What types does the function expect and return?

Question

RepoPilot · Accepted Answer

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

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

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

The function also validates its input at runtime in [index.js:L2-L4]:

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

If you pass anything other than a string, it will throw a `TypeError`.

FOLLOW_UPS:
- What characters does the function escape?
- How does the function handle the hyphen character?
- Can the output be used directly in a RegExp constructor?