How to write generic type for literal name in typescript?-CodePudding

I am writing d.ts file for js-data library, and the following code can simplify my demands:

interface Note {
  id: number,
  title: string,
  text: string
}
interface Comment {
  id: number,
  content: string,
  noteId: number
}

function create(name: 'note', attrs: Note): Note
function create(name: 'comment', attrs: Comment): Comment
// ... and so on

Based on above definitions, I can invoke functions for type checks:

create('note', { id: 1, title: 'note title', body: 'note body' }) // work
create('comment', { id: 11, content: 'comment content', noteId: 1 }) // work

create('nott', ...) // not work, there is a spelling mistake
create('note', { id: 11, content: 'comment content', noteId: 1 }) // not work, attrs should be type Note

Though I can write as many as possible overloading functions like above, but the work is too tedious. Is there any way to simplify such work with generics?

CodePudding user response：

type Attrs = {
  note: Note
  comment: Comment
}

type AttrName = keyof Attrs

declare function create<T extends AttrName>(name: T, attrs: Attrs[T]): Note

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