553 - Deep object to unique

[myNameIsDu]

type Merge<T> = {
  [P in keyof T]: T[P]
}
type DeepObjectToUniq<O extends object> = {
  [P in keyof O]: O[P] extends object
    ? DeepObjectToUniq<Merge<O[P] & { _xxx?: [O, P] }>>
    : O[P]
}

[yangliguo7]

HI~ What does _xxx mean ？Why does this make the test run ?

[myNameIsDu]

HI~ What does _xxx mean ？Why does this make the test run ?

It's just an optional property