Function factory

tfjs-core/src/engine_test.ts:61–68

()

  it('removeBackend disposes the backend and removes the factory', () => {
    let backend: KernelBackend;
    const factory = () => {
      const newBackend = new TestKernelBackend();
      if (backend == null) {
        backend = newBackend;
        spyOn(backend, 'dispose').and.callThrough();
      }
      return newBackend;
    };

    registerBackend('test-backend', factory);