// Created on savesnippets.com · https://savesnippets.com/R2P1tgq1FnUzCR
type Brand<T, B> = T & { readonly __brand: B };

type UserId = Brand<string, 'UserId'>;
type PostId = Brand<string, 'PostId'>;

const asUserId = (s: string): UserId => s as UserId;
const asPostId = (s: string): PostId => s as PostId;

function deleteUser(id: UserId) { /* ... */ }

const u = asUserId('abc');
const p = asPostId('xyz');

deleteUser(u);   // ✓
deleteUser(p);   // ✗ Type 'PostId' is not assignable to 'UserId'
deleteUser('raw'); // ✗ raw strings rejected