Created
July 30, 2024 12:24
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Change type of object property while preserving JSDoc
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| type Replace< | |
| Obj extends Record<string, any>, | |
| Field extends keyof Obj, | |
| NewType, | |
| > = Reveal< | |
| { [Key in keyof Obj]: Key extends Field ? NewType : Obj[Key] } | |
| > | |
| type Reveal<Obj extends Record<string, any>> = { | |
| [K in keyof Obj]: Obj[K] | |
| } | |
| // ========================= | |
| type X = { | |
| /** This is a foo. */ | |
| foo: string | |
| } | |
| type Y = Replace<X, 'foo', number> | |
| declare const y: Y | |
| void y.foo // same JSDoc! |
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