Develop Reference

JSX causing Errors with Jest and Enzyme

When I run the code below I get a repeated error trying to use enzyme with jest on the first JSX component <. So far, I haven't been able to find anything on this occurring with React and not React-Native. So I have followed many tutorials I have found, listened to all the advice, but to no avail.
What could the problem be? Sorry for so much code, but it is all needed for context.
Dependencies:
"dependencies": {
"#babel/core": "^7.8.3",
"#babel/plugin-proposal-class-properties": "^7.8.3",
"#babel/preset-env": "^7.8.3",
"#babel/preset-react": "^7.8.3",
"autoprefixer": "^9.7.4",
"babel-jest": "^25.1.0",
"babel-loader": "^8.0.6",
"css-loader": "^3.4.2",
"enzyme": "^3.11.0",
"enzyme-adapter-react-16": "^1.15.2",
"eslint": "^6.8.0",
"eslint-config-jest-enzyme": "^7.1.2",
"eslint-plugin-jest": "^23.7.0",
"jest": "^25.1.0",
"mini-css-extract-plugin": "^0.9.0",
"moment": "^2.24.0",
"postcss-loader": "^3.0.0",
"postcss-nested": "^4.2.1",
"puppeteer": "^2.1.1",
"react": "^16.12.0",
"react-dom": "^16.12.0",
"react-highlighter": "^0.4.3",
"react-redux": "^7.1.3",
"react-router-dom": "^5.1.2",
"react-test-renderer": "^16.12.0",
"redux": "^4.0.5",
"style-loader": "^1.1.3",
"tailwindcss": "^1.1.4",
"webpack": "^4.41.5",
"webpack-cli": "^3.3.10"
},
"devDependencies": {
"babel-eslint": "^10.0.3",
"eslint": "^6.1.0",
"eslint-config-airbnb": "^18.0.1",
"eslint-loader": "^3.0.3",
"eslint-plugin-import": "^2.20.0",
"eslint-plugin-jsx-a11y": "^6.2.3",
"eslint-plugin-react": "^7.18.0",
"eslint-plugin-react-hooks": "^1.7.0",
"webpack-dev-server": "^3.10.1",
"write-file-webpack-plugin": "^4.5.1"
}
Test:
{
import React from 'react';
import Enzyme, { shallow, mount } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';
import Button from '../src/components/utility/Button';
Enzyme.configure({ adapter: new Adapter() });
describe('<Button /> Testing', () => {
it('renders Button without crashing', () => shallow(<Button />));
});
}
webpack.config.js:
const path = require('path');
const { HotModuleReplacementPlugin } = require('webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const WriteFilePlugin = require('write-file-webpack-plugin');
module.exports = (env, argv) => ({
entry: ['#babel/polyfill', path.join(__dirname, 'src', 'index.js')],
plugins: [
new MiniCssExtractPlugin({
filename: '[name].bundle.css',
chunkFilename: '[id].css',
}),
new WriteFilePlugin({
// Write only files that have ".css" extension.
test: /\.css$/,
useHashIndex: true,
}),
new HotModuleReplacementPlugin(),
],
devServer: {
open: true,
clientLogLevel: 'silent',
contentBase: './dist',
historyApiFallback: true,
hot: true,
},
module: {
rules: [
{
test: /\.(jsx|js)$/,
include: path.resolve(__dirname, 'src'),
exclude: /node_modules/,
use: [{
loader: 'babel-loader',
options: {
presets: [
['#babel/preset-env', {
targets: {
node: '10',
},
}],
'#babel/preset-react',
],
plugins: ['#babel/plugin-proposal-class-properties'],
},
}, {
loader: 'eslint-loader',
options: {
fix: true,
},
}],
},
{
test: /\.css$/i,
include: path.resolve(__dirname, 'src'),
exclude: /node_modules/,
use: [
'style-loader',
{
loader: MiniCssExtractPlugin.loader,
options: {
hmr: argv.mode === 'development',
},
},
{
loader: 'css-loader',
options: {
importLoaders: 1,
},
},
'postcss-loader',
],
},
],
},
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js',
},
});

I ended up figuring out what the issue was. We didn't have our babel setup in a way that Enzyme would use it. This can be done through a .babelrc file which in hindsight is probably better to use. At present I resolved it by adding configuration for babel into the package.json. I'm sure there's a better way to do this, probably with a .babelrc since Enzyme looks for that by default from what I could find.
