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

* **Type**: `boolean`
* **Optional**

Whether to keep external dynamic imports as `import(...)` expressions in CommonJS output.

If set to `false`, external dynamic imports will be rewritten to use `require(...)` calls.
An `import()` with a second argument, such as `{ with: { type: 'json' } }`, stays an
`import()`, because `require()` cannot carry import attributes.
This may be necessary to support environments that do not support dynamic `import()` in CommonJS modules like old Node.js versions.

## Default

```ts
true
```