What types does the function expect and return?

Question

RepoPilot · Accepted Answer

The `escapeStringRegexp` function expects a **string** as input and returns a **string**.

This is defined in the TypeScript declaration file [index.d.ts:L16-L17]:

```typescript
export default function escapeStringRegexp(string: string): string;
```

The implementation in [index.js:L1-L4] enforces this by throwing a `TypeError` if the input is not a string:

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

FOLLOW_UPS:
- What RegExp special characters does it escape?
- How does the function handle Unicode characters?
- What happens if you pass non-string input?