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 vote150 views1 answer
RuntimeError: Java gateway process exited before sending its port number site:stackoverflow.com
TypeScript
0 vote160 views1 answer
TypeError: key must be an instance of a class implements jwt.AbstractJWKBase
TypeScript
1 vote156 views1 answer
Headphone disconnects in ubuntu
TypeScript
0 vote161 views1 answer
Typescript vue html css types
TypeScript
0 vote156 views1 answer
How to check if all elements are equal C#
TypeScript
0 vote164 views1 answer
Keyboard shortcuts to delete whole word using backspace
TypeScript
2 votes141 views1 answer
Ts sorting
TypeScript
0 vote148 views1 answer
Typescrpt add onject to window namespace
TypeScript
0 vote150 views1 answer
Flutter localize time
TypeScript
8 votes175 views3 answers
Your account has reached its concurrent builds limit
TypeScript