text: "use strict";
  
  // Do this as the first thing so that any code reading it knows the right env.
  process.env.BABEL_ENV = "development";
  process.env.NODE_ENV = "development";
  
  process.on("unhandledRejection", (err) => {
    throw err;
  });
  
  // Ensure environment variables are read.
  require("../config/env");
  
  const fs = require("fs");
  const chalk = require("react-dev-utils/chalk");
  const webpack = require("webpack");
  const WebpackDevServer = require("webpack-dev-server");
  const clearConsole = require("react-dev-utils/clearConsole");
  const checkRequiredFiles = require("react-dev-utils/checkRequiredFiles");
  const {
    choosePort,
    createCompiler,
    prepareProxy,
    prepareUrls,
  } = require("react-dev-utils/WebpackDevServerUtils");
  const openBrowser = require("react-dev-utils/openBrowser");
  const paths = require("../config/paths");
  const configFactory = require("../config/webpack.config");
  const createDevServerConfig = require("../config/webpackDevServer.config");
  
  const useYarn = fs.existsSync(paths.yarnLockFile);
  const isInteractive = process.stdout.isTTY;
  
  // Warn and crash if required files are missing
  if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
    process.exit(1);
  }
  
  // Tools like Cloud9 rely on this.
  const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000; // TODO Change variable names
  const HOST = process.env.HOST || "0.0.0.0";
  
  if (process.env.HOST) {
    console.log(
      chalk.cyan(
        `Attempting to bind to HOST environment variable: ${chalk.yellow(
          chalk.bold(process.env.HOST)
        )}`
      )
    );
    console.log();
  }
  
  // We require that you explicitly set browsers and do not fall back to
  // browserslist defaults.
  const { checkBrowsers } = require("react-dev-utils/browsersHelper");
  checkBrowsers(paths.appPath, isInteractive)
    .then(() => {
      // We attempt to use the default port but if it is busy, we offer the user to
      // run on a different port. `choosePort()` Promise resolves to the next free port.
      return choosePort(HOST, DEFAULT_PORT);
    })
    .then((port) => {
      if (port == null) {
        // We have not found a port.
        return;
      }
  
      const config = configFactory("development");
      const protocol = process.env.HTTPS === "true" ? "https" : "http";
      const appName = "blogit";
      const useTypeScript = true;
      const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === "true";
      const urls = prepareUrls(
        protocol,
        HOST,
        port,
        paths.publicUrlOrPath.slice(0, -1)
      );
      const devSocket = {
        warnings: (warnings) =>
          devServer.sockWrite(devServer.sockets, "warnings", warnings),
        errors: (errors) =>
          devServer.sockWrite(devServer.sockets, "errors", errors),
      };
      // Create a webpack compiler that is configured with custom messages.
      const compiler = createCompiler({
        appName,
        config,
        devSocket,
        urls,
        useYarn,
        useTypeScript,
        tscCompileOnError,
        webpack,
      });
      // During development, webpack and flask run on different ports
      // while they are on same address in production mode. So, we will
      // have to proxy all calls to the API
      const proxySetting = `${protocol}://${
        process.env.FLASK_HOST || "localhost"
      }:${process.env.FLASK_PORT || 2811}`;
      const proxyConfig = prepareProxy(
        proxySetting,
        paths.appPublic,
        paths.publicUrlOrPath
      );
      // Serve webpack assets generated by the compiler over a web server.
      const serverConfig = createDevServerConfig(
        proxyConfig,
        urls.lanUrlForConfig
      );
      const devServer = new WebpackDevServer(compiler, serverConfig);
      // Launch WebpackDevServer.
      devServer.listen(port, HOST, (err) => {
        if (err) {
          return console.log(err);
        }
        if (isInteractive) {
          clearConsole();
        }
  
        console.log(chalk.cyan("Starting the development server...\n"));
        openBrowser(urls.localUrlForBrowser);
      });
  
      ["SIGINT", "SIGTERM"].forEach(function (sig) {
        process.on(sig, function () {
          devServer.close();
          process.exit();
        });
      });
  
      if (isInteractive || process.env.CI !== "true") {
        // Gracefully exit when stdin ends
        process.stdin.on("end", function () {
          devServer.close();
          process.exit();
        });
        process.stdin.resume();
      }
    })
    .catch((err) => {
      if (err && err.message) {
        console.log(err.message);
      }
      process.exit(1);
    });
  