Issue with Angular Provider Missing in Ahead-Of-Time Compilation

My goal is to simplify the declaration of a provider by using a static function in this way:

const provider = MyModule.configureProvider();

@NgModule({
  bootstrap: [AppComponent],
  declarations: [AppComponent],
  imports: [
     ...
  ],
  providers: [
    provider,
    ...
  ],
})

Unfortunately, I encountered an issue with AOT where the provider was missing.

However, when I use the following approach, everything works correctly:

const providers = [{provide : myToken, useValue: "value"}];

@NgModule({
  bootstrap: [AppComponent],
  declarations: [AppComponent],
  imports: [
     ...
  ],
  providers: [
    provider,
    ...
  ],
})
angulartypescriptangular2-aot

Answer №1

A module must declare and use elements that are statically analyzable for AOT compilation to function correctly. Check out this resource for more details.

What exactly does "statically analyzable" mean? It means that another program can determine the value of certain elements without having to execute a function, as it can be deduced from the code itself. For example, you cannot predict the return value of a function due to the well-known Halting Problem.

If functions need to be executed in order to retrieve providers, the AOT compiler will encounter issues. This concept also extends to dynamic templates and CSS style declarations.

Answer №2

To solve the issue, I implemented a workaround by including a static function within my module. This function is designed to return a ModuleWithProviders in the following manner:

import { NgModule, ModuleWithProviders } from '@angular/core';

// ....

public static withValue(value: string): ModuleWithProviders {
  return {
    ngModule: MyModule,
    providers: [
      { provide: MY_TOKEN, useValue: value},
    ],
};

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