# Source: https://github.com/quick-lint/quick-lint-js/blob/master/docs/errors/E0179.md

# E0179: return statement returns nothing (undefined)

A `return` statement can have an optional expression. If the expression is
omitted, `undefined` is returned.

If a `return` statement has an expression, the expression must start on the same
line as the `return` keyword. If an expression starts on the next line, the
`return` statement behaves as if no expression was given, so the returned
value is `undefined` and the next line is skipped:

```javascript
function getWebsiteBaseURL() {
  return
    'https://quick-lint-js.com/';
}
// TypeError: URL constructor: undefined is not a valid URL.
console.log(getWebsiteBaseURL().hostname);
```

To fix this error, put the returned value on the same line as the `return`
keyword:

```javascript
function getWebsiteBaseURL() {
  return 'https://quick-lint-js.com/';
}
// "quick-lint-js.com"
console.log(getWebsiteBaseURL().hostname);
```

Introduced in quick-lint-js version 0.7.0.