CODEWITHSUNDEEP
typescript
Riky Andreas
Riky Andreas

Reputation: 220

Same object name extend interface typescript

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

Upvotes: 0

Views: 346

Answers (1)

derpirscher
derpirscher

Reputation: 17400

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
  }
}

Upvotes: 2

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