The function cannot be called because the type does not have the appropriate signature for invoking. The specific type lacks compatible call signatures, as indicated

Encountering an issue while attempting to utilize a getter and setter in my service, resulting in the following error message:

Cannot invoke an expression whose type lacks a call signature. Type 'Boolean' has no compatible call signatures 2349

toggleNav(): void {
    this.sidebarService.sidebarStatus.pipe(
        concatMap((bool: boolean) => this.sidebarService.updateStatus(bool))
    );
}

Despite researching on various SO pages, I have yet to come across a straightforward explanation for this error. Can someone provide a simple explanation of what this error signifies?

Below are the relevant setters and getters:

private _sidebarStatus = new BehaviorSubject<boolean>(true);

public get sidebarStatus(): Observable<boolean> {
    return this._sidebarStatus.asObservable();
}
public set updateStatus(bool: boolean) {
    this._sidebarStatus.next(bool);
}

Answer №1

If you plan to utilize properties (defined with get/set), then all you need to do is assign the property when you want to set it, and the setter will be automatically called.

this.sidebarService.sidebarStatus.pipe(
    concatMap((bool: boolean) => this.sidebarService.updateStatus = bool)
);

The error message you're seeing is because the compiler interprets this.sidebarService.updateStatus as a boolean field (which is correct; get/set functions are just an implementation detail, and properties are syntactically similar to fields), hence you cannot call a boolean value.

An alternative approach is to remove the set declaration, allowing you to directly call updateStatus as if it were a regular method instead of a property setter:

public updateStatus(bool: boolean) {
    this._sidebarStatus.next(bool);
}
this.sidebarService.sidebarStatus.pipe(
    concatMap((bool: boolean) => this.sidebarService.updateStatus(bool)) // now works fine
);

To learn more about property accessors, visit this link under the Accessors section.

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