Method fn

packages/core/test/acceptance/integration_spec.ts:3019–3021

(prefix: string, ...args: string[])

      foo = ['Frodo', 'Baggins'];

      fn(prefix: string, ...args: string[]) {
        return `${prefix}, ${args.join(' ')}`;
      }
    }

    const fixture = TestBed.createComponent(TestComponent);