What types does the function expect and return?

Question

RepoPilot · Accepted Answer

Based on the TypeScript definitions in [index.d.ts:L16-L17], the `escapeStringRegexp` function has the following type signature:

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

**Parameter:** Expects a `string`

**Return type:** Returns a `string`

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

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

The type test in [index.test-d.ts:L4] confirms this contract by verifying the return value is typed as `string`.

FOLLOW_UPS:
- What RegExp characters does the function escape?
- How does the function handle Unicode characters?
- What is the difference between backslash and hex escaping?