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react-code-dataset / wp-calypso /client /server /bundler /index.js

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	const { execSync } = require( 'child_process' );
	const config = require( '@automattic/calypso-config' );
	const chalk = require( 'chalk' );
	const webpack = require( 'webpack' );
	const webpackMiddleware = require( 'webpack-dev-middleware' );
	const hotMiddleware = require( 'webpack-hot-middleware' );
	const webpackConfig = require( 'calypso/webpack.config' );

	const protocol = config( 'protocol' );
	const host = config( 'hostname' );
	const port = config( 'port' );
	const shouldProfile = process.env.PROFILE === 'true';
	const shouldBuildChunksMap =
	process.env.BUILD_TRANSLATION_CHUNKS === 'true' \|\|
	process.env.ENABLE_FEATURES === 'use-translation-chunks';

	function middleware( app ) {
	const compiler = webpack( webpackConfig );
	const callbacks = [];
	let built = false;
	let beforeFirstCompile = true;

	app.set( 'compiler', compiler );

	if ( shouldProfile ) {
	new compiler.webpack.ProgressPlugin( { profile: true } ).apply( compiler );
	}

	// In development environment we need to wait for initial webpack compile
	// to finish and execute the build-languages script if translation chunks
	// feature is enabled.
	if ( shouldBuildChunksMap ) {
	callbacks.push( () => {
	execSync( 'yarn run build-languages' );
	} );
	}

	compiler.hooks.done.tap( 'Calypso', function () {
	built = true;

	// Dequeue and call request handlers
	while ( callbacks.length > 0 ) {
	callbacks.shift()();
	}

	// In order to show our message after webpack's "bundle is now VALID"
	// we need to skip two event loop ticks, because webpack's callback is
	// also hooked on the "done" event, it calls nextTick to print the message
	// and runs before our callback (calls app.use earlier in the code)
	process.nextTick( function () {
	process.nextTick( function () {
	if ( beforeFirstCompile ) {
	beforeFirstCompile = false;
	console.info(
	chalk.cyan(
	`\nReady! You can load ${ protocol }://${ host }:${ port }/ now. Have fun!`
	)
	);
	} else {
	console.info( chalk.cyan( '\nReady! All assets are re-compiled. Have fun!' ) );
	}
	} );
	} );
	} );

	function waitForCompiler( request, response, next ) {
	if ( built ) {
	return next();
	}

	console.info(
	`Compiling assets... Wait until you see Ready! and then try ${ protocol }://${ host }:${ port }/ again.`
	);

	// a special message for newcomers, because seeing a blank page is confusing
	if ( request.url === '/' ) {
	response.send( `
	<head>
	<meta http-equiv="refresh" content="5">
	</head>
	<body>
	<h1>Welcome to Calypso!</h1>
	<p>
	Please wait until webpack has finished compiling and you see
	<code style="font-size: 1.2em; color: blue; font-weight: bold;">READY!</code> in
	the server console. This page should then refresh automatically. If it hasn’t, hit <em>Refresh</em>.
	</p>
	<p>
	In the meantime, try to follow all the emotions of the allmoji:
	<img src="https://emoji.slack-edge.com/T024FN1V2/allmoji/15b93529a828705f.gif"
	width="36" style="vertical-align: middle;">
	</body>
	` );
	} else {
	// Queue request handlers until the initial build is complete
	callbacks.push( waitForCompiler.bind( null, request, response, next ) );
	}
	}

	app.use( waitForCompiler );
	app.use( webpackMiddleware( compiler ) );
	app.use( hotMiddleware( compiler ) );
	}

	module.exports = middleware;