feat: new root/hot for better error management. Fixes #1078, #1111

Author: theKashey

Diff for: README.md

@@ -30,9 +30,10 @@ npm install react-hot-loader
 
 Latest (4.5.0+, beta) version of React-Hot-Loader could be quite 🔥!
 
-> RHL will patch React, React-DOM and work with fiber directly
+> RHL will patch React, replace React-DOM by React-🔥-DOM and work with fiber directly
 
 * (required) [use webpack plugin](https://github.com/gaearon/react-hot-loader#webpack-plugin) to let RHL patch React-DOM for you.
+* (alternative) [use react-🔥-dom](https://github.com/gaearon/react-hot-loader#react-hot-dom) to use already patched React-DOM.
 * (optional) [set configuration](https://github.com/gaearon/react-hot-loader#setconfigconfig) to `ignoreSFC:true` (this will fix `hook`)
 * (optional) [set configuration](https://github.com/gaearon/react-hot-loader#setconfigconfig) to `pureRender:true` (this will remove side effect from Classes)
 
@@ -60,11 +61,17 @@ setConfig({
 
 ```js
 // App.js
-import React from 'react'
-import { hot } from 'react-hot-loader'
-
+import { hot } from 'react-hot-loader/root'
 const App = () => <div>Hello World!</div>
+export default hot(App)
+```
+
+There is also another version of `hot`, used prior version 4.5.4. Please use a new one,
+as long is it much more resilient to js errors you may make during development.
 
+```js
+import { hot } from 'react-hot-loader'
+const App = () => <div>Hello World!</div>
 export default hot(module)(App)
 ```
 
