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

0 vote148 views1 answer
Outputs i angular
TypeScript
0 vote162 views1 answer
Flutter network image show loading indicator
TypeScript
26 votes120 views2 answers
List commits in git
TypeScript
0 vote125 views1 answer
Geodataframe from lat lon points python
TypeScript
2 votes162 views1 answer
Allegro gdzie jest moja paczka
TypeScript
0 vote123 views1 answer
Adding two lists using lambda function
TypeScript
0 vote121 views1 answer
Oracle objects in tablespace
TypeScript
0 vote121 views1 answer
Typescript compare strings
TypeScript
0 vote157 views1 answer
Write a C proogram to find the roots of quadratic equation
TypeScript
10 votes90 views1 answer
Online javascript to typescript compiler
TypeScript