source: trip-planner-front/node_modules/@babel/plugin-transform-classes/lib/inline-createSuper-helpers.js

Last change on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.3 KB
Line 
1"use strict";
2
3Object.defineProperty(exports, "__esModule", {
4 value: true
5});
6exports.default = addCreateSuperHelper;
7
8var _core = require("@babel/core");
9
10const helperIDs = new WeakMap();
11
12function addCreateSuperHelper(file) {
13 if (helperIDs.has(file)) {
14 return (_core.types.cloneNode || _core.types.clone)(helperIDs.get(file));
15 }
16
17 try {
18 return file.addHelper("createSuper");
19 } catch (_unused) {}
20
21 const id = file.scope.generateUidIdentifier("createSuper");
22 helperIDs.set(file, id);
23 const fn = helper({
24 CREATE_SUPER: id,
25 GET_PROTOTYPE_OF: file.addHelper("getPrototypeOf"),
26 POSSIBLE_CONSTRUCTOR_RETURN: file.addHelper("possibleConstructorReturn")
27 });
28 file.path.unshiftContainer("body", [fn]);
29 file.scope.registerDeclaration(file.path.get("body.0"));
30 return _core.types.cloneNode(id);
31}
32
33const helper = _core.template.statement`
34 function CREATE_SUPER(Derived) {
35 function isNativeReflectConstruct() {
36 if (typeof Reflect === "undefined" || !Reflect.construct) return false;
37
38 // core-js@3
39 if (Reflect.construct.sham) return false;
40
41 // Proxy can't be polyfilled. Every browser implemented
42 // proxies before or at the same time as Reflect.construct,
43 // so if they support Proxy they also support Reflect.construct.
44 if (typeof Proxy === "function") return true;
45
46 // Since Reflect.construct can't be properly polyfilled, some
47 // implementations (e.g. core-js@2) don't set the correct internal slots.
48 // Those polyfills don't allow us to subclass built-ins, so we need to
49 // use our fallback implementation.
50 try {
51 // If the internal slots aren't set, this throws an error similar to
52 // TypeError: this is not a Date object.
53 Date.prototype.toString.call(Reflect.construct(Date, [], function() {}));
54 return true;
55 } catch (e) {
56 return false;
57 }
58 }
59
60 return function () {
61 var Super = GET_PROTOTYPE_OF(Derived), result;
62 if (isNativeReflectConstruct()) {
63 // NOTE: This doesn't work if this.__proto__.constructor has been modified.
64 var NewTarget = GET_PROTOTYPE_OF(this).constructor;
65 result = Reflect.construct(Super, arguments, NewTarget);
66 } else {
67 result = Super.apply(this, arguments);
68 }
69 return POSSIBLE_CONSTRUCTOR_RETURN(this, result);
70 }
71 }
72`;
Note: See TracBrowser for help on using the repository browser.