KeysOfType

[eklenin]

  type KeysOfType<T, U> = {
    [K in keyof T]: T[K] extends U ? K : never;
  }[keyof T];

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[sindresorhus]

The issue needs a description of the type and what problems it solves.

[mwaibel-go]

This is the userland implementation of https://github.com/microsoft/TypeScript/issues/48992 mentioned in the issue description. While it’s not implemented in TypeScript, I’d appreciate it being here.

[sindresorhus]

Accepted