Generic Type Inheritance in TypeScript

Question

I am pretty new to Typescript. Please help me in explaining what is wrong with the below code snippet.

interface ICalcValue {

    readonly IsNumber : boolean;

    readonly : IsString : boolean;

}



interface ICalcValue<T> extends ICalcValue {

    readonly T Value;

}

At least could you give some details about the error you get when you try to compile it. — C.Champagne
– C.Champagne, Commented Sep 2, 2019 at 8:16

Titian Cernicova-Dragomir · Accepted Answer · 2019-09-02 08:17:42Z

1

Unlike other languages (ex C#). Having two types that differ only by type parameters is not possible in typescript. You will need to use different names for the interfaces (fixing the other minor syntax errors):

interface ICalcValueBase {

    readonly IsNumber: boolean;

    readonly IsString: boolean;

}

interface ICalcValue<T> extends ICalcValueBase {

    readonly Value: T;

}

play

answered Sep 2, 2019 at 8:17

Titian Cernicova-Dragomir

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