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Description

type Item = {
  a: {
    b: 2;
    c: boolean;
  };
  d: {
    e: 3
  }
  f: 1;
}

type GetKeys<T> = {
  [K in keyof T]: [K, ...(T[K] extends object ? GetKeys<T[K]> : [])]
}[keyof T]

type To<T> = {
  index: GetKeys<T>; // Looking forward to ['a', 'b'] | ['a', 'c'] | ['d', 'e'] | ['f']
}

const obj: To<Item> = {
  index: ['d', 'e'], // Parameter 2 Prompt b | c | e | f Expected to prompt e
}

Contributor guide

Research direction

Inspect the type inference logic for recursive conditional types in tuples. Trace how the compiler resolves the second element after the first is known.

Tech stack

typescript

Domain

compilers

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-2 days

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

TypeScriptGit

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

40