/TypeScript/Typescript one of the array items

Typescript one of the array items

Typescript one of array

function stringLiterals<T extends string>(...args: T[]): T[] { return args; }
type ElementType<T extends ReadonlyArray<unknown>> = T extends ReadonlyArray<infer ElementType> ? ElementType : never;

const values = stringLiterals('A', 'B');
type Foo = ElementType<typeof values>;

const v1: Foo = 'A' // This should work
const v2: Foo = 'D' // This should give me an error since 'D' doesn't exist in values

Source: github.com

Typescript one of the array items

const animals = ['cat', 'dog', 'mouse'] as const
type Animal = typeof animals[number]

// type Animal = 'cat' | 'dog' | 'mouse'

Source: steveholgado.com

Similar codes

2 votes199 views1 answer
Angular convert file to base64
TypeScript
0 vote201 views3 answers
Get weights of a layer keras
TypeScript
4 votes165 views1 answer
Typescript define return type based on parameter
TypeScript
4 votes187 views2 answers
Angular get route url
TypeScript
-1 vote192 views1 answer
Body massage centers in kochi
TypeScript
42 votes194 views10 answers
Youtube
TypeScript
0 vote198 views1 answer
Google chrome keyboard shortcuts windows
TypeScript
0 vote207 views1 answer
(Html.DevExtreme().FileUploader() dialogtrigger example
TypeScript
8 votes209 views3 answers
L'exécution de scripts est désactivée sur ce système.
TypeScript
0 vote219 views2 answers
Register service worker
TypeScript