Troubleshooting bundling with Webpack

Webpack > 5 ESM

For any project using Webpack, you´ll need the following rule in your webpack.config.js above version 5:


{
        test: /\.(m?js)$/,
        resolve: {
          fullySpecified: false
        }
}

Create-react-app

General cases

To use Webpack with the code from the step-by-step examples section:


npx create-react-app nymapp --template typescript
cd nymapp

Install the required dependencies, then paste the code from the step-by-step section into your app’s App.tsx.

Contract client

With webpack, the Contract client for querying or executing may need polyfills. Since create-react-app doesn’t expose the Webpack config without ejecting, override it as follows:

Install contract-clients dependencies


npm install @nymproject/contract-clients @cosmjs/cosmwasm-stargate @cosmjs/proto-signing

In your app’s App.tsx, replace the existing code with the code from the step-by-step examples section.

Polyfilling

Copy the following to your terminal and run:


npm install react-app-rewired
npm install --save-dev crypto-browserify stream-browserify assert stream-http https-browserify os-browserify url buffer process
cat <<EOF > config-overrides.js
const webpack = require('webpack');
const path = require('path')
 
module.exports = function override(config) {
  const fallback = config.resolve.fallback || {};
  Object.assign(fallback, {
    "crypto": require.resolve("crypto-browserify"),
    "stream": require.resolve("stream-browserify"),
    "assert": require.resolve("assert"),
    "http": require.resolve("stream-http"),
    "https": require.resolve("https-browserify"),
    "os": require.resolve("os-browserify"),
    "url": require.resolve("url")
  })
  config.resolve.fallback = fallback;
  config.plugins = (config.plugins || []).concat([
    new webpack.ProvidePlugin({
      process: 'process/browser',
      Buffer: ['buffer', 'Buffer']
    })
  ])
  config.module.rules = (config.module.rules || []).concat([
      {
        test: /\.(m?js)$/,
        resolve: {
          fullySpecified: false
        }
      }
    ])
  return config;
}
EOF

Edit the `package.json` file as follows:


  "scripts": {
    "start": "react-app-rewired start",
    "build": "react-app-rewired build",
    "test": "react-app-rewired test",
    "eject": "react-scripts eject"
  },