"babel": {
"presets": [
"#babel/preset-env",
"#babel/preset-react"
],
"plugins": [
"#babel/plugin-proposal-class-properties",
"#babel/plugin-transform-runtime"
]
},

Javascript es6 class is not defined

After building my project it gives me this error but in the console of chrome it gives me the following error. Could someone help me? I have no idea what causes this. It feels like im using export and class in a wrong way.
Node version: v11.6.0
Npm version: 4.6.1
webpack.config.js
const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const StyleLintPlugin = require('stylelint-webpack-plugin');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const autoprefixer = require('autoprefixer');
const webpack = require('webpack');
module.exports = {
entry:
{
widget: ['./src/js/widget/v1/widget.js', './src/sass/widget/widget.scss'],
website: ['./src/sass/website/website.scss', './src/js/website/website.js']
},
output: {
path: path.resolve(__dirname, 'static'),
filename: '[name]/[name].js',
},
module: {
loaders: [
{
test: /\.js$/,
exclude: /node_modules/,
enforce: 'pre',
},
{
test: /\.js$/,
loader: 'babel-loader',
query: {
presets: ['es2015'],
},
},
{
test: /\.(css|scss)$/,
loaders: ExtractTextPlugin.extract({
fallback: 'style-loader',
use: ['css-loader?minimize!sass-loader'],
}),
},
{
test: /\.(scss)$/,
loader: "sass-loader", // compiles Sass to CSS
options: {
data: "$HOST-URL: '" + "localhost:8000" + "';"
}
},
{ test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: 'file-loader?mimetype=image/svg+xml' },
{ test: /\.woff(\?v=\d+\.\d+\.\d+)?$/, loader: 'file-loader?mimetype=application/font-woff' },
{ test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/, loader: 'file-loader?mimetype=application/font-woff' },
{ test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: 'file-loader?mimetype=application/octet-stream' },
{ test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: 'file-loader' },
],
},
stats: {
colors: true,
},
devtool: 'source-map',
plugins: [
new webpack.DefinePlugin({
HOST_URL: "localhost:8000"
}),
new CopyWebpackPlugin([
{ from: './node_modules/font-awesome/fonts/', to: './assets/fonts/' },
{ from: './src/widget/', to: './widget/' },
{ from: './src/website/', to: './website/' },
]),
new StyleLintPlugin(),
new ExtractTextPlugin({
filename: '[name]/css/[name].css',
allChunks: true,
}),
new UglifyJSPlugin(),
],
};
package.json
{
"name": "name",
"version": "0.0.1",
"main": "index.js",
"author": "author",
"license": "MIT",
"devDependencies": {
"autoprefixer": "^6.7.7",
"babel-core": "^6.26.3",
"babel-eslint": "^7.1.1",
"babel-loader": "^6.4.0",
"babel-preset-es2015": "^6.22.0",
"css-loader": "^0.26.4",
"eslint": "^3.17.1",
"eslint-config-airbnb": "^14.1.0",
"eslint-loader": "^1.6.3",
"eslint-plugin-import": "^2.2.0",
"eslint-plugin-jsx-a11y": "^4.0.0",
"eslint-plugin-react": "^6.10.0",
"file-loader": "^0.10.1",
"http-server": "^0.11.1",
"node-sass": "^4.9.2",
"postcss-loader": "^1.3.3",
"sass-loader": "^6.0.3",
"style-loader": "^0.13.2",
"stylelint-config-standard": "^16.0.0",
"stylelint-webpack-plugin": "^0.7.0",
"uglifyjs-webpack-plugin": "^0.3.0",
"webpack": "^2.7.0",
"webpack-shell-plugin": "^0.5.0"
},
"scripts": {
"babel": "babel --presets es2015 js/main.js -o build/main.bundle.js",
"webpack": "webpack",
"watch": "webpack --watch"
},
"dependencies": {
"bootstrap": "^4.0.0",
"bootstrap-datepicker": "^1.6.4",
"bootstrap-sass": "^3.3.7",
"copy-webpack-plugin": "^4.5.2",
"extract-text-webpack-plugin": "^2.1.0",
"font-awesome": "^4.7.0",
"formdata-polyfill": "^3.0.9",
"jquery": "^3.2.1",
"popper.js": "^1.12.9"
}
}
widget.js
import Video from './video';
import Overlay from './overlay';
class Widget {
...
