---
url: /reference/OutputOptions.outro.md
---
# outro

* **Type**: `string` | ((`chunk`) => `string` | `Promise`<`string`>)
* **Optional**

A string to append inside any [format](./OutputOptions.format)-specific wrapper.

See [`output.footer`](./OutputOptions.footer), [`output.postFooter`](./OutputOptions.postFooter) as well.

This means `outro` code has access to the bundle's internal scope and can reference private variables and functions. For example, with `format: 'iife'`:

```js
// banner is placed here
var MyBundle = (function () {
  // intro is placed here
  var privateVar = 'internal'; // Only accessible inside IIFE

  // ... bundle code ...

  // outro is placed here - can access privateVar
  console.log(privateVar); // Works!
})();
// footer is placed here (global scope) - cannot access privateVar
```

## Examples

### Freeze exports

```js
export default {
  output: {
    format: 'iife',
    name: 'MyLib',
    outro: `
// Freeze the exported API to prevent modifications
if (typeof Object.freeze === 'function') {
  Object.freeze(exports);
}`,
  },
};
```