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 vote165 views1 answer
Reduce an array of objects to string
TypeScript
0 vote183 views1 answer
Type 'FormGroup' is missing the following properties from type 'NgForm': submitted, _directives, form, ngSubmit, and 18 more
TypeScript
0 vote161 views2 answers
Brackets latex
TypeScript
9 votes171 views5 answers
Array of objects typescript
TypeScript
1 vote164 views1 answer
Git writing objects slow
TypeScript
0 vote164 views1 answer
Scripted testing and exploratory testing
TypeScript
10 votes173 views4 answers
Python add elements of two lists together
TypeScript
0 vote165 views1 answer
Excel separate input cell contents by space
TypeScript
-1 vote168 views1 answer
Components of http request
TypeScript
1 vote165 views1 answer
Ract import image
TypeScript