Angular 2 RC6: cli-compiler says "function calls are not supported"

Question

When trying to compile my RC6 app using the following command:

ngc -p C:\Path\To\Project

(I am placed inside C:\Path\To\Project\node_modules\.bin when I'm running the command)

I get the following error:

Error encountered resolving symbol values statically. Function calls are not supported. Consider replacing the function or lambda with a reference to an exported function (position 20:25 in the original .ts file), resolving symbol CoreModule in C:/Path/To/Project/app/modules/core/core.module.ts

This is what it complains about:

@NgModule({
imports: [
    CommonModule,
    TranslateModule.forRoot({ 
        provide: TranslateLoader,
        useFactory: (http: Http) => new TranslateStaticLoader(http, 'app/languages', '.json'),
        deps: [Http]
    })
],

If I remove TranslateModule.forRoot... the error disappears.

How do I replace this with an exported function as the error implies?

Answer 1

I'm having some luck doing this:

export function translateStaticLoaderFactory(http: Http) {
  return new TranslateStaticLoader(http, 'app/languages', '.json');
}

@NgModule({
imports: [
    CommonModule,
    TranslateModule.forRoot({ 
        provide: TranslateLoader,
        useFactory: translateStaticLoaderFactory,
        deps: [Http]
    })
],