}
export {Widget as default}
window.Widget = Widget;
Video and Overlay are also classes and exported the same way as the Widget class. Before this, it was declares as
export default class Widget{}
The code where I am trying to access Widget is in the index.html, where I create a new Widget inside the script tag.
index.html
<script type="text/javascript">
var widget = new Widget({
});
widget.render();
</script>

ERROR in ./node_modules/bootstrap-loader/no-op.js

I'm using Webpack in my application, in which I create my entry point as
index.ts and I'm trying to run it using sass css bootstrap typescript as resources in my project webpack, but I am stuck with these errors,(bootstrap-loader) :
ERROR in ./node_modules/bootstrap-loader/no-op.js
(./node_modules/bootstrap-loader/lib/bootstrap.scripts.loader.js?{"bootstrapVersion":3,"useCustomIconFontPath":false,"extractStyles":false,"styleLoaders":["style-loader","css-loader","sass-loader"],"styles":["mixins","normalize","print","glyphicons","s
caffolding","type","code","grid","tables","forms","buttons","component-animations","dropdowns","button-groups","input-groups","navs","navbar","breadcrumbs","pagination","pager","labels","badges","jumbotron","thumbnails","alerts","progress-bars","media","list-group","panels","wells","responsive-embed","close","modals","tooltip","popovers","carousel","utilities","responsive-utilities"],"scripts":["transition","alert","button","carousel","collapse","dropdown","modal","tooltip","popover","scrollspy","tab","affix"],"configFilePath":"/projects/bootstrapwebpack/node_modules/bootstrap-loader/.bootstraprc-3-default","bootstrapPath":"/projects/bootstrapwebpack/node_modules/bootstrap-sass","bootstrapRelPath":"../bootstrap-sass"}!./node_modules/bootstrap-loader/no-op.js)
...
In my config.js I have :
const path = require('path');
const webpack = require('webpack');
module.exports = {
entry: [ 'bootstrap-loader', './src/index.ts',],
module: {
rules:[
{
test: /\.css$/,
use: [
'style-loader',
'css-loader'
],
},
{
test: /\.js$/,
exclude: /(node_modules|bower_components)/,
use: {
loader: 'babel-loader',
options: {
presets: ['env']
}
}
},
{
test: /\.(gif|png|jpe?g|svg)$/i,
use: [
'file-loader',
{
loader: 'image-webpack-loader',
options: {
},
},
],
},
{
test: /\.tsx?$/,
use: 'ts-loader',
exclude: /node_modules/
},
{
test: /\.scss$/,
use: ['style-loader', 'css-loader', 'sass-loader'],
exclude: /node_modules/
},
// Boooootstrap
{
test: /bootstrap-sass\/assets\/javascripts\//,
loader: 'imports-loader?jQuery=jquery'
},
{
test: /\.(woff2?|svg)$/, loader: 'url-loader?limit=10000'
},
{
test: /\.(ttf|eot)$/, loader: 'file-loader'
},
],
},
output: {
filename: 'main.js',
path: path.resolve(__dirname, 'dist')
}
};
Currently I'm trying to use in my package.json these following lines :
{
"name": "test",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"dev": "webpack --mode development --watch ",
"build": "webpack --progress -p --watch "
},
"dependencies": {
"autoprefixer": "^9.0.0",
"babel-core": "^6.26.3",
"babel-loader": "^7.1.5",
"babel-preset-env": "^1.7.0",
"bootstrap": "^4.1.2",
"bootstrap-loader": "^3.0.0",
"bootstrap-sass": "^3.3.7",
"css-loader": "^1.0.0",
"exports-loader": "^0.7.0",
"file-loader": "^1.1.11",
"image-webpack-loader": "^4.3.1",
"jquery": "^3.3.1",
"mini-css-extract-plugin": "^0.4.1",
"node-sass": "^4.9.2",
"popper.js": "^1.14.3",
"postcss-loader": "^2.1.6",
"resolve-url-loader": "^2.3.0",
"sass-loader": "^7.0.3",
"style-loader": "^0.21.0",
"ts-loader": "^4.4.2",
"typescript": "^2.9.2",
"url-loader": "^1.0.1",
"webpack": "^4.16.0",
"webpack-cli": "^3.0.8"
}
}

I had the same problem yesterday.
