What types does the function expect and return?

Question

RepoPilot · Accepted Answer

According to the TypeScript definitions in [index.d.ts:L16-L17], the `escapeStringRegexp` function has this signature:

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

**Expected type:** The function expects a **string** parameter.

**Return type:** The function returns a **string**.

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

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

FOLLOW_UPS:
- What characters does the function escape?
- Can the function handle Unicode characters like emoji?
- What is the actual escape implementation?