/TypeScript/Typescript one of the array items

Typescript one of the array items

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 vote253 views1 answer
2d array of strings and ints python
TypeScript
2 votes256 views2 answers
Material dialog disable close
TypeScript
1 vote254 views1 answer
Typescript assigning parameter is forbidden
TypeScript
0 vote280 views1 answer
Drop table if exists redshift
TypeScript
0 vote291 views1 answer
Java read all objects on a file
TypeScript
1 vote242 views1 answer
Npm type-check nested arrays
TypeScript
0 vote266 views1 answer
React full calendar
TypeScript
0 vote339 views1 answer
Lodash typescript
TypeScript
9 votes281 views3 answers
Ng.ps1 cannot be loaded because running scripts is disabled on this system vscode
TypeScript
0 vote238 views1 answer
Import validator adonisjs 5
TypeScript