prepack/lib/intrinsics/ecma262/Proxy.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 = function (realm) {
  // ECMA262 26.2.1.1
  let func = new _index.NativeFunctionValue(realm, "Proxy", "Proxy", 2, (context, [target, handler], argCount, NewTarget) => {
    // 1. If NewTarget is undefined, throw a TypeError exception.
    if (!NewTarget) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    }

    // 2. Return ? ProxyCreate(target, handler).
    return (0, _proxy.ProxyCreate)(realm, target, handler);
  });

  // ECMA262 26.2.2.1
  func.defineNativeMethod("revocable", 2, (context, [target, handler]) => {
    // 1. Let p be ? ProxyCreate(target, handler).
    let p = (0, _proxy.ProxyCreate)(realm, target, handler);

    // 2. Let revoker be a new built-in function object as defined in 26.2.2.1.1.
    let revoker = createRevoker();

    // 3. Set the [[RevocableProxy]] internal slot of revoker to p.
    revoker.$RevocableProxy = p;

    // 4. Let result be ObjectCreate(%ObjectPrototype%).
    let result = _singletons.Create.ObjectCreate(realm, realm.intrinsics.ObjectPrototype);

    // 5. Perform CreateDataProperty(result, "proxy", p).
    _singletons.Create.CreateDataProperty(realm, result, "proxy", p);

    // 6. Perform CreateDataProperty(result, "revoke", revoker).
    _singletons.Create.CreateDataProperty(realm, result, "revoke", revoker);

    // 7. Return result.
    return result;
  });

  function createRevoker() {
    let F = new _index.NativeFunctionValue(realm, undefined, undefined, 0, (context, [target, handler], argCount, NewTarget) => {
      // 1. Let p be the value of F's [[RevocableProxy]] internal slot.
      let p = F.$RevocableProxy;

      // 2. If p is null, return undefined.
      if (p instanceof _index.NullValue) return realm.intrinsics.undefined;

      // 3. Set the value of F's [[RevocableProxy]] internal slot to null.
      F.$RevocableProxy = realm.intrinsics.null;

      // 4. Assert: p is a Proxy object.
      (0, _invariant2.default)(p instanceof _index.ProxyValue, "expected proxy");

      // 5. Set the [[ProxyTarget]] internal slot of p to null.
      p.$ProxyTarget = realm.intrinsics.null;

      // 6. Set the [[ProxyHandler]] internal slot of p to null.
      p.$ProxyHandler = realm.intrinsics.null;

      // 7. Return undefined.
      return realm.intrinsics.undefined;
    }, false);

    return F;
  }

  return func;
};

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

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

var _proxy = require("../../methods/proxy.js");

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

var _invariant2 = _interopRequireDefault(_invariant);

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