Ways to expand a TypeScript interface and make it complete

I'm striving to achieve the following:

interface Partials {
  readonly start?: number;
  readonly end?: number;
}

interface NotPartials extends Partials /* integrate Unpartialing in some way */ {
  readonly somewhere: number;
}

In this case, NotPartials would become:

readonly start: number;
readonly end: number;
readonly somewhere: number;

Observe how start and end are now mandatory. Is there a way to accomplish this?

Answer №1

Oh, how silly this seems.

It appears that in TypeScript version 2.8, a new possibility has arisen:

interface PartialSections {
  readonly beginning?: number;
  readonly conclusion?: number;
}

interface CompleteSections extends Required<PartialSections> {
  readonly elsewhere: number;
}

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