Same object name extend interface typescript

Question

export interface example {
  book:{
    first:number;
    second:string;
  }
}

interface table extends example{
  book:{
    third:null
  }
}

Is it possible to extend same object in typescript ? in some case I only want to use example case without book third

Example without book third is example right. I did not understand what you want? — Tushar Shahi
– Tushar Shahi, Commented Aug 2, 2021 at 5:19

derpirscher · Accepted Answer · 2021-08-02 05:46:27Z

2

Why not just make third an optional property in the example interface?

export interface example {
  book:{
    first:number;
    second:string;
    third?: null;
  }
}

If you really need to extend example interface, you have to make the types compatible, ie the extended book needs at least all the properties, the base interface has ...

export interface example {
  book:{
    first:number;
    second:string;
  }
}

interface table extends example{
  book:{
    first: number;
    second: string;
    third:null
  }
}

answered Aug 2, 2021 at 5:46

derpirscher

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