Can't resolve 'crypto'

If you’re using Solana, you may encounter an error like this:

Module not found: Can't resolve 'crypto'

This is because you need to polyfill the crypto module. If you’re using webpack for example, your webpack config should look something like this:

const webpack = require('webpack');

module.exports = {
  resolve: {
    fallback: {
      "crypto": require.resolve("crypto-browserify"),
      "stream": require.resolve("stream-browserify"),
      "buffer": require.resolve("buffer/")
    }
  },
  plugins: [
    new webpack.ProvidePlugin({
      Buffer: ['buffer', 'Buffer'],
    }),
  ]
};