prepack/lib/intrinsics/ecma262/ErrorPrototype.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;
exports.build = build;

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

var _index2 = require("../../methods/index.js");

var _singletons = require("../../singletons.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, obj) {
  return build("Error", realm, obj);
}

function build(name, realm, obj) {
  // ECMA262 19.5.3.2
  obj.defineNativeProperty("message", realm.intrinsics.emptyString); // ECMA262 19.5.3.3

  obj.defineNativeProperty("name", new _index.StringValue(realm, name)); // ECMA262 19.5.3.4

  obj.defineNativeMethod("toString", 0, context => {
    // 1. Let O be the this value.
    let O = context.throwIfNotConcrete(); // 2. If Type(O) is not Object, throw a TypeError exception.

    if (!(O instanceof _index.ObjectValue)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    } // 3. Let name be ? Get(O, "name").


    let nameValue = (0, _index2.Get)(realm, O, "name"); // 4. If name is undefined, let name be "Error"; otherwise let name be ? ToString(name).

    let nameString = nameValue instanceof _index.UndefinedValue ? "Error" : _singletons.To.ToStringPartial(realm, nameValue); // 5. Let msg be ? Get(O, "message").

    let msg = (0, _index2.Get)(realm, O, "message"); // 6. If msg is undefined, let msg be the empty String; otherwise let msg be ? ToString(msg).

    msg = msg instanceof _index.UndefinedValue ? "" : _singletons.To.ToStringPartial(realm, msg); // Note that in ES5, both name and msg are checked for emptiness in step 7,
    // which however is later dropped in ES6.
    // 7. If name is the empty String, return msg.

    if (nameString === "") return new _index.StringValue(realm, msg); // 8. If msg is the empty String, return name.

    if (msg === "") return new _index.StringValue(realm, nameString); // 9. Return the result of concatenating name, the code unit 0x003A (COLON), the code unit 0x0020 (SPACE), and msg.

    return new _index.StringValue(realm, `${nameString}: ${msg}`);
  });
}
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