@@ -241,6 +248,35 @@ module.exports = {
 }
 ```
 
+Webpack plugin will also land a "hot" patch to react-dom, making React-Hot-Loader more compliant to [the principles](https://github.com/gaearon/react-hot-loader/issues/1118).
+
+## React-🔥-Dom
+
+Another way to make RHL more compliant is to use _our_ version of React-Dom - [hot-loader/react-dom](https://github.com/hot-loader/react-dom)
+
+It is the same React-Dom, with the same version, just with our patches already landed inside.
+
+There is 2 ways to install it:
+
+* Use **yarn** name resolution, so `@hot-loader/react-dom` would be installed instead of `react-dom`
+
+```
+yarn add @hot-loader/react-dom@npm:react-dom
+```
+
+* Use webpack **aliases**
+
+```js
+// webpack.conf
+...
+resolve: {
+    alias: {
+      'react-dom': '@hot-loader/react-dom'
+    }
+}
+...
+```
+
 ### Code Splitting
 
 If you want to use Code Splitting + React Hot Loader, the simplest solution is to pick one of our compatible library:

Diff for: package.json

@@ -3,7 +3,7 @@
   "version": "4.5.3",
   "description": "Tweak React components in real time.",
   "main": "index.js",
-  "types": "react-hot-loader.d.ts",
+  "types": "index.d.ts",
   "homepage": "https://github.com/gaearon/react-hot-loader",
   "repository": "https://github.com/gaearon/react-hot-loader/",
   "license": "MIT",
@@ -33,7 +33,8 @@
     "babel.js",
     "webpack.js",
     "patch.js",
-    "react-hot-loader.d.ts"
+    "root.js",
+    "*.d.ts"
   ],
   "sideEffects": false,
   "keywords": [
@@ -49,6 +50,7 @@
     "reload"
   ],
   "devDependencies": {
+    "@types/react": "^16.7.13",
     "babel-cli": "^6.7.5",
     "babel-core": "^6.26.3",
     "babel-eslint": "^8.2.3",

Diff for: src/AppContainer.dev.js

@@ -3,6 +3,8 @@ import PropTypes from 'prop-types'
 import defaultPolyfill, { polyfill } from 'react-lifecycles-compat'
 import logger from './logger'
 import { get as getGeneration } from './global/generation'
+import configuration from './configuration'
+import { logException } from './errorReporter'
 
 class AppContainer extends React.Component {
   static getDerivedStateFromProps(nextProps, prevState) {
@@ -18,6 +20,7 @@ class AppContainer extends React.Component {
 
   state = {
     error: null,
+    errorInfo: null,
     // eslint-disable-next-line react/no-unused-state
     generation: 0,
   }
@@ -33,16 +36,27 @@ class AppContainer extends React.Component {
     return true
   }
 
-  componentDidCatch(error) {
+  componentDidCatch(error, errorInfo) {
     logger.error(error)
-    this.setState({ error })
+    const { errorReporter = configuration.errorReporter } = this.props
+    if (!errorReporter) {
+      logException(error, errorInfo)
+    }
+    this.setState({
+      error,
+      errorInfo,
+    })
   }
 
   render() {
-    const { error } = this.state
+    const { error, errorInfo } = this.state
+
+    const {
+      errorReporter: ErrorReporter = configuration.errorReporter,
+    } = this.props
 
-    if (this.props.errorReporter && error) {
-      return <this.props.errorReporter error={error} />
+    if (ErrorReporter && error) {
+      return <ErrorReporter error={error} errorInfo={errorInfo} />
     }
 
     if (this.hotComponentUpdate) {

Diff for: src/configuration.js

@@ -28,6 +28,9 @@ const configuration = {
 
   // flag to completely disable RHL for Components
   ignoreComponents: false,
+
+  // default value for AppContainer errorOverlay
+  errorReporter: undefined,
 }
 
 export default configuration

Diff for: src/global/modules.js

@@ -1,6 +1,7 @@
 import logger from '../logger'
 
 const openedModules = {}
+export let lastModuleOpened = ''
 
 const hotModules = {}
 
@@ -17,6 +18,7 @@ export const isOpened = sourceModule =>
   sourceModule && !!openedModules[sourceModule.id]
 
 export const enter = sourceModule => {
+  lastModuleOpened = sourceModule.id
   if (sourceModule && sourceModule.id) {
     openedModules[sourceModule.id] = true
   } else {

Diff for: src/hot.dev.js

@@ -3,14 +3,31 @@ import hoistNonReactStatic from 'hoist-non-react-statics'
 import { getComponentDisplayName } from './internal/reactUtils'
 import AppContainer from './AppContainer.dev'
 import reactHotLoader from './reactHotLoader'
-import { isOpened as isModuleOpened, hotModule } from './global/modules'
+import {
+  isOpened as isModuleOpened,
+  hotModule,
+  lastModuleOpened,
+} from './global/modules'
 import logger from './logger'
+import { clearExceptions, logException } from './errorReporter'
 
 /* eslint-disable camelcase, no-undef */
 const requireIndirect =
   typeof __webpack_require__ !== 'undefined' ? __webpack_require__ : require
 /* eslint-enable */
 
+const chargeFailbackTimer = id =>
+  setTimeout(() => {
+    logger.error(
+      `hot update failed for module "${id}". Last file processed: "${lastModuleOpened}".`,
+    )
+    logException({
+      toString: () => `hot update failed for module "${id}"`,
+    })
+  }, 0)
+
+const clearFailbackTimer = timerId => clearTimeout(timerId)
+
 const createHoc = (SourceComponent, TargetComponent) => {
   hoistNonReactStatic(TargetComponent, SourceComponent)
   TargetComponent.displayName = `HotExported${getComponentDisplayName(
@@ -34,15 +51,16 @@ const makeHotExport = sourceModule => {
   }
 
