Issue encountered when trying to export a function that returns a class: The exported variable either contains or is utilizing a private name

Encountered an issue

Error TS4025: Exported variable 'UserApiClientModule' has or is using private name 'UserApiClient'.

Here's the code causing the error:

export var UserApiClientModule = {
  fromConfiguration: (configuration: Configuration) => {
    @NgModule({
      providers: [
        {
          provide: BASE_PATH,
          useValue: basePath
        },
        {
          provide: Configuration,
          useValue: configuration
        },
        RegistrationApi,
        AuthApi,
        AccountApi,
        ContactsApi,
        ContactOrgsApi
      ],
      imports: [
        CommonModule,
        HttpModule
      ]
    })
    class UserApiClient { }

    return UserApiClient;
  }
}

The potential solution might involve exporting the type UserApiClient in a different manner due to its declaration within a function.

Answer №1

One important aspect to note is:

Typescript makes an attempt to determine the returned type of all public components. It not only tries to infer, but explicitly declares the UserApiClient as a part of the returned type from the fromConfiguration function call.

The issue arises when we return something that is internal and not exported. However, this can be resolved by returning something else, such as a common interface, or perhaps using the generic type any.

// Before
export var UserApiClientModule = {
  fromConfiguration: (configuration: Configuration) => {
    @NgModule({
    ...


// After
export var UserApiClientModule = {                // Change made below
  fromConfiguration: (configuration: Configuration) : any => {
    @NgModule({
    ...

It would be beneficial to define a common interface like IHaveDynamicData, similar to how it was done in a related scenario discussed here How can I use/create dynamic template to compile dynamic Component with Angular 2.0?

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