1

I was trying to build the react project using npm run build but it failed with the following messages.

❯ npm run build

> coin-web-test2@0.1.0 build
> react-scripts build

Creating an optimized production build...
Failed to compile.

Module not found: Error: Can't resolve 'crypto' in '/Users/...../node_modules/web3-eth-accounts/lib'
BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
        - add a fallback 'resolve.fallback: { "crypto": require.resolve("crypto-browserify") }'
        - install 'crypto-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
        resolve.fallback: { "crypto": false }
jonijeng
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1 Answers1

1

I tried to configure config-overrides.js and webpack.config.js with these commands (thanks to answer)

webpack.config.js:

module.exports = {
  resolve: {
    fallback: { crypto: false },
  },
};

However, I'm still receiving the same error.

Later on, I found that the default react-scripts bundled in node_module contains it's own webpack.config.js and it may interfere with mine. Not sure about this tbh. Would be nice if someone can explain.

And eventually, I changed the "scripts" in package.json to this and the error finally disappeared

  "scripts": {
    "start": "NODE_ENV=production node_modules/react-scripts/bin/react-scripts.js start",
    "build": "NODE_ENV=production node_modules/react-scripts/bin/react-scripts.js build",
    ....
  },
jonijeng
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