# React

- Human documentation: [https://docs.univer.ai/guides/docs/getting-started/integrations/react](https://docs.univer.ai/guides/docs/getting-started/integrations/react)

- Agent Markdown: [https://docs.univer.ai/guides/docs/getting-started/integrations/react.md](https://docs.univer.ai/guides/docs/getting-started/integrations/react.md)

- Requested language: `en-US`

- Content language: `en-US`

- Documentation version: `1.0.0-rc.0`

- Source: [docs/getting-started/integrations/react.mdx](https://github.com/dream-num/documentation/blob/dev/content/guides/docs/getting-started/integrations/react.mdx)

---

> [!NOTE]
> If you are looking for how to use React components as custom components, please refer to [here](https://docs.univer.ai/guides/docs/ui/components.md#react).

Before integrating Univer into a React project, please ensure you have read the [Univer installation and basic usage](https://docs.univer.ai/guides/docs/getting-started/installation.md) section and understand the basic concepts and lifecycle hooks of React.

## Integrating Web SDK with React 18 & 19

### Integration Steps

1. Initialize Univer in the `useEffect` hook
2. Destroy Univer in the return function of the `useEffect` hook

### Example

```tsx
import { UniverDocsCorePreset } from '@univerjs/preset-docs-core'
import UniverPresetDocsCoreEnUS from '@univerjs/preset-docs-core/locales/en-US'
import { createUniver, LocaleType, mergeLocales } from '@univerjs/presets'
import { useEffect, useRef } from 'react'

import '@univerjs/preset-docs-core/lib/index.css'

export function App() {
  const containerRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    const { univerAPI } = createUniver({
      locale: LocaleType.EN_US,
      locales: {
        [LocaleType.EN_US]: mergeLocales(
          UniverPresetDocsCoreEnUS,
        ),
      },
      presets: [
        UniverDocsCorePreset({
          container: containerRef.current,
        }),
      ],
    })

    univerAPI.createDocument({})

    return () => {
      univerAPI.dispose()
    }
  }, [])

  return (
    <div ref={containerRef} />
  )
}
```

## Integrating Web SDK with React 16.9+ & 17

### Notes before integration

#### Compatibility Notes

Univer's view layer is developed based on React 18.3.1, but we provide minimal compatibility support for React 16.9+ & 17 projects. Please note that this does not mean low versions of React will be supported indefinitely; we recommend upgrading to the latest version as soon as possible for the best experience and new features.

#### Build Tool Alias Configuration

In a React 16.9+ & 17 environment, you need to use the alias feature of your build tool to simulate the export of `react-dom/client`, otherwise some features may not work properly.

**Vite Configuration Example**

```typescript title="vite.config.ts"
export default defineConfig({
  plugins: [react()],
  resolve: {
    alias: {
      'react-dom/client': path.resolve(__dirname, './src/client.ts'), // [!code ++]
    },
  },
})
```

```typescript title="src/client.ts"
import ReactDOM from 'react-dom'

export function createRoot(container: HTMLElement) {
  return {
    render: (element: JSX.Element) => {
      ReactDOM.render(element, container)
    },
  }
}
```

#### CDN/UMD Scene Adaptation

If you are including Univer and React via `<script>` tags, you also need to ensure that the following code is added after importing React to simulate the export of `react-dom/client`:

```html
<script>
  /**
   * With the support for React 19[^1], UMD users may need additional adaptation.
   *
   * [^1]: [support for React 19] https://github.com/dream-num/univer/pull/4247
   */

  /**
   * Fix `Uncaught TypeError: client.createRoot is not a function`
   * If using UMD React < 18, you might need the following code.
   */
  ;(function (global) {
    'use strict'
    if (!global.ReactDOM) {
      throw new Error('ReactDOM must be loaded before ReactCreateRoot.')
    }
    const ReactDOM = global.ReactDOM
    if (!ReactDOM.createRoot) {
      ReactDOM.createRoot = function (container) {
        return {
          render: (element) => {
            ReactDOM.render(element, container)
          },
        }
      }
    }
  })(this)

  /**
   * Fix `Uncaught TypeError: jsxRuntime.jsx is not a function`
   * If using UMD React, you might need the following code.
   * Reference: https://unpkg.com/react@18.3.1/cjs/react-jsx-runtime.production.min.js
   */
  ;(function (global) {
    'use strict'
    if (!global.React) {
      throw new Error('React must be loaded before ReactJSXRuntime.')
    }
    const React = global.React
    if (!React.jsx || !React.jsxs) {
      const REACT_ELEMENT_TYPE = Symbol.for('react.element')
      const hasOwnProperty = Object.prototype.hasOwnProperty
      const RESERVED_PROPS = {
        key: true,
        ref: true,
        __self: true,
        __source: true,
      }
      const ReactCurrentOwner = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentOwner
      function createReactElement(type, config, maybeKey) {
        const props = {}
        let key = null
        let ref = null
        if (maybeKey !== undefined) {
          key = `${maybeKey}`
        }
        if (config.key !== undefined) {
          key = `${config.key}`
        }
        if (config.ref !== undefined) {
          ref = config.ref
        }
        for (var propName in config) {
          if (hasOwnProperty.call(config, propName) && !RESERVED_PROPS.hasOwnProperty(propName)) {
            props[propName] = config[propName]
          }
        }
        if (type && type.defaultProps) {
          const defaultProps = type.defaultProps
          for (var propName in defaultProps) {
            if (props[propName] === undefined) {
              props[propName] = defaultProps[propName]
            }
          }
        }
        return {
          $$typeof: REACT_ELEMENT_TYPE,
          type,
          key,
          ref,
          props,
          _owner: ReactCurrentOwner.current,
        }
      }
      React.jsx = createReactElement
      React.jsxs = createReactElement
    }
  })(this)
</script>
```

### Integration Steps

1. Initialize Univer in the `useEffect` hook
2. Destroy Univer in the return function of the `useEffect` hook

### Example

```tsx
import { UniverDocsCorePreset } from '@univerjs/preset-docs-core'

import UniverPresetDocsCoreEnUS from '@univerjs/preset-docs-core/locales/en-US'
import { createUniver, LocaleType, mergeLocales } from '@univerjs/presets'
import { useEffect, useRef } from 'react'

import '@univerjs/preset-docs-core/lib/index.css'

export function App() {
  const containerRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    const { univerAPI } = createUniver({
      locale: LocaleType.EN_US,
      locales: {
        [LocaleType.EN_US]: mergeLocales(
          UniverPresetDocsCoreEnUS,
        ),
      },
      presets: [
        UniverDocsCorePreset({
          container: containerRef.current,
        }),
      ],
    })

    univerAPI.createDocument({})

    return () => {
      univerAPI.dispose()
    }
  }, [])

  return (
    <div ref={containerRef} />
  )
}
```