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

1 vote285 views1 answer
Ts queryselectorall as htmlelement
TypeScript
3 votes367 views1 answer
Typescript == vs ===
TypeScript
0 vote285 views1 answer
Style type in typescript in react
TypeScript
0 vote288 views1 answer
How to check git folder exists or not
TypeScript
18 votes306 views2 answers
Fluttter http get
TypeScript
0 vote282 views1 answer
Lodash mapvalues
TypeScript
0 vote302 views1 answer
Install dependencies angular
TypeScript
22 votes338 views4 answers
Cmd listening ports
TypeScript
0 vote283 views1 answer
Best esports game ever
TypeScript
2 votes297 views1 answer
Google reference static
TypeScript