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 vote198 views1 answer
How to Convert MATLAB Scripts to Python
TypeScript
0 vote234 views1 answer
Fruits = ["apple", "banana", "cherry"] for x in fruits: print(x) if x == "banana": break Identify output ?
TypeScript
0 vote212 views1 answer
Different types of errors in numerical methods
TypeScript
1 vote200 views2 answers
Typescript run on save
TypeScript
0 vote243 views1 answer
React native vector icon ts file configuaration
TypeScript
-1 vote222 views1 answer
Whats a company letterhead
TypeScript
1 vote286 views1 answer
Powershell script remove directory recursive
TypeScript
0 vote208 views1 answer
Testing tools vs testing techniques
TypeScript
1 vote203 views1 answer
Typescript var global: typeof globalThis
TypeScript
1 vote187 views1 answer
Add correct host key in known_hosts to get rid of this message
TypeScript