Try adding in ./src/index.ts
require 'bootstrap/dist/css/bootstrap.min.css';
require 'bootstrap/dist/js/bootstrap.min.js';

3rd party Javascript and CSS files in Webpack. Strange behaviour

I am using the MERN stack. I had to use a 3rd party html admin template which has a lot of standard js and css files (jquery, bootstrap, datatables etc.). To integrate it with react, I created a "public" folder in the root directory of my project. I then configured Express to serve this folder as a static folder and placed the required css and html files inside this folder. To use them, I added the css in the head section of the index.html file and the js in the end of the body. It works when I run the server in development mode and there are no issues. When I run it in production mode, somehow the layout gets messed up. If I refresh it with CTRL + F5 it gets fixed but when I navigate to a new page it gets ruined again and I have to CTRL + F5 it again to display properly.
This is my webpack.config.dev.js
var webpack = require('webpack');
var cssnext = require('postcss-cssnext');
var postcssFocus = require('postcss-focus');
var postcssReporter = require('postcss-reporter');
module.exports = {
devtool: 'cheap-module-eval-source-map',
entry: {
app: [
'eventsource-polyfill',
'webpack-hot-middleware/client',
'webpack/hot/only-dev-server',
'react-hot-loader/patch',
'./client/index.js',
],
vendor: [
'react',
'react-dom',
],
},
output: {
path: __dirname,
filename: 'app.js',
publicPath: 'http://0.0.0.0:8000/',
},
resolve: {
extensions: ['', '.js', '.jsx'],
modules: [
'client',
'node_modules',
],
},
module: {
loaders: [
{
test: /\.css$/,
exclude: /node_modules/,
loader: 'style-loader!css-loader?localIdentName=[name]__[local]__[hash:base64:5]&modules&importLoaders=1&sourceMap!postcss-loader',
}, {
test: /\.css$/,
include: /node_modules/,
loaders: ['style-loader', 'css-loader'],
}, {
test: /\.jsx*$/,
exclude: [/node_modules/, /.+\.config.js/],
loader: 'babel',
}, {
test: /\.(jpe?g|gif|png|svg)$/i,
loader: 'url-loader?limit=10000',
}, {
test: /\.json$/,
loader: 'json-loader',
},
],
},
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.optimize.CommonsChunkPlugin({
name: 'vendor',
minChunks: Infinity,
filename: 'vendor.js',
}),
new webpack.DefinePlugin({
'process.env': {
CLIENT: JSON.stringify(true),
'NODE_ENV': JSON.stringify('development'),
}
}),
],
postcss: () => [
postcssFocus(),
cssnext({
browsers: ['last 2 versions', 'IE > 10'],
}),
postcssReporter({
clearMessages: true,
}),
],
};
This is my webpack.config.prod.js
var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var ManifestPlugin = require('webpack-manifest-plugin');
var ChunkManifestPlugin = require('chunk-manifest-webpack-plugin');
var cssnext = require('postcss-cssnext');
var postcssFocus = require('postcss-focus');
var postcssReporter = require('postcss-reporter');
var cssnano = require('cssnano');
module.exports = {
devtool: 'hidden-source-map',
entry: {
app: [
'./client/index.js',
],
vendor: [
'react',
'react-dom',
]
},
output: {
path: __dirname + '/dist/client/',
filename: '[name].[chunkhash].js',
publicPath: '/',
},
resolve: {
extensions: ['', '.js', '.jsx'],
modules: [
'client',
'node_modules',
],
},
module: {
loaders: [
{
test: /\.css$/,
exclude: /node_modules/,
