Linking Local Packages in React Native the Right Way

https://medium.com/@alielmajdaoui/linking-local-packages-in-react-native-the-right-way-2ac6587dcfa2

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Step 1: Simply add the property watchFolders to the exports object. 

Your metro.config.js file should look something like:

// Absolute path to your package

const packagePath =

    '/Users/mac/my-own-packages/my-awesome-package';

module.exports = {

    resolver: {

        nodeModulesPaths: [packagePath],

        // rest of metro resolver options...

    },

    watchFolders: [packagePath],

    // rest of metro options...

};

Step 2:

npm install /Users/mac/my-own-packages/my-awesome-package