Emit changed example

[orta]

This looks like it might get merged soon: microsoft/TypeScript#39337

// @filename: service.ts
export class Service {}

// @filename: component.ts
 import type { Service } from "./service";

 declare var decorator: any;

 @decorator
 class MyComponent {
     constructor(public Service: Service) {
     }

     @decorator
     method(x: this) {
     }
 }

// @emitDecoratorMetadata
// @experimentalDecorators
// @showEmit
// @showEmittedFile: component.js

[typescript-bot]

It looks like something has changed with this repro on today's nightly build of TypeScript. You can see what has changed on TypeScript between 9a5c007 and 13693 here.

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Issue body code block by @orta

Before

After

👍 Compiled Emit: // @filename: service.ts export class Service {} // @filename: component.ts import type { Service } from "./service"; declare var decorator: any; @decorator class MyComponent { constructor(public Service: Service) { } @decorator method(x: this) { } } // @showEmit

👍 Compiled Emit: var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) { var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d; if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc); else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r; return c > 3 && r && Object.defineProperty(target, key, r), r; }; var __metadata = (this && this.__metadata) || function (k, v) { if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v); }; let MyComponent = class MyComponent { constructor(Service) { this.Service = Service; } method(x) { } }; __decorate([ decorator, __metadata("design:type", Function), __metadata("design:paramtypes", [Object]), __metadata("design:returntype", void 0) ], MyComponent.prototype, "method", null); MyComponent = __decorate([ decorator, __metadata("design:paramtypes", [Function]) ], MyComponent); export {};

[typescript-bot]

👋 Hi, I'm the Repro bot. I can help narrow down and track compiler bugs across releases! This comment reflects the current state of the repro in the issue body running against the nightly TypeScript.

---

Issue body code block by @orta

👍 Compiled
Emit:

var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
let MyComponent = class MyComponent {
    constructor(Service) {
        this.Service = Service;
    }
    method(x) {
    }
};
__decorate([
    decorator,
    __metadata("design:type", Function),
    __metadata("design:paramtypes", [Object]),
    __metadata("design:returntype", void 0)
], MyComponent.prototype, "method", null);
MyComponent = __decorate([
    decorator,
    __metadata("design:paramtypes", [Function])
], MyComponent);
export {};

Historical Information

Version

Reproduction Outputs

4.2.2, 4.3.2, 4.4.2, 4.5.2, 4.6.2

👍 Compiled Emit: var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) { var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d; if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc); else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r; return c > 3 && r && Object.defineProperty(target, key, r), r; }; var __metadata = (this && this.__metadata) || function (k, v) { if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v); }; let MyComponent = class MyComponent { constructor(Service) { this.Service = Service; } method(x) { } }; __decorate([ decorator, __metadata("design:type", Function), __metadata("design:paramtypes", [Object]), __metadata("design:returntype", void 0) ], MyComponent.prototype, "method", null); MyComponent = __decorate([ decorator, __metadata("design:paramtypes", [Function]) ], MyComponent); export {};