How to use the react-dev-utils/browsersHelper.checkBrowsers function in react-dev-utils

async function main() {
  checkBrowsers(paths.appPath, isInteractive)
    .then(() => (currentProject.argv.force ? true : currentProject.checkForExistingBuild()))
    .then(buildRequired => {
      if (!buildRequired) {
        console.log('This project has already been built.  Pass --force to build anyway.')
        process.exit(0)
      }
      return true
    })
    .then(() => currentProject.checkCache())
    .then(() => {
      // First, read the current file sizes in build directory.
      // This lets us display how much they changed later.
      return measureFileSizesBeforeBuild(paths.appBuild)
    })
    .then(previousFileSizes => {
      // Remove all content but keep the directory so that

)}`
    )
  );
  console.log(
    `If this was unintentional, check that you haven't mistakenly set it in your shell.`
  );
  console.log(
    `Learn more here: ${chalk.yellow('http://bit.ly/CRA-advanced-config')}`
  );
  console.log();
}

// We require that you explictly 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 = require(paths.appPackageJson).name;
    const urls = prepareUrls(protocol, HOST, port);
    // Create a webpack compiler that is configured with custom messages.
    const compiler = createCompiler(webpack, config, appName, urls, useYarn);

if (!checkRequiredFiles([paths.appHtml, paths.appWebIndexJs])) {
  process.exit(1);
}

// Process CLI arguments
const argv = process.argv.slice(2);
const writeStatsJson = argv.indexOf('--stats') !== -1;

// Generate configuration
const webConfig = configFactory('production', 'web');
const nodeConfig = configFactory('production', 'node');

// 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(() => {
    // First, read the current file sizes in build directory.
    // This lets us display how much they changed later.
    return measureFileSizesBeforeBuild(paths.appWebBuild);
  })
  .then(previousFileSizes => {
    // Remove all content but keep the directory so that
    // if you're in it, you don't end up in Trash
    fs.emptyDirSync(paths.appWebBuild);
    if (paths.appNodeBuild) {
      fs.emptyDirSync(paths.appNodeBuild);
    }
    // Merge with the public folder
    copyPublicFolder();
    // Start the webpack build
    return build(previousFileSizes);

// Warn and crash if required files are missing
if ( ! checkRequiredFiles( [ paths.appHtml, paths.appIndexJs ] ) ) {
	process.exit( 1 );
}

// Process CLI arguments
const argv = process.argv.slice( 2 );
const writeStatsJson = argv.indexOf( "--stats" ) !== -1;

// Generate configuration
const config = configFactory( "production" );

// 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( () => {
		// First, read the current file sizes in build directory.
		// This lets us display how much they changed later.
		return measureFileSizesBeforeBuild( paths.appBuild );
	} )
	.then( previousFileSizes => {
		// Remove all content but keep the directory so that
		// If you're in it, you don't end up in Trash
		fs.emptyDirSync( paths.appBuild );
		// Merge with the public folder
		copyPublicFolder();
		// Start the webpack build
		return build( previousFileSizes );
	} )
	.then(
		( { stats, previousFileSizes, warnings } ) => {

)}`
    )
  );
  console.log(
    `If this was unintentional, check that you haven't mistakenly set it in your shell.`
  );
  console.log(
    `Learn more here: ${chalk.yellow('https://bit.ly/CRA-advanced-config')}`
  );
  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 = require(paths.appPackageJson).name;
    const useTypeScript = fs.existsSync(paths.appTsConfig);
    const urls = prepareUrls(protocol, HOST, port);
    const devSocket = {

),
  );
  console.log(
    'If this was unintentional, check that you haven\'t mistakenly set it in your shell.',
  );
  console.log(
    `Learn more here: ${chalk.yellow('http://bit.ly/CRA-advanced-config')}`,
  );
  console.log();
}

// We require that you explictly set browsers and do not fall back to
// browserslist defaults.
const { checkBrowsers } = require('react-dev-utils/browsersHelper');

checkBrowsers(paths.appPath, isInteractive)
  .then(() => choosePort(HOST, DEFAULT_PORT),
  )
  .then((port) => {
    if (port == null) {
      // We have not found a port.
      return;
    }
    const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
    const appName = require(paths.appPackageJson).name;
    const urls = prepareUrls(protocol, HOST, port);
    // Create a webpack compiler that is configured with custom messages.
    const compiler = createCompiler(webpack, config, appName, urls, useYarn);
    // Load proxy config
    const proxySetting = require(paths.appPackageJson).proxy;
    const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
    // Serve webpack assets generated by the compiler over a web server.

)}`
    )
  );
  console.log(
    `If this was unintentional, check that you haven't mistakenly set it in your shell.`
  );
  console.log(
    `Learn more here: ${chalk.yellow('https://bit.ly/CRA-advanced-config')}`
  );
  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 = require(paths.appPackageJson).name;
    const useTypeScript = fs.existsSync(paths.appTsConfig);
    const urls = prepareUrls(protocol, HOST, port);
    const devSocket = {

const isInteractive = process.stdout.isTTY;

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
  process.exit(1);
}

// Process CLI arguments
const argv = process.argv.slice(2);
const writeStatsJson = argv.indexOf('--stats') !== -1;

// We require that you explictly set browsers and do not fall back to
// browserslist defaults.
const { checkBrowsers } = require('react-dev-utils/browsersHelper');
checkBrowsers(paths.appPath, isInteractive)
  .then(() => {
    // First, read the current file sizes in build directory.
    // This lets us display how much they changed later.
    return measureFileSizesBeforeBuild(paths.appBuild);
  })
  .then(previousFileSizes => {
    // Remove all content but keep the directory so that
    // if you're in it, you don't end up in Trash
    fs.emptyDirSync(paths.appBuild);
    // Merge with the public folder
    copyPublicFolder();
    // Start the webpack build
    return build(previousFileSizes);
  })
  .then(
    ({ stats, previousFileSizes, warnings }) => {

)}`
    )
  )
  console.log(
    `If this was unintentional, check that you haven't mistakenly set it in your shell.`
  )
  console.log(
    `Learn more here: ${chalk.yellow('http://bit.ly/CRA-advanced-config')}`
  )
  console.log()
}

// We require that you explictly 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 = require(paths.appPackageJson).name
    const urls = prepareUrls(protocol, HOST, port)
    // Create a webpack compiler that is configured with custom messages.
    const compiler = createCompiler(webpack, config, appName, urls, useYarn)

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
  process.exit(1);
}

// Process CLI arguments
const argv = process.argv.slice(2);
const writeStatsJson = argv.indexOf('--stats') !== -1;

// Generate configuration
const config = configFactory('production');

// 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(() => {
    // First, read the current file sizes in build directory.
    // This lets us display how much they changed later.
    return measureFileSizesBeforeBuild(paths.appBuild);
  })
  .then(previousFileSizes => {
    // Remove all content but keep the directory so that
    // if you're in it, you don't end up in Trash
    fs.emptyDirSync(paths.appBuild);
    // Merge with the public folder
    copyPublicFolder();
    // Start the webpack build
    return build(previousFileSizes);
  })
  .then(
    ({ stats, previousFileSizes, warnings }) => {