Prevent or warn when an action class is used multiple times in a store

[tfriem]

When an action class is used in multiple action decorators on the same store, only one of the decorated methods is being called for this action. While the limitation itself makes sense, an error or warning would make it easier to detect bugs related to this.

Example:

@Store({
})
export class ExampleStore {
  @Action(ExampleAction)
  load(state: AppState, action: ExampleAction) {
    alert('Message 1');
  }

  @Action(ExampleAction)
  load(state: AppState, action: ExampleAction) {
    alert('Message 2');
  }
}

Only "Message 2" will be shown when ExampleAction is dispatched.

My experience with decorators in Typescript is limited, but if it's okay, I would try myself on a PR for this.

[amcdnl]

Absolutely. The check would somewhere around here - https://github.com/amcdnl/ngrx-actions/blob/master/src/action.ts#L12