Changing the target in tsconfig.json to "es2022" leads to the error message "Property 'xx' is referenced before its initialization.ts(2729)"

My Angular code is filled with instances where I assign a property at its definition like this...

 public data$ = this.service$.fetchData;

 constructor(private service$: MyService

However, after updating my tsconfig.json target to "es2022", I encountered the error

Property 'service$' is used before its initialization.ts(2729)

Is it still acceptable to assign properties at declaration in this scenario?

Answer №1

It is uncertain whether store$ will be filled before or after errors$.
A general guideline is to initialize straightforward properties within the declaration, but when it relies on something else, do so in the constructor.

public errors$: Observable<Foo>;

constructor(private store$: Store<MyState>) {
   this.errors$ = this.store$.select(fromApp.getErrors);
}

In this scenario, it can be confirmed that store$ is filled before errors$.

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