patch.js

var fs = require("fs");

function patchPackageJSON() {
  const packageJsonPath = "./package.json";
  fs.readFile(packageJsonPath, (err, data) => {
    if (err) {
      console.log(err);
    }
    var json = JSON.parse(data);
    json.browser = { fs: false, tls: false, net: false, utf8: false };
    fs.writeFileSync(packageJsonPath, JSON.stringify(json));
  });
}

function patchWebPackConfig() {
  const webpackPath =
    "node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js";
  const webpackPatch = `
     node: {
         crypto: true,
         http: true,
         https: true,
         stream: true,
         ws: true
     }`;

  fs.readFile(webpackPath, (err, data) => {
    if (err) {
      console.log(err);
    }
    const dataStr = data.toString("utf8");
    var replace = dataStr.replace("node: false,", webpackPatch);
    fs.writeFileSync(webpackPath, replace);
  });
}

patchWebPackConfig();
patchPackageJSON();