Is there a way to fix this Server Side Rendering Error - javascript

I want to set up Server Side Rendering for my react project. This error has stumped me for some time now and the research that I have used has not worked.
I just want to use Server Side Rendering to Render a Component In my project.
*ERROR in ./server.js Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Plugin/Preset files are not allowed to export objects, only functions. In C:\Users\Alex
Green\Desktop\react_project\node_modules\babel-preset-react\lib\index.js*
Here is my server.js file:
import 'babel-polyfill';
import express from 'express';
import React from 'react';
import ReactDOMServer from 'react-dom/server';
import { StaticRouter } from 'react-router';
import bodyParser from 'body-parser';
import App from './src/app';
const app = express();
const PORT = process.env.PORT || 3000;
app.use(bodyParser.json());
app.use(express.static('build'));
app.get('*', (req, res) => {
const context = {};
const content = ReactDOMServer.renderToString(
<StaticRouter location={req.url} context={context}>
<App />
</StaticRouter>
);
const html = ` <html>
<head>
</head>
<body>
<div id="root">
${content}
</div>
</body>
</html>`;
res.send(html)
})
app.listen(PORT, () => {
console.log(`Server is Running ${PORT}`);
});
Here is the webpack.server.js file:
const path = require('path');
const webpackNodeExternals = require('webpack-node-externals');
module.exports = {
target: 'node',
entry: "./server.js",
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, 'build'),
publicPath: '/build'
},
module: {
rules: [
{
test: /\.js$/,
loader: 'babel-loader',
exclude: '/node_modules/',
options: {
presets: [
'react',
'stage-0',
['env', {
target: {
browsers: ['last 2 versions']
}
}]
]
}
}
]
},
externals: [webpackNodeExternals()]
}
and my package.json file:
{
"name": "react_project",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"webpack:server": "webpack --config webpack.server.js --watch"
},
"dependencies": {
"#babel/core": "^7.12.10",
"#babel/plugin-proposal-class-properties": "^7.12.1",
"#babel/plugin-transform-runtime": "^7.12.10",
"#babel/preset-env": "^7.12.11",
"#babel/preset-react": "^7.12.10",
"babel-cli": "^6.26.0",
"babel-core": "^6.26.3",
"babel-loader": "^8.2.2",
"babel-polyfill": "^6.26.0",
"babel-preset-env": "^1.7.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-es2017": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-0": "^6.24.1",
"body-parser": "^1.19.0",
"express": "^4.17.1",
"react": "^17.0.1",
"react-dom": "^17.0.1",
"react-router": "^5.2.0",
"react-router-dom": "^5.2.0",
"webpack": "^5.11.0",
"webpack-cli": "^4.2.0",
"webpack-node-externals": "^2.5.2"
},
"presets": [
"#babel/preset-env",
"#babel/preset-react"
]
}
The way I run the project is: yarn run webpack:server (inside the package.json file) in the console
Thanks for the help :)

Related

How do you upgrade webpack-dev-server from v3 to v4?

