keys

Problem

You need the typed keys of an object as a literal union rather than the string[] that Object.keys returns.

Solution

Use keys(obj) to get (keyof T)[] — the array of own enumerable keys with preserved literal types.

import { keys } from '@vielzeug/arsenal';

const config = { host: 'localhost', port: 3000 } as const;
keys(config); // ('host' | 'port')[]

Pitfalls

• Only returns own enumerable properties — same as Object.keys.

Related

• entries
• values