How does this function validate its input — does it throw on bad arguments?

Question

RepoPilot · Accepted Answer

Yes, the function validates its input and throws an error on bad arguments.

In [index.js:L2-L4], the function includes a type check:

```javascript
if (typeof string !== 'string') {
    throw new TypeError('Expected a string');
}
```

If you pass anything other than a string (e.g., a number, object, null, undefined), the function will throw a `TypeError` with the message `'Expected a string'`. This happens before any escaping logic is executed, ensuring that only valid string inputs proceed to the regex replacement operations [index.js:L8-L10].

FOLLOW_UPS:
- What characters does this function escape?
- Can you use the output in all regex contexts safely?
- What's the difference between the two replacement strategies?