loader: ExtractTextPlugin.extract('style-loader', 'css-loader?localIdentName=[hash:base64]&modules&importLoaders=1!postcss-loader'),
}, {
test: /\.css$/,
include: /node_modules/,
loaders: ['style-loader', 'css-loader'],
}, {
test: /\.jsx*$/,
exclude: /node_modules/,
loader: 'babel',
}, {
test: /\.(jpe?g|gif|png|svg)$/i,
loader: 'url-loader?limit=10000',
}, {
test: /\.json$/,
loader: 'json-loader',
},
],
},
plugins: [
new webpack.DefinePlugin({
'process.env': {
'NODE_ENV': JSON.stringify('production'),
}
}),
new webpack.optimize.CommonsChunkPlugin({
name: 'vendor',
minChunks: Infinity,
filename: 'vendor.js',
}),
new ExtractTextPlugin('app.[chunkhash].css', { allChunks: true }),
new ManifestPlugin({
basePath: '/',
}),
new ChunkManifestPlugin({
filename: "chunk-manifest.json",
manifestVariable: "webpackManifest",
}),
new webpack.optimize.UglifyJsPlugin({
compressor: {
warnings: false,
}
}),
],
postcss: () => [
postcssFocus(),
cssnext({
browsers: ['last 2 versions', 'IE > 10'],
}),
cssnano({
autoprefixer: false
}),
postcssReporter({
clearMessages: true,
}),
],
};
Package.json
{
"name": "",
"version": "2.0.0",
"description": "",
"scripts": {
"test": "cross-env NODE_ENV=test PORT=8080 MONGO_URL=mongodb://localhost:27017/mern-test node_modules/.bin/nyc node --harmony-proxies node_modules/.bin/ava",
"watch:test": "npm run test -- --watch",
"cover": "nyc npm run test",
"check-coverage": "nyc check-coverage --statements 100 --branches 100 --functions 100 --lines 100",
"start": "cross-env BABEL_DISABLE_CACHE=1 NODE_ENV=development nodemon index.js",
"start:prod": "cross-env NODE_ENV=production node index.js",
"bs": "npm run clean && npm run build && npm run build:server && npm run start:prod",
"build": "cross-env NODE_ENV=production webpack --config webpack.config.prod.js",
"build:server": "cross-env NODE_ENV=production webpack --config webpack.config.server.js",
"clean": "rimraf dist",
"slate": "rimraf node_modules && npm install",
"lint": "eslint client server"
},
"pre-commit": [
"lint",
"test"
],
"repository": {
"type": "git",
"url": "git+https://github.com/Hashnode/mern-starter.git"
},
"bugs": {
"url": "https://github.com/Hashnode/mern-starter/issues"
},
"homepage": "https://github.com/Hashnode/mern-starter#readme",
"author": "Prashant Abhishek <prashant.abhishek7g#gmail.com>, Mayank Chandola <imayankchd#gmail.com>, Sandeep Panda <sandeep#hashnode.com>, Syed Fazle Rahman <fazle#hashnode.com>, Alkshendra Maurya <alkshendra#hashnode.com>",
"license": "MIT",
"dependencies": {
"babel-core": "^6.9.1",
"bcrypt-nodejs": "0.0.3",
"body-parser": "^1.15.1",
"compression": "^1.6.2",
"cross-env": "^1.0.8",
"cuid": "^1.3.8",
"express": "^4.13.4",
"intl": "^1.2.4",
"intl-locales-supported": "^1.0.0",
"isomorphic-fetch": "^2.2.1",
"jsonwebtoken": "^8.2.1",
"limax": "^1.3.0",
"mongoose": "^4.4.20",
"morgan": "^1.9.0",
"passport": "^0.4.0",
"passport-jwt": "^4.0.0",
"react": "^15.1.0",
"react-contexify": "^3.0.0",
"react-dom": "^15.1.0",
"react-helmet": "^3.1.0",
"react-intl": "^2.1.2",
"react-notify-toast": "^0.4.0",
"react-redux": "^4.4.5",
"react-router": "^2.4.1",
"react-router-dom": "^4.2.2",
"react-toastify": "^4.0.1",
"redux": "^3.5.2",
"redux-thunk": "^2.1.0",
"sanitize-html": "^1.11.4"
},
"devDependencies": {
"ava": "^0.15.2",
"babel-eslint": "^6.0.4",