I have been struggling with an issue with hot reloading where making edits in certain files would reload the app without those changes.
My initial solution was to update webpack and related modules. The first module I updated was webpack-dev-server. I went from v3 to v4 which immediately broke the app. All images and json files were getting 404'd when running the dev server.
Here is the original package.json:
{
...
"scripts": {
"dev": "set NODE_ENV=development && webpack serve --config config/webpack.dev.js --open",
"build": "set NODE_ENV=production && webpack --config config/webpack.prod.js",
"beatmarkers": "babel-node fetchAndFormatData/fetchAndFormatBeatMarkers.js"
},
"devDependencies": {
"#babel/cli": "^7.14.3",
"#babel/core": "^7.14.3",
"#babel/node": "^7.14.2",
"#babel/preset-env": "^7.14.4",
"clean-webpack-plugin": "^4.0.0-alpha.0",
"css-loader": "^5.2.6",
"file-loader": "^6.2.0",
"html-webpack-plugin": "^5.3.1",
"lodash.clonedeep": "^4.5.0",
"node-fetch": "^2.6.1",
"node-sass": "^6.0.0",
"sass-loader": "^11.1.1",
"style-loader": "^2.0.0",
"webpack": "^5.38.1",
"webpack-cli": "^4.7.0",
"webpack-dev-server": "^3.11.2",
"webpack-merge": "^5.7.3"
},
"dependencies": {
"bezier-easing": "^2.1.0",
"howler": "^2.2.3",
"pixi.js": "^6.2.0"
}
}
Here are the original webpack config files:
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: './src/app.js',
plugins: [
new HtmlWebpackPlugin({
template: path.resolve(__dirname, '../src/template.html')
})
],
module: {
rules: [
{
test: /\.(png|jpe?g|gif|svg|ico|pvr|mp3|fnt)$/,
type: 'asset/resource'
},
{
test: /\.scss$/,
use: ['style-loader', 'css-loader', 'sass-loader']
}
]
}
};
const { merge } = require('webpack-merge');
const common = require('./webpack.common');
module.exports = merge(common, {
mode: 'development',
devServer: {
historyApiFallback: true,
},
output: {
publicPath: '/'
},
devtool: "source-map"
});
This configuration produces a sources structure in chrome that looks like this:
localhost:8080
main.js
(index)
assets/images
animations
fonts
interface
When I updated webpack-dev-server to the latest version, 4.11.1, the assets/images folder no longer exists. I haven't be able to figure out how to get it back. Any help would be deeply appreciated.

Callback of onMounted is not being triggered in vue 3 plugin that bundled by webpack

