Is there a method for creating TypeScript definitions that generates members dynamically?

While I'm not completely satisfied with the title of this question, I struggled to come up with something better at the moment.

I have a feeling that what I am looking for may not be supported, but I am willing to be proven wrong!

Currently, I am working with an API where the member names in the object returned can vary based on the query.

For example:

GetInfo(languages?:string[]);
GetInfo() => { name: "Cologne" };
GetInfo(["en", "de"]) => { name: "Cologne", name_en: "Cologne", name_de: "Köln" };

My question is, is there a method to create a definition that will automatically generate the name_{language} members?

typescript

Answer №1

Manipulating property names by concatenating strings to create type-checked properties is not supported in this way.

The workaround is to return an object with properties that have the same names as the language names:

function GetInfo<T extends string>(langs: T[]): Record<T | 'default', string>{
  return null as any;
}
let values = GetInfo(["en", "de"]) // values is  { en: string; de: string; default: string  }
values.default
values.de
values.en

A GitHub issue suggests adding support for string literal manipulations, but it's currently not on the roadmap.

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