Integrate Your React App Into React Native App with WebView

react-native-react-bridge

An easy way to integrate your React (or Preact) app into React Native app with WebView.

Why?

If you'd like to run your React web app in React Native, rewriting it for React Native or using react-native-web is preferred way in most cases. But sometimes rewriting is overkill, when you are just prototyping, or when the app includes something not available on React Native, like rich text editor with contenteditable or complicated logic with WebAssembly.

So how we run React app in React Native app as it is? It's logically possible if you run your web code in WebView using react-native-webview. However bundling React code with React Native is troublesome and implementing communication between React Native and WebView is so hard.

This library gives a bridge to make it easy. This will bundle the whole React app by some additional codes and it will be automatically re-compiled if you edit it. You rarely need to think which code you are editing for React or React Native, like isomorphic. The communication between React app and React Native app will be also simplified by this.

Features

Create React (or Preact) app bundle for WebView automatically in build process of React Native
- .js, .ts, .jsx, .tsx, .mjs and .cjs will be packed into one source.
- NOTE: Only the edits in the entry file of web will invoke rebuild because of the limitation of metro's build process.
Handle communication between React Native and WebView with React hook style
- With useWebViewMessage hook, you can subscribe messages from WebView.
- With useNativeMessage hook, you can subscribe messages from React Native.
- emit function sends message.
Support bundling some assets in web side with ES6 import syntax
- .json is imported as an object, like require in Node.js.
- .txt and .md are imported as string, like raw-loader.
- .css is injected to the HTML head of WebView, like css-loader with style-loader.
- .bmp, .gif, .png, .jpg, .jpeg, .webp and .svg are loaded as base64 encoded url, like url-loader.
- .htm and .html are loaded as string, which can be rendered with React's dangerouslySetInnerHTML.
- .wasm is imported like Node.js, which is compatible with ES Module Integration Proposal for WebAssembly.

If you have some feature requests or improvements, please create a issue or PR.

Install

npm install react-native-react-bridge react-native-webview

# Necessary only if you render React app in WebView
npm install react-dom

# Necessary only if you render Preact app in WebView
npm install preact

Requirements

react >= 16.8
react-native >= 0.60
(preact >= 10.0)

Supported react-native versions

react-native-react-bridge	react-native
>=0.9.0	>=0.65.0
0.0.0 - 0.8.1	<=0.64.2

Usage

1. Fix `metro.config.js` to use babelTransformer from this library.

React Native

module.exports = {
  transformer: {
    // This detects entry points of React app and transforms them
    // For the other files this will switch to use default `metro-react-native-babel-transformer` for transforming
    babelTransformerPath: require.resolve('react-native-react-bridge/lib/plugin'),
    ...
  },
  rnrb: {
    // Set `true` if you use Preact in web side.
    // This will alias imports from `react` and `react-dom` to `preact/compat` automatically.
    preact: true
  },
  ...
};

Expo

const { getDefaultConfig } = require("expo/metro-config");

const config = getDefaultConfig(__dirname);

module.exports = {
  ...config,
  transformer: {
    ...config.transformer,
    babelTransformerPath: require.resolve(
      "react-native-react-bridge/lib/plugin"
    ),
  },
};

2. Make entry file for web app.

If you use React in web, import modules from react and react-native-react-bridge/lib/web.
If you use Preact in web, import modules from preact and react-native-react-bridge/lib/web/preact.
If you use Preact in web but with React aliases, import modules from react and react-native-react-bridge/lib/web.

// WebApp.js

import React, { useState } from "react";
import {
  webViewRender,
  emit,
  useNativeMessage,
} from "react-native-react-bridge/lib/web";
// Importing css is supported
import "./example.css";
// Images are loaded as base64 encoded string
import image from "./foo.png";

const Root = () => {
  const [data, setData] = useState("");
  // useNativeMessage hook receives message from React Native
  useNativeMessage((message) => {
    if (message.type === "success") {
      setData(message.data);
    }
  });
  return (
    <div>
      <img src={image} />
      <div>{data}</div>
      <button
        onClick={() => {
          // emit sends message to React Native
          //   type: event name
          //   data: some data which will be serialized by JSON.stringify
          emit({ type: "hello", data: 123 });
        }}
      />
    </div>
  );
};

// This statement is detected by babelTransformer as an entry point
// All dependencies are resolved, compressed and stringified into one file
export default webViewRender(<Root />);

3. Use the entry file in your React Native app with WebView.

// App.js

import React from "react";
import WebView from "react-native-webview";
import { useWebViewMessage } from "react-native-react-bridge";
import webApp from "./WebApp";

const App = () => {
  // useWebViewMessage hook create props for WebView and handle communication
  // The argument is callback to receive message from React
  const { ref, onMessage, emit } = useWebViewMessage((message) => {
    // emit sends message to React
    //   type: event name
    //   data: some data which will be serialized by JSON.stringify
    if (message.type === "hello" && message.data === 123) {
      emit({ type: "success", data: "succeeded!" });
    }
  });

  return (
    <WebView
      // ref, source and onMessage must be passed to react-native-webview
      ref={ref}
      // Pass the source code of React app
      source={{ html: webApp }}
      onMessage={onMessage}
    />
  );
};

4. Start your React Native app!

FAQs

My webview displays a blank page.

react-native-webview has some ways to show errors occurred in webview. This may be helpful to troubleshoot it.

https://github.com/react-native-webview/react-native-webview/blob/master/docs/Reference.md#onerror

Demo

This repository includes demo app.

React Native

Before running this app, please prepare environment for React Native (https://reactnative.dev/docs/environment-setup).

git clone git@github.com:inokawa/react-native-react-bridge.git
cd examples/DemoApp
yarn
yarn ios # or yarn android

Expo

git clone git@github.com:inokawa/react-native-react-bridge.git
cd examples/DemoAppExpo
yarn
expo start

Download Details:
Author: inokawa
Source Code: https://github.com/inokawa/react-native-react-bridge
License: MIT license

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Integrate Your React App Into React Native App with WebView

react-native-react-bridge

Why?

Features

Install

Requirements

Supported react-native versions

Usage

1. Fix metro.config.js to use babelTransformer from this library.

React Native

Expo

2. Make entry file for web app.

3. Use the entry file in your React Native app with WebView.

4. Start your React Native app!

FAQs

My webview displays a blank page.

Demo

React Native

Expo

What is GEEK

Buddha Community

How native is React Native? | React Native vs Native App Development

A brief introduction to React Native

Why React Native is fundamentally different from earlier hybrid frameworks

Top 10 React Native App Development Companies in USA

Hire Top-Notch React Native App Developers in USA

Top Rated React Native Development Agency

React Native Mobile App Development

1. Fix `metro.config.js` to use babelTransformer from this library.