Angular/Typescript: develop a factory function that creates objects based on the parent class's properties

I'm currently working on implementing a factory method that can return classes dynamically, and here's my code snippet:

getWidget<T extends WidgetBase>(componentName: string): Type<T> {
    switch (componentName) {
        default:
            throw new Error(`Widget ${componentName} is not registered in the system`);
        case "Widget2":
            return Widget2Component;
    }
}

In this code block, Widget2Component is a class defined in another file as an Angular component that inherits from WidgetBase, which is an abstract class. Additionally, Type<T> is an Angular interface structured like so:

interface Type<T> extends Function {
    new (...args: any[]): T
}

After compiling, I encountered the following error message:

Type 'typeof Widget2Component' is not assignable to type 'Type<T>'. Type 'Widget2Component' is not assignable to type 'T'.

This issue has been puzzling me because Widget2Component does indeed extend WidgetBase!

Answer №1

After considering Titian's input in the feedback section, I have made adjustments to my approach:

fetchComponent(widgetName: string): Component<BaseWidget> {
    switch (widgetName) {
        default:
            throw new Error(`Widget ${widgetName} is not recognized`);
        case "SpecialWidget":
            return SpecialWidgetComponent;
        case "NewWidget":
            return NewWidgetComponent;
    }
}

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