Issue with systemjs and decorators

[subesokun]

Hi, I'm using TSC 1.5.3 (latest head) and I'm trying to compile following piece of code

@SomeDecorator()
export class App {
  constructor() {
  }
}

{"compilerOptions": {
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "module": "system",
    "target": "es5"
}}

which will then produce following code

var __decorate = ...;
var __metadata = ...;
System.register([], function(exports_1) { ... };

Now this doesn't really play nice together with systemjs and it works for me only when manually moving the var __decorate and var __metadata declarations into the anonymous function function(exports_1) { ..here... }. Not sure if it's really valid to have these variable declarations outside of the System.register.

[subesokun]

It seems like these declarations outside of System.register are crashing the format detection of systemjs. When adding manually a meta override as workaround like the following it's working again.

System.config({
  "meta": {
    "app.js": {
      "format": "register"
    }
  }
});

(please note that these metadata overrides are first available starting from SystemJS 0.17.0)

[mhegazy]

looks like a duplicate of #3364

[subesokun]

Thanks for the pointer, yes looks like a duplicate of #3364