I'm using Webpack 4 to create a React project with hooks and I'm trying to get the changes to reload on page live using react-hot-loader following this tutorial.
But I when I try npm start I get following error on the browser:
Error: React-hot-loader: hot could not find the name of the the
module you have provided
This is my App.js contents:
import React from 'react';
import { hot } from 'react-hot-loader';
import Header from './Header';
function App() {
return (
<section className="main">
<Header />
</section>
);
}
export default hot(App);
Alternately I tried importing hot from react-hot-loader/root, but this way I get a different error:
Error: React-Hot-Loader: react-hot-loader/root is not supported on
your system. Please use import {hot} from "react-hot-loader" instead
How could I solve this issue?
You should be requiring it before react:
import { hot } from 'react-hot-loader/root';
import React from 'react';
The package documentation mentions this.
Well, looking at my webpack configs:
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.DefinePlugin({ 'process.env.NODE_ENV': JSON.stringify(env.NODE_ENV) }),
],
devServer: {
contentBase: './dist',
hot: true,
},
I had used webpack.HotModuleReplacementPlugin() in plugins and hot: true in devServer which made the second error if I would use react-hot-loader/root.
So removing new webpack.HotModuleReplacementPlugin() from the webpack.config.js, solved my problem.
import { hot } from 'react-hot-loader';
export default hot(module)(App);
or
import { hot } from 'react-hot-loader/root';
export default hot(App);
Related
I'm struggling to import SVG's when I'm using craco in my react app.
It's suggested to use #svgr/webpack but I'm not sure how to put it into my craco.config.js
My current setup as per this (I prob shouldn't follow someone's config that doesn't work and expect it to work tho) that does not work:
// craco.config.js
const CracoAlias = require("craco-alias");
module.exports = {
plugins: [
{
plugin: CracoAlias,
options: {
source: "tsconfig",
baseUrl: "./src",
tsConfigPath: "./tsconfig.paths.json"
}
},
],
webpack: {
configure: (config, { env, paths }) => {
config.module.rules.push({
test: /\.svg$/,
use: ["#svgr/webpack"]
});
return config;
}
}
};
The craco.config.js webpack documentation is here but it's so confusing to me without concrete examples.
Also to note:
Writing import {ReactComponent as mySvg} from "./mySvg.svg" doesn't work because it doesn't recognize it as a ReactComponent.
If I try importing directly via import mySvg from "./mySvg.svg" Typescript doesn't recognize the file.
What I'm currently doing is putting the svg into a React component and using that but it's a nightmare doing that every time. I also put this in #types/custom.d.ts, but it still doesn't work when put into <img src={mySvg} />
// #types/custom.d.ts
declare module "*.svg" {
const content: any;
export default content;
}
import {reactComponent as GoogleLogo} from "../assets/image/googlelogo.svg;
GoogleLogo is component and reactComponent is a required magic string
i find the fix your problem in Adding svgr to create-react-app via craco
Here is my rollup config
// rollup.config.js
const postcss = require('rollup-plugin-postcss');
const autoprefixer = require('autoprefixer');
module.exports = {
rollup(config, _options) {
config.plugins.push(
postcss({
plugins: [
autoprefixer(),
],
extensions: ['.css'],
modules: false,
extract: false,
}),
);
return config;
},
};
So if I import css file local from a relative path, it gets injected but I import from node_modules it doesn't
import React from 'react';
import { toast } from 'react-toastify';
import 'react-toastify/dist/ReactToastify.css';
// The following works if I copy the file locally
// import './ReactToastify.css';
What am I doing wrong here?
I came across exactly the same problem and I think I found the solution. The trick here is to use rollup-plugin-postcss (or also rollup-plugin-styles) in combination with #rollup/plugin-node-resolve.
My rollup.config.js looks something like this:
import { nodeResolve } from '#rollup/plugin-node-resolve'
import postcss from 'rollup-plugin-postcss'
// import styles from 'rollup-plugin-styles'
export default {
...
plugins: [
postcss(),
// styles(),
nodeResolve({
extensions: ['.css']
})
]
};
As far as I can tell, for my simple case, it doesn't matter if you use postcss or styles plugins. Both work the same.
I am trying to dynamically import react component library from API. The js file is fetched succesfully. The babel transpilation has happened successfully too. If I dynamically import the Dummy.js file from localhost like import Dummy from './components/js/Dummy.js', it works. However API import fails with below error. The same error occurs with react lazy too. I basically want to dynamically load the lib and publish events to it. I am newbie to react and front-end development. Please excuse if this is too silly!.
Error resolving module specifier: react
My App.js
import React, { lazy, Suspense } from 'react';
import './App.css';
import ErrorBoundary from './ErrorBoundary';
class App extends React.Component {
render(){
const loader = () => import( /*webpackIgnore: true*/ `https://example.com/Dummy.js`);
const Dummy = ReactDynamicImport({ loader });
const LoadingMessage = () => (
"I'm loading..."
