React Utilities for Extism

This repository contains hooks as well as a React component to make it easy for React developers to integrate Extism into their applications. The implementation of these utilities is based off of the Universal JavaScript SDK. In some cases, you may be better off using that.

Hooks

usePlugin

The usePlugin hook is the primary export of this library. It allows developers to easily initialize and execute Extism plugins.

import { usePlugin } from '@extism/react'

// ...

function MyFunctionalComponent() {
  const { plugin, loading: pluginLoading, useFunction } = usePlugin(pluginSource, { useWasi: true })
  const input = 'some input'
  useEffect(() => {
    plugin?.call('count_vowels', input).then((output) => {
      // do stuff with output
    })
  }, [plugin, input])
  return (
    // ...
  )
}

Check out the source

Check out the examples for exact usage

useFunction

The useFunction hook is returned from usePlugin and serves as a convenience hook to allow developers to more tersely invoke Extism functions.

import { usePlugin } from '@extism/react'

// ...

function MyFunctionalComponent() {
  const { plugin, loading: pluginLoading, useFunction } = usePlugin(pluginSource, { useWasi: true })
  const input = 'some input'
  const { output, loading } = useFunction('count_vowels', hookInput);
  // do stuff with output
  return (
    // ...
  )
}

Check out the source

Check out the examples for exact usage

Component

ExtismPlugin

The ExtismPlugin component is currently the only React component exposed by this library. It allows developers to initialize Extism plugins using JSX and specify which plugin function should be called. When rendered without any children, the output of the plugin function is decoded as text and rendered as HTML. When rendered with children, the output of the plugin function is passed as an argument to the children to allow the developer more flexibility.

import { ExtismPlugin } from '@extism/react'

function MyComponent() {
  return (
    <div>
      <ExtismPlugin source='https://location_of_extism_plugin.wasm' input={someInput} functionName='some_function_name' />
    </div>
  )
}

Check out the source

Check out the examples for exact usage

Examples

An example application was created using npx create-react-app example and can be found in the root of this repository. The App.js component contains an example usage of the usePlugin hook, and the ExtismPlugin component. Check out the comments in the code for how to use the useFunction hook, and rendering ExtismPlugin with children. You may start the application by running npm start in the example directory (after running npm i)

Questions?

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