What types does the function expect and return?

Question

RepoPilot · Accepted Answer

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

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

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

The function accepts a single parameter of type `string` and returns a `string`. This is also validated at runtime in [index.js:L2-L4], where the function throws a `TypeError` if the input is not a string:

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

The test file confirms this behavior in [index.test-d.ts:L4], which uses `expectType<string>()` to verify the return type.

FOLLOW_UPS:
- What special characters does the function escape?
- How does the function handle the hyphen character differently?
- Can you show me an example of the function's output?