flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/Server.js

@@ -0,0 +1,126 @@
+'use strict';
+
+let serve = (() => {
+  var _ref = _asyncToGenerator(function* (bundler, port, useHTTPS = false) {
+    let handler = middleware(bundler);
+    let server;
+    if (!useHTTPS) {
+      server = http.createServer(handler);
+    } else if (typeof useHTTPS === 'boolean') {
+      server = https.createServer(generateCertificate(bundler.options), handler);
+    } else {
+      server = https.createServer((yield getCertificate(useHTTPS)), handler);
+    }
+
+    let freePort = yield getPort({ port });
+    server.listen(freePort);
+
+    return new Promise(function (resolve, reject) {
+      server.on('error', function (err) {
+        logger.error(new Error(serverErrors(err, server.address().port)));
+        reject(err);
+      });
+
+      server.once('listening', function () {
+        let addon = server.address().port !== port ? `- ${logger.chalk.yellow(`configured port ${port} could not be used.`)}` : '';
+
+        logger.persistent(`Server running at ${logger.chalk.cyan(`${useHTTPS ? 'https' : 'http'}://localhost:${server.address().port}`)} ${addon}`);
+
+        resolve(server);
+      });
+    });
+  });
+
+  return function serve(_x, _x2) {
+    return _ref.apply(this, arguments);
+  };
+})();
+
+function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }
+
+const http = require('http');
+const https = require('https');
+const serveStatic = require('serve-static');
+const getPort = require('get-port');
+const serverErrors = require('./utils/customErrors').serverErrors;
+const generateCertificate = require('./utils/generateCertificate');
+const getCertificate = require('./utils/getCertificate');
+const logger = require('./Logger');
+const path = require('path');
+const url = require('url');
+
+serveStatic.mime.define({
+  'application/wasm': ['wasm']
+});
+
+function setHeaders(res) {
+  enableCors(res);
+}
+
+function enableCors(res) {
+  res.setHeader('Access-Control-Allow-Origin', '*');
+  res.setHeader('Access-Control-Allow-Methods', 'GET, HEAD, PUT, PATCH, POST, DELETE');
+  res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept, Content-Type');
+}
+
+function middleware(bundler) {
+  const serve = serveStatic(bundler.options.outDir, {
+    index: false,
+    setHeaders: setHeaders
+  });
+
+  return function (req, res, next) {
+    // Wait for the bundler to finish bundling if needed
+    if (bundler.pending) {
+      bundler.once('bundled', respond);
+    } else {
+      respond();
+    }
+
+    function respond() {
+      var _url$parse = url.parse(req.url);
+
+      let pathname = _url$parse.pathname;
+
+      if (bundler.errored) {
+        return send500();
+      } else if (!pathname.startsWith(bundler.options.publicURL) || path.extname(pathname) === '') {
+        // If the URL doesn't start with the public path, or the URL doesn't
+        // have a file extension, send the main HTML bundle.
+        return sendIndex();
+      } else {
+        // Otherwise, serve the file from the dist folder
+        req.url = pathname.slice(bundler.options.publicURL.length);
+        return serve(req, res, send404);
+      }
+    }
+
+    function sendIndex() {
+      // If the main asset is an HTML file, serve it
+      if (bundler.mainBundle.type === 'html') {
+        req.url = `/${path.basename(bundler.mainBundle.name)}`;
+        serve(req, res, send404);
+      } else {
+        send404();
+      }
+    }
+
+    function send500() {
+      res.setHeader('Content-Type', 'text/plain; charset=utf-8');
+      res.writeHead(500);
+      res.end('🚨 Build error, check the console for details.');
+    }
+
+    function send404() {
+      if (next) {
+        return next();
+      }
+
+      res.writeHead(404);
+      res.end();
+    }
+  };
+}
+
+exports.middleware = middleware;
+exports.serve = serve;