# @wavesurfer/react

[![npm](https://img.shields.io/npm/v/@wavesurfer/react)](https://www.npmjs.com/package/@wavesurfer/react)

A React component and hook for [wavesurfer.js](http://github.com/katspaugh/wavesurfer.js).

It makes it easy to use wavesurfer from React. All of the familiar [wavesurfer options](https://wavesurfer.xyz/docs/types/wavesurfer.WaveSurferOptions) become React props.

You can subscribe to various [wavesurfer events](https://wavesurfer.xyz/docs/types/wavesurfer.WaveSurferEvents) also via props. Just prepend an event name with on, e.g. `ready` -> `onReady`. Each event callback receives a wavesurfer instance as the first argument.

## Installation

With yarn:
```bash
yarn add wavesurfer.js @wavesurfer/react
```

With npm:
```bash
npm install wavesurfer.js @wavesurfer/react
```

## Usage

As a component:

```js
import WavesurferPlayer from '@wavesurfer/react'

const App = () => {
  const [wavesurfer, setWavesurfer] = useState(null)
  const [isPlaying, setIsPlaying] = useState(false)

  const onReady = (ws) => {
    setWavesurfer(ws)
    setIsPlaying(false)
  }

  const onPlayPause = () => {
    wavesurfer && wavesurfer.playPause()
  }

  return (
    <>
      <WavesurferPlayer
        height={100}
        waveColor="violet"
        url="/my-server/audio.wav"
        onReady={onReady}
        onPlay={() => setIsPlaying(true)}
        onPause={() => setIsPlaying(false)}
      />

      <button onClick={onPlayPause}>
        {isPlaying ? 'Pause' : 'Play'}
      </button>
    </>
  )
}
```

Alternatively, as a hook:

```js
import { useRef } from 'react'
import { useWavesurfer } from '@wavesurfer/react'

const App = () => {
  const containerRef = useRef(null)

  const { wavesurfer, isReady, isPlaying, currentTime } = useWavesurfer({
    container: containerRef,
    url: '/my-server/audio.ogg',
    waveColor: 'purple',
    height: 100,
  })

  const onPlayPause = () => {
    wavesurfer && wavesurfer.playPause()
  }

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

      <button onClick={onPlayPause}>
        {isPlaying ? 'Pause' : 'Play'}
      </button>
    </>
  )
}
```

## Using plugins

Wavesurfer [plugins](https://wavesurfer.xyz/docs/modules/plugins_index) can be passed in the `plugins` option.

**Important:** The `plugins` array **must be memoized** using `useMemo` or defined outside the component. This is because wavesurfer.js mutates plugin instances during initialization, and passing a new array on every render will cause errors.

### Basic example with a single plugin

```js
import { useMemo } from 'react'
import WavesurferPlayer from '@wavesurfer/react'
import Timeline from 'wavesurfer.js/dist/plugins/timeline.esm.js'

const App = () => {
  const plugins = useMemo(() => {
    return [
      Timeline.create({
        container: '#timeline',
      }),
    ]
  }, [])

  return (
    <>
      <WavesurferPlayer
        height={100}
        waveColor="violet"
        url="/audio.wav"
        plugins={plugins}
      />
      <div id="timeline" />
    </>
  )
}
```

### Example with multiple plugins

```js
import { useMemo } from 'react'
import WavesurferPlayer from '@wavesurfer/react'
import Timeline from 'wavesurfer.js/dist/plugins/timeline.esm.js'
import Regions from 'wavesurfer.js/dist/plugins/regions.esm.js'

const App = () => {
  const plugins = useMemo(() => {
    return [
      Timeline.create({
        container: '#timeline',
      }),
      Regions.create(),
    ]
  }, [])

  return (
    <>
      <WavesurferPlayer
        height={100}
        waveColor="violet"
        url="/audio.wav"
        plugins={plugins}
      />
      <div id="timeline" />
    </>
  )
}
```

### Alternative: Define plugins outside the component

If your plugins don't depend on component props or state, you can define them outside:

```js
import WavesurferPlayer from '@wavesurfer/react'
import Timeline from 'wavesurfer.js/dist/plugins/timeline.esm.js'

// Define plugins outside the component
const plugins = [
  Timeline.create({
    container: '#timeline',
  }),
]

const App = () => {
  return (
    <>
      <WavesurferPlayer
        height={100}
        waveColor="violet"
        url="/audio.wav"
        plugins={plugins}
      />
      <div id="timeline" />
    </>
  )
}
```

## Docs

https://wavesurfer.xyz