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 checks if the input is a string:

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

If you pass anything other than a string (like a number, object, null, etc.), it will throw a `TypeError` with the message "Expected a string". This validation happens before any escaping logic is executed.

The TypeScript definitions in [index.d.ts:L16] enforce this at compile time as well by requiring the parameter to be typed as `string`.

FOLLOW_UPS:
- What characters does the function escape exactly?
- Can this function handle Unicode characters safely?
- Why does the function escape hyphens differently than other characters?