prepack/lib/values/FunctionValue.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 = void 0;

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

var _invariant = _interopRequireDefault(require("../invariant.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * 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.
 */

/* Abstract base class for all function objects */
class FunctionValue extends _index.ObjectValue {
  constructor(realm, intrinsicName) {
    super(realm, realm.intrinsics.FunctionPrototype, intrinsicName);
  }

  getName() {
    throw new Error("Abstract method");
  }

  getKind() {
    return "Function";
  }

  getLength() {
    let binding = this.properties.get("length");
    (0, _invariant.default)(binding);
    let desc = binding.descriptor;
    (0, _invariant.default)(desc);
    let value = desc.throwIfNotConcrete(this.$Realm).value;
    if (!(value instanceof _index.NumberValue)) return undefined;
    return value.value;
  }

  hasDefaultLength() {
    (0, _invariant.default)(false, "abstract method; please override");
  }

  getDebugName() {
    return super.getDebugName() || this.getName();
  }

}

exports.default = FunctionValue;
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