Last active
December 1, 2020 13:26
-
-
Save WORMSS/bae2b44730ac41d76d48a9ad4dc89329 to your computer and use it in GitHub Desktop.
Typescript: My advanced types I don't want to lose
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| type Optional<T, K extends keyof T = keyof T> = Omit<T, K> & Partial<Pick<T, K>>; | |
| type AllOrNothing<T> = T | Partial<Record<keyof T, never>>; | |
| type OnlyOne<T> = { | |
| [K in keyof T]: ( | |
| Required<Pick<T, K>> & Partial<Record<Exclude<keyof T, K>, never>> | |
| ) | |
| }[keyof T]; | |
| type Test = { | |
| a: string; | |
| b?: string; | |
| } & AllOrNothing<{ | |
| c: boolean; | |
| d: (h: boolean) => void; | |
| }> & Partial<OnlyOne<{ | |
| e: boolean; | |
| f: boolean; | |
| g: boolean; | |
| }>>; | |
| const t1: Test = { // Should pass, c and d supplied together, only choosen e. | |
| a: 'a', | |
| b: 'b', | |
| c: false, | |
| d: (h: boolean) => {}, | |
| e: true, | |
| } | |
| const t2: Test = { // Should pass even though e, f, g are not supplied due to Parital Wrapper | |
| a: 'a', | |
| }; | |
| const t3: Test = { // Should pass as only f is supplied | |
| a: 'a', | |
| f: false, | |
| }; | |
| const t4: Test = { // Should error because f and g should not exist together | |
| a: 'a', | |
| f: false, | |
| g: false, | |
| }; | |
| const t5: Test = { // Should pass because c and d are passed together | |
| a: 'a', | |
| c: false, | |
| d: (h: boolean) => null, | |
| g: false, | |
| } | |
| const t6: Test = { // Should error because c and d should exist together | |
| a: 'a', | |
| c: true, | |
| } | |
| const t7: Test = { // Should error because c and d should exist together | |
| a: 'a', | |
| d: (h: boolean) => null, | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment