Find all refs/rename for mapped type symbols via Record

[OliverJAsh]

TypeScript Version: 2.6.1.

Code

Renaming a should rename both instances of a T.a and O.a, but it doesn't.

{
  type T = { a: number, b: string };
  type O = Record<keyof T, {}>;
  var t: T = { a: 1, b: "s" };
  var o: O = { a: 3 };
}

If we replace Record with its underlying implementation, renaming does work:

{
  type T = { a: number, b: string };
  type O = { [key in keyof T]: {} };
  var t: T = { a: 1, b: "s" };
  var o: O = { a: 3 };
}

Related #12450

[mhegazy]

Duplicate of #11997

[OliverJAsh]

After reading that issue, I don't understand why this works when using mapped types and keyof directly, but not via the Record type alias which does exactly the same thing under the hood. 🤔

[OliverJAsh]

To re-iterate:

// Renaming does work across mapped types
{
  type T = { a: number, b: string };
  type O = { [key in keyof T]: {} };
  var t: T = { a: 1, b: "s" };
  var o: O = { a: 3, b: 4 };
}
// Renaming does not work across mapped types
{
  type T = { a: number, b: string };
  type O = Record<keyof T, {}>;
  var t: T = { a: 1, b: "s" };
  var o: O = { a: 3, b: 4 };
}
// Renaming does not work across mapped types
{
  type T = { a: number, b: string };
  type MyRecord<T extends string, V> = { [key in T]: V }
  type O = MyRecord<keyof T, {}>;
  var t: T = { a: 1, b: "s" };
  var o: O = { a: 3, b: 4 };
}

[OliverJAsh]

@mhegazy Hey! Do you have any ideas why this issue appears to only occur when using Record, but not when using mapped types and keyof directly? See my example in the comment above.

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.