   if (sourceModule.hot) {
-    // Mark as self-accepted for Webpack
-    // Update instances for Parcel
+    // Mark as self-accepted for Webpack (callback is an Error Handler)
+    // Update instances for Parcel (callback is an Accept Handler)
     sourceModule.hot.accept(updateInstances)
 
     // Webpack way
     if (sourceModule.hot.addStatusHandler) {
       if (sourceModule.hot.status() === 'idle') {
         sourceModule.hot.addStatusHandler(status => {
           if (status === 'apply') {
+            clearExceptions()
             updateInstances()
           }
         })
@@ -62,9 +80,13 @@ const hot = sourceModule => {
   const module = hotModule(moduleId)
   makeHotExport(sourceModule)
 
+  clearExceptions()
+  const failbackTimer = chargeFailbackTimer(sourceModule.id)
+
   // TODO: Ensure that all exports from this file are react components.
 
   return WrappedComponent => {
+    clearFailbackTimer(failbackTimer)
     // register proxy for wrapped component
     reactHotLoader.register(
       WrappedComponent,

Diff for: src/reactHotLoader.js

@@ -233,6 +233,13 @@ const reactHotLoader = {
         configuration.disableHotRendererWhenInjected
 
       reactHotLoader.IS_REACT_MERGE_ENABLED = true
+      console.info(
+        'React-Hot-Loader: react-🔥-dom patch detected. You may use all the features.',
+      )
+    } else {
+      console.warn(
+        'React-Hot-Loader: react-🔥-dom patch is not detected. React 16.6+ features may not work.',
+      )
     }
     if (!React.createElement.isPatchedByReactHotLoader) {
       const originalCreateElement = React.createElement

Diff for: yarn.lock

@@ -106,6 +106,19 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-8.0.53.tgz#396b35af826fa66aad472c8cb7b8d5e277f4e6d8"
   integrity sha512-54Dm6NwYeiSQmRB1BLXKr5GELi0wFapR1npi8bnZhEcu84d/yQKqnwwXQ56hZ0RUbTG6L5nqDZaN3dgByQXQRQ==
 
+"@types/prop-types@*":
+  version "15.5.7"
+  resolved "https://registry.yarnpkg.com/@types/prop-types/-/prop-types-15.5.7.tgz#c6f1e0d0109ff358b132d98b7b4025c7a7b707c5"
+  integrity sha512-a6WH0fXkgPNiGIuLjjdpf0n/GnmgWZ4vLuVIJJnDwhmRDPEaiRBcy5ofQPh+EJFua0S1QWmk1745+JqZQGnJ8Q==
+
+"@types/react@^16.7.13":
+  version "16.7.13"
+  resolved "https://registry.yarnpkg.com/@types/react/-/react-16.7.13.tgz#d2369ae78377356d42fb54275d30218e84f2247a"
+  integrity sha512-WhqrQLAE9z65hfcvWqZfR6qUtIazFRyb8LXqHo8440R53dAQqNkt2OlVJ3FXwqOwAXXg4nfYxt0qgBvE18o5XA==
+  dependencies:
+    "@types/prop-types" "*"
+    csstype "^2.2.0"
+
 JSONStream@^1.0.4:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/JSONStream/-/JSONStream-1.3.1.tgz#707f761e01dae9e16f1bcf93703b78c70966579a"
@@ -1947,6 +1960,11 @@ [email protected], "cssom@>= 0.3.2 < 0.4.0":
   dependencies:
     cssom "0.3.x"
 
+csstype@^2.2.0:
+  version "2.5.8"
+  resolved "https://registry.yarnpkg.com/csstype/-/csstype-2.5.8.tgz#4ce5aa16ea0d562ef9105fa3ae2676f199586a35"
+  integrity sha512-r4DbsyNJ7slwBSKoGesxDubRWJ71ghG8W2+1HcsDlAo12KGca9dDLv0u98tfdFw7ldBdoA7XmCnI6Q8LpAJXaQ==
+
 currently-unhandled@^0.4.1:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/currently-unhandled/-/currently-unhandled-0.4.1.tgz#988df33feab191ef799a61369dd76c17adf957ea"
@@ -5553,15 +5571,15 @@ rc@^1.1.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-react-dom@16:
-  version "16.6.0"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.6.0.tgz#6375b8391e019a632a89a0988bce85f0cc87a92f"
-  integrity sha512-Stm2D9dXEUUAQdvpvhvFj/DEXwC2PAL/RwEMhoN4dvvD2ikTlJegEXf97xryg88VIAU22ZAP7n842l+9BTz6+w==
+react-dom@^16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.6.3.tgz#8fa7ba6883c85211b8da2d0efeffc9d3825cccc0"
+  integrity sha512-8ugJWRCWLGXy+7PmNh8WJz3g1TaTUt1XyoIcFN+x0Zbkoz+KKdUyx1AQLYJdbFXjuF41Nmjn5+j//rxvhFjgSQ==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
     prop-types "^15.6.2"
-    scheduler "^0.10.0"
+    scheduler "^0.11.2"
 
 react-is@^16.5.2, react-is@^16.6.0:
   version "16.6.0"
@@ -5602,15 +5620,15 @@ react-test-renderer@^16.0.0-0:
     object-assign "^4.1.1"
     prop-types "^15.6.0"
 
-react@16:
-  version "16.6.0"
-  resolved "https://registry.yarnpkg.com/react/-/react-16.6.0.tgz#b34761cfaf3e30f5508bc732fb4736730b7da246"
-  integrity sha512-zJPnx/jKtuOEXCbQ9BKaxDMxR0001/hzxXwYxG8septeyYGfsgAei6NgfbVgOhbY1WOP2o3VPs/E9HaN+9hV3Q==
+react@^16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.6.3.tgz#25d77c91911d6bbdd23db41e70fb094cc1e0871c"
+  integrity sha512-zCvmH2vbEolgKxtqXL2wmGCUxUyNheYn/C+PD1YAjfxHC54+MhdruyhO7QieQrYsYeTxrn93PM2y0jRH1zEExw==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
     prop-types "^15.6.2"
-    scheduler "^0.10.0"
+    scheduler "^0.11.2"
 
 read-pkg-up@^1.0.1:
   version "1.0.1"
@@ -6161,6 +6179,14 @@ scheduler@^0.10.0:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
 
+scheduler@^0.11.2:
+  version "0.11.3"
+  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.11.3.tgz#b5769b90cf8b1464f3f3cfcafe8e3cd7555a2d6b"
+  integrity sha512-i9X9VRRVZDd3xZw10NY5Z2cVMbdYg6gqFecfj79USv1CFN+YrJ3gIPRKf1qlY+Sxly4djoKdfx1T+m9dnRB8kQ==
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+
 semver-compare@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/semver-compare/-/semver-compare-1.0.0.tgz#0dee216a1c941ab37e9efb1788f6afc5ff5537fc"