Polyfill Guide: Solana web3.js

This guide will teach you how to set up the Solana web3.js library with the necessary polyfills in a React Native or Expo app.

Installation

Add the library to your project:

yarn

yarn add @solana/web3.js

npm

npm install @solana/web3.js

Polyfills

The following polyfills are needed, only if you intend to use the Keypair.generate function. Otherwise, this polyfill is not required to use @solana/web3.js.

Install getRandomValues

Add the react-native-get-random-values library to your project.

yarn

yarn add react-native-get-random-values

npm

npm install react-native-get-random-values

Then, import the library in your app's entrypoint file (e.g index.js), before the @solana/web3.js library is imported.

import "react-native-get-random-values";
// ...other imports below

tip

Alternatively, you can use the expo-crypto library to polyfill crypto.getRandomValues. View this sample app for a reference of how to polyfill the crypto class.

Example