value) {
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var O = this; // eslint-disable-line no-invalid-this
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var propertyKey = ToPropertyKey(key);
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CreateDataPropertyOrThrow(O, propertyKey, value);
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};
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var legacyAssign = function assign(obj, entries) {
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for (var i = 0; i < entries.length; ++i) {
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var entry = entries[i];
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if (Type(entry) !== 'Object') {
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throw new TypeError('iterator returned a non-object; entry expected');
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}
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var key = Get(entry, '0');
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var value = Get(entry, '1');
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var propertyKey = ToPropertyKey(key);
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CreateDataPropertyOrThrow(obj, propertyKey, value);
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}
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};
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var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
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module.exports = function fromEntries(iterable) {
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RequireObjectCoercible(iterable);
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var obj = {};
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// this part isn't in the spec, it's for a reasonable fallback for pre-ES6 environments
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if (!hasSymbols) {
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if (!IsArray(iterable)) {
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throw new TypeError('this environment lacks native Symbols, and can not support non-Array iterables');
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}
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legacyAssign(obj, iterable);
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return obj;
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}
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return AddEntriesFromIterable(obj, iterable, adder);
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};
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