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webpackHotDevClient.js 6.58 KiB
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/**
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 * Copyright (c) 2015-present, Facebook, Inc.
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 * All rights reserved.
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 *
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 * This source code is licensed under the BSD-style license found in the
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 * LICENSE file in the root directory of this source tree. An additional grant
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 * of patent rights can be found in the PATENTS file in the same directory.
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 */
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// This alternative WebpackDevServer combines the functionality of:
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// https://github.com/webpack/webpack-dev-server/blob/webpack-1/client/index.js
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// https://github.com/webpack/webpack/blob/webpack-1/hot/dev-server.js
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// It only supports their simplest configuration (hot updates on same server).
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// It makes some opinionated choices on top, like adding a syntax error overlay
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// that looks similar to our console output. The error overlay is inspired by:
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// https://github.com/glenjamin/webpack-hot-middleware
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var ansiHTML = require('ansi-html');
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var SockJS = require('sockjs-client');
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var stripAnsi = require('strip-ansi');
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var url = require('url');
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var formatWebpackMessages = require('./formatWebpackMessages');
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var Entities = require('html-entities').AllHtmlEntities;
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var entities = new Entities();
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// Color scheme inspired by https://github.com/glenjamin/webpack-hot-middleware
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var colors = {
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  reset: ['transparent', 'transparent'],
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  black: '181818',
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  red: 'E36049',
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  green: 'B3CB74',
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  yellow: 'FFD080',
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  blue: '7CAFC2',
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  magenta: '7FACCA',
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  cyan: 'C3C2EF',
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  lightgrey: 'EBE7E3',
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  darkgrey: '6D7891'
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};
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ansiHTML.setColors(colors);
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function showErrorOverlay(message) {
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  // Use an iframe so that document styles don't mess up the overlay.
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  var iframeID = 'react-dev-utils-webpack-hot-dev-client-overlay';
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  var iframe =
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    document.getElementById(iframeID) ||
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    document.createElement('iframe');
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  iframe.id = iframeID;
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  iframe.style.position = 'fixed';
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  iframe.style.left = 0;
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  iframe.style.top = 0;
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  iframe.style.right = 0;
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  iframe.style.bottom = 0;
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  iframe.style.width = '100vw';
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  iframe.style.height = '100vh';
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  iframe.style.border = 'none';
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  iframe.style.zIndex = 9999999999;
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  document.body.appendChild(iframe);
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  // Inside, make a div.
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  var overlayID = 'react-dev-utils-webpack-hot-dev-client-overlay-div';
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  var overlay =
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    iframe.contentDocument.getElementById(overlayID) ||
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    iframe.contentDocument.createElement('div');
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  overlay.id = overlayID;
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  overlay.style.position = 'fixed';
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  overlay.style.left = 0;
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  overlay.style.top = 0;
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  overlay.style.right = 0;
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  overlay.style.bottom = 0;
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overlay.style.width = '100vw'; overlay.style.height = '100vh'; overlay.style.backgroundColor = 'black'; overlay.style.color = '#E8E8E8'; overlay.style.fontFamily = 'Menlo, Consolas, monospace'; overlay.style.fontSize = 'large'; overlay.style.padding = '2rem'; overlay.style.lineHeight = '1.2'; overlay.style.whiteSpace = 'pre-wrap'; overlay.style.overflow = 'auto'; // Make it look similar to our terminal. overlay.innerHTML = '<span style="color: #' + colors.red + '">Failed to compile.</span><br><br>' + ansiHTML(entities.encode(message)); // Render! iframe.contentDocument.body.appendChild(overlay); } // Connect to WebpackDevServer via a socket. var connection = new SockJS(url.format({ protocol: window.location.protocol, hostname: window.location.hostname, port: window.location.port, // Hardcoded in WebpackDevServer pathname: '/sockjs-node' })); // Note: unlike WebpackDevServer's built-in client, // we don't handle disconnect. If connection fails, // just leave it instead of spamming the console. // Remember some state related to hot module replacement. var isFirstCompilation = true; var mostRecentCompilationHash = null; // Successful compilation. function handleSuccess() { var isHotUpdate = !isFirstCompilation; isFirstCompilation = false; // Attempt to apply hot updates or reload. if (isHotUpdate) { tryApplyUpdates(); } } // Compilation with warnings (e.g. ESLint). function handleWarnings(warnings) { var isHotUpdate = !isFirstCompilation; isFirstCompilation = false; function printWarnings() { // Print warnings to the console. for (var i = 0; i < warnings.length; i++) { console.warn(stripAnsi(warnings[i])); } } // Attempt to apply hot updates or reload. if (isHotUpdate) { tryApplyUpdates(function onSuccessfulHotUpdate() { // Only print warnings if we aren't refreshing the page. // Otherwise they'll disappear right away anyway. printWarnings(); }); } else { // Print initial warnings immediately.
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printWarnings(); } } // Compilation with errors (e.g. syntax error or missing modules). function handleErrors(errors) { isFirstCompilation = false; // "Massage" webpack messages. var formatted = formatWebpackMessages({ errors: errors, warnings: [] }); // Only show the first error. showErrorOverlay(formatted.errors[0]); // Do not attempt to reload now. // We will reload on next success instead. } // There is a newer version of the code available. function handleAvailableHash(hash) { // Update last known compilation hash. mostRecentCompilationHash = hash; } // Handle messages from the server. connection.onmessage = function(e) { var message = JSON.parse(e.data); switch (message.type) { case 'hash': handleAvailableHash(message.data); break; case 'ok': handleSuccess(); break; case 'warnings': handleWarnings(message.data); break; case 'errors': handleErrors(message.data); break; default: // Do nothing. } } // Is there a newer version of this code available? function isUpdateAvailable() { /* globals __webpack_hash__ */ // __webpack_hash__ is the hash of the current compilation. // It's a global variable injected by Webpack. return mostRecentCompilationHash !== __webpack_hash__; } // Webpack disallows updates in other states. function canApplyUpdates() { return module.hot.status() === 'idle'; } // Attempt to update code on the fly, fall back to a hard reload. function tryApplyUpdates(onHotUpdateSuccess) { if (!module.hot) { // HotModuleReplacementPlugin is not in Webpack configuration. window.location.reload(); return; } if (!isUpdateAvailable() || !canApplyUpdates()) { return;
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} // https://webpack.github.io/docs/hot-module-replacement.html#check module.hot.check(/* autoApply */true, function(err, updatedModules) { if (err || !updatedModules) { window.location.reload(); return; } if (typeof onHotUpdateSuccess === 'function') { // Maybe we want to do something. onHotUpdateSuccess(); } if (isUpdateAvailable()) { // While we were updating, there was a new update! Do it again. tryApplyUpdates(); } }); };