Forgive me for getting long content to explain my problem.
I made a simple npm vue3-helloword-webpack plugin. This plugin consoles the simple text from inside the onMounted method.
If I bundle this helloworld plugin using vue-cli tool, the callback of onMounted from plugin would be triggered. But same does not happen while bundling by webpack.
I think the problem is occurred because of currenIntance(I guess it’s a vue instance) is null as shown in below image.
Content: when the plugin is bundled by webpack
Webpack.config.babel.js
const TerserPlugin = require("terser-webpack-plugin")
const libraryNamePlugin = 'vue3-helloworld-webpack';
const appConfig = {
entry: {
'vue3-helloworld-webpack': __dirname + '/src/index.js',
'vue3-helloworld-webpack.min': __dirname + '/src/index.js'
},
devtool: 'source-map',
output: {
path: __dirname + '/dist',
filename: '[name].js',
library: libraryNamePlugin,
libraryTarget: 'umd'
},
module: {
rules: [
{
test: /(\.jsx|\.js)$/,
loader: 'babel-loader',
exclude: /(node_modules|bower_components)/
},
{
test: /(\.jsx|\.js)$/,
loader: 'eslint-loader',
exclude: /node_modules/
}
]
},
optimization: {
minimize: true,
minimizer: [
new TerserPlugin({
include: 'vue3-helloworld-webpack.min.js',
}),
],
},
};
module.exports = [appConfig];
package.json
....
"main": "dist/vue3-helloworld-webpack.js",
"scripts": {
"build": "webpack --config webpack.config.babel.js"
},
"dependencies": {
"core-js": "^3.6.5"
},
"devDependencies": {
"#babel/core": "^7.14.3",
"#babel/preset-env": "^7.14.4",
"#babel/register": "^7.13.16",
"babel-eslint": "^10.1.0",
"babel-loader": "^8.2.2",
"babel-plugin-add-module-exports": "^1.0.4",
"babel-preset-es2015": "^6.24.1",
"chai": "^4.3.4",
"eslint": "^7.27.0",
"eslint-loader": "^4.0.2",
"lodash": "^4.17.21",
"mocha": "^8.4.0",
"terser-webpack-plugin": "^5.1.3",
"vue": "^3.0.0",
"webpack": "^5.38.1",
"webpack-cli": "^4.7.0",
"webpack-dev-server": "^3.11.2",
"yards": "^0.1.4"
}
....
vue3-helloworld-webpack.js
import {onMounted, h} from 'vue'
const config = { msg: String }
export default {
name: 'vue3-helloworld-webpack',
props : config,
setup(props) {
console.log("setup() is invoked")
console.log(props.msg);
onMounted(function () {
console.log("Hooray!!! Onmounted() is triggered")
});
},
render() {
return h('div', {
id: 'helloworld-1'
});
}
}
src/index.js
import vue3helloworldwebpack from './vue3-helloworld-vuewebpack';
const install = (app) => {
app.component(vue3helloworldwebpack.name, vue3helloworldwebpack);
};
export default install;
Result: when the plugin is used by other very simple vue app
Content when the plugin bundled by Vue-cli
package.json
....
"main": "dist/vue3-helloworld-vuecli.umd.js",
"scripts": {
"build": "vue-cli-service build --formats umd --target lib ./src/index.js"
},
"dependencies": {
"core-js": "^3.6.5"
},
"devDependencies": {
"#vue/cli-plugin-babel": "^4.5.6",
"#vue/cli-plugin-eslint": "^4.5.6",
"#vue/cli-plugin-unit-jest": "^4.5.6",
"#vue/cli-service": "^4.5.6",
"#vue/compiler-sfc": "^3.0.0-rc.10",
"#vue/test-utils": "^2.0.0-beta.5",
"babel-eslint": "^10.1.0",
"babel-jest": "^26.3.0",
"eslint": "^7.9.0",
"eslint-config-prettier": "^8.1.0",
"eslint-plugin-prettier": "^3.1.4",
"eslint-plugin-vue": "^7.0.0-0",
"husky": "^6.0.0",
"prettier": "^2.1.1",
"typescript": "^4.0.2",
"vue": "^3.0.0",
"vue-jest": "^5.0.0-alpha.4"
}
....
Other codes are similar to webpack version except name and webpack config file.
Result
The other simple vue3 app which is using the created plugin(vue3-helloworld-webpack)
Main.js
import { createApp } from 'vue'
import App from './App.vue'
import Vue3HelloworldWebpack from 'vue3-helloworld-webpack'
createApp(App).use(Vue3HelloworldWebpack).mount('#app')
App.vue
<template> <vue3-helloworld-webpack msg="Welcome!!!!" /></template>
We can get created plugins: webpack and vue-cli versions on GitHub.
My question
Vue cli version does work. One interesting thing, the same webpack file configuration is working for vue2 plugin also.
But it does not work for vue 3 plugin, How can I do this without using vue-cli but using webpack version ?

