# Source: https://github.com/quick-lint/quick-lint-js/blob/master/docs/errors/E0349.md

# E0349: function parameter cannot be parenthesized

Using parenthesis around the function parameter is invalid.

```typescript
let g = ((x)) => { };
let f = function ((x)) { };
```

To fix this error, remove the parenthesis.

```typescript
let g = (x) => { };
let f = function (x) { };
```