[Solved]-Module not found: Error: Can't resolve 'zlib'-Reactjs

It's about Webpack 5 and its default config you use for React app. I followed an advice from here: https://github.com/nrwl/nx/issues/4817#issuecomment-824316899 and React NX docs for how to use custom webpack config.

Create a custom webpack config, say, in /apps/myapp/webpack.config.js and reference it in workspace.json instead of "webpackConfig": "@nrwl/react/plugins/webpack". It should be "webpackConfig": "apps/myapp/webpack.config.js".

Content for webpack.config.js:

const nrwlConfig = require("@nrwl/react/plugins/webpack.js");

module.exports = (config, context) => {
  // first call it so that @nrwl/react plugin adds its configs
  nrwlConfig(config);

  return {
    ...config,
    node: undefined
  };
};

So, this config change makes webpack correctly understand what polyfills are needed.

Alternatively, you can do the following:

const nrwlConfig = require("@nrwl/react/plugins/webpack.js");

module.exports = (config, context) => {
  // first call it so that @nrwl/react plugin adds its configs
  nrwlConfig(config);

  return {
    ...config,
    resolve: {
      ...config.resolve,
      alias: {
        ...config.resolve.alias,
        stream: require.resolve('stream-browserify'),
        zlib: require.resolve('browserify-zlib'),  
      }
    }
  };
};