)
return (
<div className="App">
<h1>Simplewidget</h1>
<div id="simplewidget">
<ErrorBoundary>
<Suspense fallback={LoadingMessage}>
<Dummy />
</Suspense>
</ErrorBoundary>
</div>
</div>
);
}
}
export default App;
rollup.config.js, After multiple attempts I arrived at below configuration https://github.com/jaebradley/example-rollup-react-component-npm-package/blob/master/rollup.config.js
// node-resolve will resolve all the node dependencies
import resolve from '#rollup/plugin-node-resolve';
import babel from 'rollup-plugin-babel';
import commonjs from '#rollup/plugin-commonjs';
import filesize from 'rollup-plugin-filesize';
import localResolve from 'rollup-plugin-local-resolve';
export default {
input: 'src/components/js/Dummy.js',
output: {
file: 'dist/Dummy.js',
format: 'es',
globals: {
react: 'React',
'react-dom': 'ReactDOM'
}
},
// All the used libs needs to be here
external: [
'react',
'react-dom'
],
plugins: [
babel({
exclude: 'node_modules/**',
}),
localResolve(),
resolve({
browser: true,
}),
commonjs(),
filesize()
]
}
Dummy.js. I verified in dist/dummy.js that babel transpilation happened correctly. I uploaded the transpiled version to my static hosting site.
import React from "react";
import ReactDOM from "react-dom";
class Dummy extends React.Component {
render() {
return (
<h1>Hello</h1>
);
}
}
export default Dummy;
I have different targets to build, start up my server, create rollup bundle, etc in same app. So, I am pretty confident my rollup doesn't interfere with running the app.
The rollup bundling configuration isn't correct. I was trying to create an es output with commonjs plugin while actually I required an esm module. The error on 'react' is because it is unresolved. Had to make it to use window.React while doing rollup bundle. Also, the App.js should be rolled up as esm bundle to make it dynamically import Dummy.js. In the HTML where app.js's bundle is included, I had to include react and react js umd scripts.
export default {
input: "./src/components/js/Dummy.js",
output: {
file: './dist/Dummy.js',
format: 'esm'
},
plugins: [
babel({
exclude: "node_modules/**"
}),
resolve(),
externalGlobals({
"react": "window.React",
"react-dom": "window.ReactDOM",
})
]
};
I'm trying to convert a working ReactJS application into TypeScript, and I've had some issues getting anything to work properly.
import React from "react";
import * as ReactDOM from "react-dom";
import Application from "./Application";
console.log(React); // undefined
ReactDOM.render(
<Application/>, window.document.getElementById("application-wrapper")
);
The console throws an error at <Application />
When I import react like this, react loads:
import * as React from "react";
However, I want to use the import statement using the default export, because I import React using this import syntax in all the existing components:
import React, {Component} from "react";
export default class Whatever extends Component<Props, State> {
...
}
My tsconfig.json file contains this line allowing synthetic defaults:
"allowSyntheticDefaultImports": true
My webpack.config.js file:
let path = require("path");
let config = {
entry: "./src/main.tsx",
output: {
path: path.resolve(__dirname, "build"),
filename: "bundle.js"
},
devtool: "source-map",
resolve: {
extensions: [".ts", ".tsx", ".js", ".jsx"]
},
module: {
loaders: [
{
test: /\.tsx?$/,
loader: "ts-loader",
exclude: /node_modules/
}
]
}
};
module.exports = config;
Not sure what I'm missing here....
Set "esModuleInterop": true instead.
In your typescript configuration i.e tsconfig.json "esModuleInterop": true and "allowSyntheticDefaultImports": true. this will allow you to import CommonJS modules in compliance with es6 modules spec.
Module resolution is a little complicated because Typescript does it different than Babel and Webpack. If you want to know more you can check this comment: https://github.com/Microsoft/TypeScript/issues/5565#issuecomment-155216760
Going back to your problem, allowSyntheticDefaultImports tells Typescript to allow default imports from modules with no default export but the emitted code doesn't change. Because of that, you need to move the responsibility of resolving modules to Webpack or Babel.
To achieve that set moduleResolution module to ES6es2015 in the Typescript config file.
The pipeline will look like this:
TS Code => (TypescriptCompiler) => JS Code with ES6 modules => (Webpack modules resolver) => JS Code
I'm trying to setup Hot Module Reloading with Webpack 2 and Preact. It's "working", in that it's reloading the entire contents of the app every reload, but I'm getting errors between hot reloads (and I think that's why individual components aren't the only thing reloading).
Here's the relevant parts of my webpack setup:
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.NoEmitOnErrorsPlugin(),
new webpack.NamedModulesPlugin(),
//etc.
],
entry: [
'webpack-dev-server/client?'+DEV_SERVER,
'webpack/hot/only-dev-server',
'./dev/jsx/index.jsx'
],
devServer: {
hot: true,
inline: true,
contentBase: path.join(__dirname, '/'),
publicPath: '/'
}
My index.jsx file looks like:
import React from 'react';
import ReactDOM from 'react-dom';
import App from './AppProvider.jsx';
const renderApp = () => {
ReactDOM.render(<App/>, document.getElementById('root'));
};
renderApp();
if (module.hot) {
module.hot.accept();
module.hot.accept('./AppProvider.jsx', renderApp);
}
When I make a change in any of the project files, the app contents reload and I get the following errors:
Have any of you gotten this before? I've been Googling all day and haven't found anything...
You're rendering the old AppProvider module, which is null when HMR kicks in. You'll need to move the require()/import for AppProvider.jsx into your HMR handler as shown here.
import React from 'react';
import ReactDOM from 'react-dom';
const renderApp = () => {
let App = require('./AppProvider.jsx');
App = App.default || App; // if you're using ES Modules
ReactDOM.render(<App/>, document.getElementById('root'));
};
renderApp();
if (module.hot) {
module.hot.accept('./AppProvider.jsx', renderApp);
}