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72 lines
2.3 KiB
72 lines
2.3 KiB
5 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = addCreateSuperHelper;
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var _core = require("@babel/core");
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const helperIDs = new WeakMap();
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function addCreateSuperHelper(file) {
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if (helperIDs.has(file)) {
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return (_core.types.cloneNode || _core.types.clone)(helperIDs.get(file));
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}
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try {
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return file.addHelper("createSuper");
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} catch (_unused) {}
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const id = file.scope.generateUidIdentifier("createSuper");
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helperIDs.set(file, id);
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const fn = helper({
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CREATE_SUPER: id,
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GET_PROTOTYPE_OF: file.addHelper("getPrototypeOf"),
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POSSIBLE_CONSTRUCTOR_RETURN: file.addHelper("possibleConstructorReturn")
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});
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file.path.unshiftContainer("body", [fn]);
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file.scope.registerDeclaration(file.path.get("body.0"));
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return _core.types.cloneNode(id);
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}
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const helper = _core.template.statement`
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function CREATE_SUPER(Derived) {
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function isNativeReflectConstruct() {
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if (typeof Reflect === "undefined" || !Reflect.construct) return false;
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// core-js@3
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if (Reflect.construct.sham) return false;
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// Proxy can't be polyfilled. Every browser implemented
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// proxies before or at the same time as Reflect.construct,
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// so if they support Proxy they also support Reflect.construct.
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if (typeof Proxy === "function") return true;
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// Since Reflect.construct can't be properly polyfilled, some
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// implementations (e.g. core-js@2) don't set the correct internal slots.
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// Those polyfills don't allow us to subclass built-ins, so we need to
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// use our fallback implementation.
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try {
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// If the internal slots aren't set, this throws an error similar to
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// TypeError: this is not a Date object.
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Date.prototype.toString.call(Reflect.construct(Date, [], function() {}));
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return true;
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} catch (e) {
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return false;
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}
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}
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return function () {
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var Super = GET_PROTOTYPE_OF(Derived), result;
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if (isNativeReflectConstruct()) {
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// NOTE: This doesn't work if this.__proto__.constructor has been modified.
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var NewTarget = GET_PROTOTYPE_OF(this).constructor;
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result = Reflect.construct(Super, arguments, NewTarget);
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} else {
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result = Super.apply(this, arguments);
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}
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return POSSIBLE_CONSTRUCTOR_RETURN(this, result);
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}
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}
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`;
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