Leveraging the ReturnType from a method within a Child class that inherits from an abstract class

I'm encountering an issue where TypeScript is throwing a lot of errors when trying to utilize the ReturnType of a method from an abstract class in a child class.

Here's a simple example that illustrates the problem:

Thank you

abstract class Parent<A>{
    private _value:A
    constructor (value:A){
        this._value=value
    }

    protected getValue():A {
        return this._value
    }

}

class ChildString extends Parent<string>{
    constructor(value:string){
        super(value)
    }

    public stringValue():ReturnType<typeof this.getValue> { //<---- error is here
        return this.getValue()
    }

}

The error message I am receiving is similar to:

Return type of public method from exported class has or is using private 'this'

Answer №1

Avoid the use of this by directly utilizing a class method

ReturnType<ChildString['getValue']>

Link to Playground

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