Search Terms

pick, nested, deep

Suggestion

Pick can only be used to access properties at the top level of an object, it should support paths to get at more deeply nested values.

Use Cases

Typing form inputs from GraphQL fragments

Examples

type Company = {
  id: number;
  name: string;
  address: {
    id: number;
    street: string;
    city: string;
    state: string;
  };
}

You could then construct a new type as follows:
type FlatCompany = Pick<Company, "id" | "name" | { "addressId": ["address", "id"] }>

Which would yield:

type FlatCompany = {
  id: number;
  name: string;
  addressId: number;
}

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.