webpack failed to start react project

I am learning to use webpack to develop a react project, but I cannot start local services locally. It reports the following error.
ERROR in ./src/index.js 5:16
Module parse failed: Unexpected token (5:16)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
| import App from './App';
|
> ReactDOM.render(<App />, document.getElementById('root'));
|
I suspect this is a babel compilation problem, but I have configured babel-loader, but it does not work. I Googled this issue for a long time, but I still didn't find the problem. Can you help me? Thanks!
And this is my configuration files.
// webpack.common.js
const path = require('path');
const commonConfig = {
entry: [
'babel-polyfill',
'../src/index.js'
],
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js'
},
plugins: [
new HtmlWebpackPlugin({
template: path.resolve(__dirname, 'dist/index.html')
})
],
module: {
rules: [{
test: /\.(jsx?|tsx?)$/,
loader: 'babel-loader',
exclude: /node_modules/,
}]
}
};
module.exports = commonConfig;
// webpack.dev.js
const merge = require('webpack-merge');
const commonConfig = require('./webpack.common.js');
const path = require('path');
const devConfig = merge(commonConfig, {
mode: 'development',
devServer: {
contentBase: path.join(__dirname, 'dist'),
compress: true,
port: 3000
}
})
module.exports = devConfig;
// package.json
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "webpack-dev-server",
},
"devDependencies": {
"#babel/core": "^7.11.4",
"#babel/preset-env": "^7.11.0",
"#babel/preset-react": "^7.10.4",
"babel-core": "^6.26.3",
"babel-loader": "^8.1.0",
"babel-polyfill": "^6.26.0",
"babel-preset-env": "^1.7.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"html-webpack-plugin": "^4.3.0",
"webpack": "^4.44.1",
"webpack-cli": "^3.3.12",
"webpack-dev-server": "^3.11.0"
},
"dependencies": {
"react": "^16.13.1",
"react-dom": "^16.13.1"
// .babelrc
{
"presets": ["env", "react"]
}
I found out where the problem was. I didn’t specify the webpack.dev.js file for the npm run start command in the scripts of package.json, and it worked after making the following changes.
"scripts": {
"start": "webpack-dev-server --config webpack/webpack.dev.js",
},

SyntaxError: Import React from 'react' Unexpected identifier

I'm trying to run my server.js file locally but every time I try "node server.js" I get a:
SyntaxError: Unexpected Identifier for "import React from react
I'm simply trying to see if I get a console.log("connected") message in a function that accesses my database.
I have already tried adding the "transform-es2015-modules-amd" to my plugins in the package.json file in the Babel section. I have tried almost every other solution offered on Stack Overflow posts similar to mine.
package.json
{
"dependencies": {
"atob": "^2.1.2",
"axios": "^0.19.0",
"babel-loader": "^8.0.0-beta.6",
"babel-upgrade": "^1.0.1",
"btoa": "^1.2.1",
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"cors": "^2.8.5",
"express": "^4.17.1",
"mysql": "^2.17.1",
"node-fetch": "^2.6.0",
"react": "^16.11.0",
"react-dom": "^16.11.0",
"react-redux": "^7.1.1",
"react-router": "^5.1.2",
"react-router-dom": "^5.1.2",
"redux": "^4.0.4",
"request": "^2.88.0",
"serialize-javascript": "^2.1.0"
},
"devDependencies": {
"#babel/cli": "^7.6.4",
"#babel/core": "^7.6.4",
"#babel/node": "^7.6.3",
"#babel/preset-env": "^7.6.3",
"#babel/preset-react": "^7.6.3",
"#types/node": "^12.11.2",
"babel-loader": "^8.0.6",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"css-loader": "^3.2.0",
"nodemon": "^1.19.4",
"style-loader": "^1.0.0",
"webpack": "^4.41.2",
"webpack-cli": "^3.3.9",
"webpack-dev-server": "^3.9.0",
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},
"babel": {
"presets": [
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"#babel/preset-env"
]
"plugins": [
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]
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server.js
import React from 'react';
import { StaticRouter } from 'react-router-dom';
import { Provider as ReduxProvider } from "react-redux";
import App from '../client/src/App.js';
import { renderToString } from "react-dom/server";
import createStore, { initialize, fetchCharacters } from './store.js';
var path = require("path");
var express = require("express");
var serialize = require("serialize-javascript");
var db = require('./db');
const PORT = process.env.HTTP_PORT || 4001;
const app = express();
app.use('/static', express.static(path.join(__dirname, 'public')));
console.log(__dirname);
app.get('/*', function(req, res) {
const context = {};
const store = createStore();
store.dispatch(initialize());
Promise.all([store.dispatch(fetchCharacters())]).then(() => {
const component = (
<ReduxProvider store={store}>
<StaticRouter location={req.url} context={context}>
<App/>
</StaticRouter>
</ReduxProvider>
);
const ss_react = renderToString(component);
const ss_state = store.getState();
res.writeHead( 200, { "Content-Type": "text/html" });
res.end(htmlTemplate(component, ss_state));
});
});
function htmlTemplate(component, ss_state) {
return `
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>React SSR</title>
</head>
`;
}
app.listen(PORT, () => {
console.log(`server listening at port ${PORT}. `);
});
webpack.config.js
const webpack = require('webpack')
const nodeExternals = require('webpack-node-externals')
const path = require('path')
const js = {
test: /\.m?(js|jsx)$/,
exclude: /(node_modules|bower_components)/,
use: {
loader: 'babel-loader'
}
}
const css = {
test: /\.css$/,
use: [
"style-loader",
{
loader: "css-loader",
options: {
modules: true
}
}
]
}
const serverConfig = {
mode: 'development',
target: 'node',
node: {
__dirname: false
},
externals: [nodeExternals()],
entry: {
'index.js': path.resolve(__dirname, 'server/server.js')
},
module: {
rules: [js]
},
output: {
path: path.resolve(__dirname, 'dist'),
filename: '[name]'
}
}
const clientConfig = {
mode: 'development',
target: 'web',
entry: {
'index.js': path.resolve(__dirname, 'client/src/index.js')
},
module: {
rules: [js, css]
},
optimization: {
splitChunks: {
chunks: 'all'
}
},
output: {
path: path.resolve(__dirname, 'dist/public'),
filename: '[name]'
}
}
module.exports = [serverConfig, clientConfig]
Node does not understand React JSX. That's what Webpack is for - it uses Babel to transpile your code into vanilla JavaScript.
Looks like you have webpack-dev-server as a dev dependency, so it should already be installed (if you've done an npm install). Make sure you have something like this in your package.json scripts field:
"scripts": {
"start:dev": "webpack-dev-server --config webpack.config.js"
},
Then run npm run start:dev in your console.

