prepack/lib/intrinsics/ecma262/ArrayProto_values.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;

var _index = require("../../values/index.js");

var _singletons = require("../../singletons.js");

var _generator = require("../../utils/generator.js");

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

/*  strict-local */
function _default(realm) {
  // ECMA262 22.1.3.30
  return new _index.NativeFunctionValue(realm, "Array.prototype.values", "values", 0, context => {
    // 1. Let O be ? ToObject(this value).
    let O = _singletons.To.ToObject(realm, context); // If we have an object that is an array with widened numeric properties, then
    // we can return a temporal here as we know nothing of the array's properties.
    // This should be safe to do, as we never expose the internals of the array.


    if (_index.ArrayValue.isIntrinsicAndHasWidenedNumericProperty(O) && realm.isInPureScope() && O.$GetOwnProperty("values") === undefined) {
      return _index.AbstractValue.createTemporalFromBuildFunction(realm, _index.Value, [O, new _index.StringValue(realm, "values")], (0, _generator.createOperationDescriptor)("UNKNOWN_ARRAY_METHOD_PROPERTY_CALL"));
    } // 2. Return CreateArrayIterator(O, "value").


    return _singletons.Create.CreateArrayIterator(realm, O.throwIfNotConcreteObject(), "value");
  });
}
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