How would TypeScript help in this task? How can you normalize the user ID to simplify checks?

TypeScript helps in such tasks through strict typing and the ability to describe data structures, which reduces errors when working with user IDs and simplifies validation.

To normalize user IDs and make validation easier, all IDs can be converted to a single format, for example:

• Convert to lowercase (if IDs are strings and case-sensitive)
• Remove extra spaces or special characters
• Convert numeric IDs to string type or vice versa

Example of a user ID normalization function in TypeScript:

function normalizeUserId(userId: string | number): string {
  return String(userId).trim().toLowerCase();
}

// Usage
const id1 = normalizeUserId(' User123 '); // 'user123'
const id2 = normalizeUserId(456); // '456'

This approach allows unifying IDs and writing validation checks without worrying about different input data formats.