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

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?

you have to update ng2-translate to >5.0.0 first of all. I had the same issue on version ~2.5.0 and exported function did not help.

So your steps:

1. Update version >5.0.0
2. Export function as mentioned by Isaac:

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

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