🔎 Search Terms

Type alias circularly references itself (5.4 regression)

🕗 Version & Regression Information

• This changed between versions 5.3.3 and 5.4.5

⏯ Playground Link

https://www.typescriptlang.org/play?ts=5.4.5#code/C4TwDgpgBAQg9nANhAhgOwAouACwM4A8AKgHxQC8UewATgJZoDmUAZALABQUUA3p99wDaAaSgMoAawgg4AMyhEAugC4FIxVAgAPYBDQATPFABGCZOn4DuAfijDLV1UXWadew1DjGAVhADGwA4CtqLaugZGaACuALbGEDRQAD5UtAyMQVa2AAYAJDzCAL4AdPnwSKiY2PjE6iSF2ZkCqmgQAG4JTS3tCQDcloWCUjLySv0c-EA

💻 Code

type BooleanPaths<T> = string &
  {
    [K in keyof T]: T[K] extends boolean
      ? K
      : T[K] extends object
      ? K extends number | string
        ? `${K}.${BooleanPaths<T[K]>}`
        : never
      : never;
  }[keyof T];

🙁 Actual behavior

This code fails with two errors:

Type alias 'BooleanPaths' circularly references itself.
Type 'BooleanPaths' is not generic.

🙂 Expected behavior

The compilation should pass, as it has in previous versions.

Additional information about the issue

No response