"babel-loader": "^6.2.4",
"babel-plugin-webpack-loaders": "^0.7.0",
"babel-polyfill": "^6.9.1",
"babel-preset-es2015": "^6.9.0",
"babel-preset-es2015-native-modules": "^6.6.0",
"babel-preset-react": "^6.5.0",
"babel-preset-react-optimize": "^1.0.1",
"babel-preset-stage-0": "^6.5.0",
"babel-register": "^6.9.0",
"chai": "^3.5.0",
"chunk-manifest-webpack-plugin": "0.1.0",
"coveralls": "^2.11.9",
"css-loader": "^0.23.1",
"css-modules-require-hook": "^4.0.1",
"cssnano": "^3.7.0",
"enzyme": "^2.3.0",
"eslint": "^2.11.1",
"eslint-config-airbnb": "^9.0.1",
"eslint-plugin-ava": "^2.4.0",
"eslint-plugin-import": "^1.8.1",
"eslint-plugin-jsx-a11y": "^1.3.0",
"eslint-plugin-react": "^5.1.1",
"eventsource-polyfill": "^0.9.6",
"extract-text-webpack-plugin": "^1.0.1",
"file-loader": "^0.8.5",
"jsdom": "^9.2.1",
"json-loader": "^0.5.4",
"mock-css-modules": "^1.0.0",
"mockgoose": "^6.0.3",
"nock": "^8.0.0",
"nodemon": "^1.9.2",
"null-loader": "^0.1.1",
"nyc": "^6.4.4",
"postcss-cssnext": "^2.6.0",
"postcss-focus": "^1.0.0",
"postcss-loader": "^0.9.1",
"postcss-reporter": "^1.3.3",
"pre-commit": "^1.1.3",
"react-addons-test-utils": "^15.1.0",
"react-hot-loader": "^3.0.0-beta.2",
"redux-ava": "^2.0.0",
"redux-devtools": "^3.3.1",
"redux-devtools-dock-monitor": "^1.1.1",
"redux-devtools-log-monitor": "^1.0.11",
"rimraf": "^2.5.2",
"script-loader": "^0.7.2",
"sinon": "^1.17.4",
"style-loader": "^0.13.1",
"supertest": "^1.2.0",
"url-loader": "^0.5.7",
"webpack": "2.1.0-beta.8",
"webpack-dev-middleware": "^1.6.1",
"webpack-dev-server": "^2.1.0-beta.0",
"webpack-externals-plugin": "^1.0.0",
"webpack-hot-middleware": "^2.10.0",
"webpack-manifest-plugin": "^1.0.1"
},
"engines": {
"node": ">=4"
},
"ava": {
"files": [
"client/**/*.spec.js",
"server/**/*.spec.js"
],
"source": [
"client/**/*.js",
"server/**/*.js"
],
"failFast": true,
"babel": "inherit",
"require": [
"./server/util/setup-test-env.js"
]
},
"nyc": {
"include": [
"client/**/*.js",
"server/**/*.js"
],
"exclude": [
"**/*.spec.js",
"client/reducers.js",
"client/store.js",
"client/routes.js",
"server/util/setup-test-env.js",
"server/util/test-helpers.js",
"server/config.js",
"server/dummyData.js"
],
"reporter": [
"lcov",
"text",
"html"
]
}
}
Can this be fixed?
EDIT: It seems that the page sometimes loads correctly even without CTRL + F5 refresh. My gut tells me the issue lies with the order that the JS files are loaded. Any tips on how to keep the loading order the same in dev and prod?

In case of webpack.config.prod.js If you see this part of code
loader: ExtractTextPlugin.extract('style-loader', 'css-loader?localIdentName=[hash:base64]&modules&importLoaders=1!postcss-loader'), 42. loader: 'style-loader!css-loader?localIdentName=[name]__[local]__[hash:base64:5]&modules&importLoaders=1&sourceMap!postcss-loader',}
Just remove ExtractTextPlugin.extract and modify this part of code to
'style-loader!css-loader?localIdentName=[name]__[local]__[hash:base64:5]&modules&importLoaders=1&sourceMap!postcss-loader'

Webpack, Gulp, and React loading errors

My setup is below. If I run gulp in the directory with these files, then I get a boatload of errors that look like the following. They all have a similar signature but are failing to find a different part of react-bootstrap, react-dom, or the like.
