React-native-package NPM

react-native-package

Provides a consistent format to define and export packages for React Native.

Getting Started

Install react-native-package using yarn:

yarn add react-native-package

Motivation

This package (pun intended) addresses several issues when creating a NativeModule for React Native:

Consistent way of checking if a NativeModule was installed correctly.
Allows 'guarding' a module on a platform that it has not been implemented on yet.
Helpful error messages when a module has not been implemented on a platform.

Usage

This is an example from the react-native-instabug-sdk which was the motivation for this package.

import {Platform} from 'react-native';
import Package from 'react-native-package';


export default Package.create({
  json: require('./package.json'),
  nativeModule: NativeModules.RNInstabugSDK,
  enabled: Platform.select({
    ios: true,
  }),
  export: (Instabug) => ({
    // Constants that this module exports.
    events: {
      ...
    },
    modes: {
      ...
    },

    // All methods that this NativeModule is supposed to export:
    startWithToken: (token, event) => Instabug.startWithToken(token, event),
  }),
});

Using values from the package.json, we can record a consistent warning if we determine this package was not installed correctly:

Warning: react-native-instabug-sdk was not installed correctly. Please follow the instructions in the README: https://github.com/negativetwelve/react-native-instabug-sdk#readme.

It will also record a message if the Package is not enabled on the current platform:

Warning: react-native-instabug-sdk does not currently have an implementation for Android. If you would like to contribute, please submit a PR to https://github.com/negativetwelve/react-native-instabug-sdk.

But, calling a method on that platform, Android in this case, such as:

import React from 'react';
import Instabug from 'react-native-instabug-sdk';


export default class App extends React.Component {
  componentDidMount() {
    Instabug.startWithToken(TOKEN, EVENT);
  }

  render() {
    return (
      <Text>Testing Instabug</Text>
    );
  }
}

will not error! :tada: