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05821-medium-maptypes.ts
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05821-medium-maptypes.ts
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// ============= Test Cases =============
import type { Equal, Expect } from './test-utils'
type cases = [
Expect<Equal<MapTypes<{ stringToArray: string }, { mapFrom: string; mapTo: [] }>, { stringToArray: [] }>>,
Expect<Equal<MapTypes<{ stringToNumber: string }, { mapFrom: string; mapTo: number }>, { stringToNumber: number }>>,
Expect<
Equal<
MapTypes<{ stringToNumber: string; skipParsingMe: boolean }, { mapFrom: string; mapTo: number }>,
{ stringToNumber: number; skipParsingMe: boolean }
>
>,
Expect<
Equal<
MapTypes<{ date: string }, { mapFrom: string; mapTo: Date } | { mapFrom: string; mapTo: null }>,
{ date: null | Date }
>
>,
Expect<Equal<MapTypes<{ date: string }, { mapFrom: string; mapTo: Date | null }>, { date: null | Date }>>,
Expect<
Equal<
MapTypes<{ fields: Record<string, boolean> }, { mapFrom: Record<string, boolean>; mapTo: string[] }>,
{ fields: string[] }
>
>,
Expect<Equal<MapTypes<{ name: string }, { mapFrom: boolean; mapTo: never }>, { name: string }>>,
Expect<
Equal<
MapTypes<{ name: string; date: Date }, { mapFrom: string; mapTo: boolean } | { mapFrom: Date; mapTo: string }>,
{ name: boolean; date: string }
>
>
]
// ============= Your Code Here =============
interface MapObject {
mapFrom: unknown
mapTo: unknown
}
type MapTypes<T, R extends MapObject> = {
[k in keyof T]: T[k] extends R['mapFrom'] ? (R extends { mapFrom: T[k] } ? R['mapTo'] : never) : T[k]
}