Module not found: Error: Can't resolve 'react-bootstrap/lib/Input' in '...a/scripts/components'
# ./a/scripts/components/SearchBar.js 7:12-48
# ./a/scripts/pages/HomePage.js
# ./a/scripts/routes.js
# ./a/scripts/index.js
# multi webpack-dev-server/client?http://localhost:8083 webpack/hot/only-dev-server ./a/scripts/index
This makes me think it's to do with the loader. And in fact, if I run npm install, then after verifying that everything is installed and making a bundle.js, this error occurs:
ERROR in ./a/scripts/index.js
Module parse failed: Unexpected token (19:15)
You may need an appropriate loader to handle this file type.
|
| Router.run(routes, Router.HistoryLocation, function(Handler) {
| React.render(<Handler />, document.getElementById('entry'));
| });
|
# multi ./a/scripts/index
Which also suggests it's with the loader. I've since spent a lot of time trying to figure out why the loader wouldn't be working and am coming up blank. Help would be greatly appreciated.
package.json
{
"version": "1.0.0",
"main": "index.js",
"engines": {
"node": "0.12.7",
"npm": "2.7.5"
},
"scripts": {
"postinstall": "gulp build"
},
"author": "",
"license": "none",
"devDependencies": {
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-env": "^1.6.1",
"css-loader": "^0.28.8",
"del": "^3.0.0",
"file-loader": "^1.1.6",
"gulp": "^3.9.1",
"gulp-autoprefixer": "^4.1.0",
"gulp-cache": "^1.0.2",
"gulp-clean-css": "^3.9.2",
"gulp-concat": "^2.5.2",
"gulp-imagemin": "^4.1.0",
"gulp-jshint": "^2.1.0",
"gulp-livereload": "^3.8.0",
"gulp-notify": "^3.1.0",
"gulp-rename": "^1.2.0",
"gulp-ruby-sass": "^3.0.0",
"gulp-uglify": "^3.0.0",
"jsx": "^0.9.89",
"jsx-loader": "^0.13.2",
"lodash": "^4.17.4",
"moment": "^2.9.0",
"node-sass": "^4.7.2",
"plugin-error": "^0.1.2",
"react": "^16.2.0",
"react-bootstrap": "^0.32.0",
"react-hot-loader": "^3.1.3",
"react-router": "^4.2.0",
"react-script-loader": "^0.0.1",
"run-sequence": "^2.2.1",
"sass-loader": "^6.0.6",
"sass-material-colors": "0.0.5",
"style-loader": "^0.19.1",
"superagent": "^3.8.2",
"underscore": "^1.8.3",
"url-loader": "^0.6.2",
"webpack": "^3.10.0",
"webpack-dev-server": "2.10.1"
},
"dependencies": {
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-2": "^6.24.1"
},
}
.babelrc
{
"presets": ["env", "react"]
}
gulpfile.babel.js
var gulp = require('gulp'),
sass = require('gulp-ruby-sass'),
autoprefixer = require('gulp-autoprefixer'),
cleanCSS = require('gulp-clean-css'),
rename = require('gulp-rename');
var log = require('fancy-log');
var PluginError = require('plugin-error');
var webpack = require('webpack');
var WebpackDevServer = require('webpack-dev-server');
var webpackConfig = require("./webpack.config.js");
var runSequence = require('run-sequence');
var path = require('path');
var del = require('del');
var watch = true;
var verbose = true;
// Default to Dev Server
gulp.task('default', ["js-dev-server"]);
// Clean output directory
gulp.task('clean', () => del(['a/static/js/build/*', 'a/static/css/*'], {dot:true}))
gulp.task('styles', function() {
return sass('a/static/scss/styles.scss', { style: 'expanded' })
.pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1'))
.pipe(gulp.dest('a/static/css'))
.pipe(rename({suffix: '.min'}))
.pipe(cleanCSS())
.pipe(gulp.dest('a/static/css'));
});
gulp.task('watch', function() {
gulp.watch('a/static/scss/**/*.scss', ['styles']);
});
gulp.task('bundle', function() {
function bundle(err, stats) {
if (err) {
throw new PluginError("build", err);
}
console.log(stats.toString({
colors: true,
hash: verbose,
version: verbose,
timings: verbose,
chunks: verbose,
chunkModules: verbose,
cached: verbose,
cachedAssets: verbose
}));
}
webpack(webpackConfig).run(bundle)
});
