# Presets
## Shared
By default, certain Next.js internals are automatically shared to optimize your application.
It's important to note that manually sharing these internals can lead to errors, as they are already handled for you.
- `next/dynamic`
- `next/head`
- `next/link`
- `next/router`
- `next/script`
- `react`
- `react/`
- `react-dom`
- `react-dom/`
- `styled-jsx`
- `styled-jsx/style`
Click to Expand
`DEFAULT_SHARE_SCOPE`
:
```ts
export const DEFAULT_SHARE_SCOPE: SharedObject = {
'next/dynamic': {
requiredVersion: undefined,
singleton: true,
import: undefined,
},
'next/head': {
requiredVersion: undefined,
singleton: true,
import: undefined,
},
'next/link': {
requiredVersion: undefined,
singleton: true,
import: undefined,
},
'next/router': {
requiredVersion: false,
singleton: true,
import: undefined,
},
'next/image': {
requiredVersion: undefined,
singleton: true,
import: undefined,
},
'next/script': {
requiredVersion: undefined,
singleton: true,
import: undefined,
},
react: {
singleton: true,
requiredVersion: false,
import: false,
},
'react/': {
singleton: true,
requiredVersion: false,
import: false,
},
'react-dom/': {
singleton: true,
requiredVersion: false,
import: false,
},
'react-dom': {
singleton: true,
requiredVersion: false,
import: false,
},
'react/jsx-dev-runtime': {
singleton: true,
requiredVersion: false,
},
'react/jsx-runtime': {
singleton: true,
requiredVersion: false,
},
'styled-jsx': {
singleton: true,
import: undefined,
version: require('styled-jsx/package.json').version,
requiredVersion: '^' + require('styled-jsx/package.json').version,
},
'styled-jsx/style': {
singleton: true,
import: false,
version: require('styled-jsx/package.json').version,
requiredVersion: '^' + require('styled-jsx/package.json').version,
},
'styled-jsx/css': {
singleton: true,
import: undefined,
version: require('styled-jsx/package.json').version,
requiredVersion: '^' + require('styled-jsx/package.json').version,
},
};
```