Webpack 2: Cannot read property 'Base64' of undefined

I'm new to Webpack. My React config works, but when I try to import postcssJs from 'postcss-js' the browser throws an Uncaught TypeError: Cannot read property 'Base64' of undefined in the bundle on var _Base64 = global.Base64;.
Here is my webpack config:
module.exports = {
entry: './demo/js/components/App.js',
output: {
path: __dirname + '/demo/js',
filename: 'bundle.js'
},
module: {
loaders: [
{
test: /\.(js|jsx)$/,
loader: 'babel',
query: {
presets: [
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'stage-0',
'react'
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}
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},
node: {
fs: 'empty'
},
watch: true
}
Here is the React file I'm having problems with:
import React from 'react'
import postcssJs from 'postcss-js' // When I comment out this line, everything works fine.
export default ({greeting}) => <h3>{greeting}</h3>
I'm sure I'm just missing some basic Webpack paradigm about using some sort of loader or something, but I can't figure it out.
I'd really appreciate any help as this has been blocking me for several hours now...
Here are my dependencies:
"dependencies": {
"chalk": "^1.1.3",
"postcss": "^5.2.5",
"postcss-value-parser": "^3.3.0"
},
"devDependencies": {
"babel-cli": "^6.18.0",
"babel-loader": "^6.2.5",
"babel-plugin-add-module-exports": "^0.2.1",
"babel-plugin-transform-flow-strip-types": "^6.18.0",
"babel-plugin-transform-react-stateless-component-name": "^1.0.1",
"babel-preset-es2015": "^6.18.0",
"babel-preset-react": "^6.16.0",
"babel-preset-stage-0": "^6.16.0",
"browser-sync": "^2.17.5",
"imports-loader": "^0.6.5",
"lodash": "^4.16.4",
"npm-run-all": "^3.1.1",
"postcss-js": "^0.1.3",
"react": "^15.4.0-rc.4",
"react-dom": "^15.4.0-rc.4",
"stylus": "^0.54.5",
"webpack": "^2.1.0-beta.25"
}
It works without Babel, but I need Babel...

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