What types does the function expect and return?

Question

RepoPilot · Accepted Answer

The function expects a **string** parameter and returns a **string**.

According to the TypeScript type definition in [index.d.ts:L16-L17], the function signature is:

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

Additionally, the implementation in [index.js:L1-L4] enforces this contract by checking the input type at runtime:

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

If a non-string value is passed, a `TypeError` is thrown. The function always returns an escaped string when given valid input.

FOLLOW_UPS:
- What RegExp characters does the function escape?
- How does it handle the hyphen character specially?
- Can you show an example of the function in use?