Is it possible to include method in TypeScript interface?

Question

Just a simple question I was thinking about, is it possible to include method or function in an interface as following:

Waiting for your comments and ideas about possibilities or issues doing this:

export interface INewsletter {
  id: number;
  title: string;
  release_date: any;
  filename: string;
  original_filename: string;
  notification: boolean;
  file: File;
  newsletterTranslations: any;
  translations: any;
  newsletterFiles: any;
  newsletter_files: any;

  myMethod() { something to do } // My method here
}

@JuanMendes FYI, Java 8 allows you to provide default implementations for interface methods, like what they're asking here. — Retsam
– Retsam, Commented Nov 27, 2017 at 23:00

Igor · Accepted Answer · 2017-11-27 18:03:52Z

4

An interface is a contract. You can specify the interface has a method but you can't include an implementation. So adding myMethod() : void; is valid but not myMethod() { something to do } as this includes a implementation/body.

export interface INewsletter {
  id: number;
  title: string;
  release_date: any;
  filename: string;
  original_filename: string;
  notification: boolean;
  file: File;
  newsletterTranslations: any;
  translations: any;
  newsletterFiles: any;
  newsletter_files: any;


  myMethod():void; // replace void with any other return type or any
}

answered Nov 27, 2017 at 18:03

Igor

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