gulp.task('build', ['clean'], cb => { runSequence(['styles', 'bundle']); });
gulp.task("js-dev-server", function(callback){
// modify some webpack config options
var myConfig = Object.create(webpackConfig);
myConfig.devtool = "eval-source-map";
myConfig.entry = [
'webpack-dev-server/client?http://localhost:8083',
'webpack/hot/only-dev-server',
'./a/scripts/index'
];
myConfig.plugins = [
new webpack.HotModuleReplacementPlugin(),
new webpack.NoEmitOnErrorsPlugin(),
new webpack.LoaderOptionsPlugin({debug: true})
];
myConfig.output['publicPath'] = "http://localhost:8083/static/js/build/"
myConfig.module = {
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loaders: ['react-hot-loader/webpack', 'jsx-loader?harmony', 'babel-loader']
},
{ test: /\.woff(\?v=\d+\.\d+\.\d+)?$/,
loader: "url-loader?limit=10000&minetype=a/font-woff" },
{ test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/,
loader: "url-loader?limit=10000&minetype=a/font-woff" },
{ test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
loader: "url-loader?limit=10000&minetype=a/octet-stream" },
{ test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,
loader: "file-loader" },
{ test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
loader: "url-loader?limit=10000&minetype=image/svg+xml" },
{ test: /\.scss$/, loader: "style-loader!css-loader!sass-loader?includePaths[]=" +
path.resolve(__dirname, "./a/static/scss/")
}
]
};
// Start a webpack-dev-server
new WebpackDevServer(webpack(myConfig), {
publicPath: "http://localhost:8083/static/js/build/",
stats: {
colors: true
},
inline: true,
hot: true,
historyApiFallback: true,
contentBase: 'http://localhost:5000/'
}).listen(8083, "localhost", function(err) {
if(err) throw new PluginError("webpack-dev-server", err);
log("[webpack-dev-server]",
"http://localhost:8083/webpack-dev-server/index.html");
});
});
webpack.config.js
var webpack = require('webpack');
var path = require('path');
var DEBUG = true;
module.exports = {
entry: [
__dirname + '/a/scripts/index'
],
output: {
path: __dirname + '/a/static/js/build',
filename: 'bundle.js',
},
plugins: [
new webpack.NoEmitOnErrorsPlugin(),
new webpack.optimize.UglifyJsPlugin({sourceMap: false,
output: {comments: false}}),
],
resolve: {
extensions: ['.js', '.jsx'],
modules: ['node_modules', 'web_modules', 'scripts', 'lib'],
},
module: {
rules: [
{
test: /\*.js.x?$/,
exclude: /node_modules/,
loaders: (DEBUG ? ['react-hot-loader/webpack'] : []).concat(['babel-loader'])
},
{ test: /\.woff(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&minetype=application/font-woff" },
{ test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&minetype=application/font-woff" },
{ test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&minetype=application/octet-stream" },
{ test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: "file-loader" },
{ test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&minetype=image/svg+xml" },
{ test: /\.scss$/, loader: "style-loader!css-loader!sass-loader?includePaths[]=" +
path.resolve(__dirname, "./a/static/scss/")
}
]
},
externals: {
"jquery": "jQuery"
}
};
index.js
'use strict';
var React = require('react'),
Router = require('react-router'),
routes = require('routes');
// set up in order to receive actions
var NotificationStore = require('stores/NotificationStore');
require('csrf'); // injects CSRF token into all $.ajax calls
require('../static/scss/playground.scss'); // loads stylesheet into JS
Router.run(routes, Router.HistoryLocation, function(Handler) {
React.render(<Handler />, document.getElementById('entry'));
});

This issue is due to your babel setup. You need to install babel-plugin-transform-react-jsx and adjust your .babelrc file. Like this:
{
"presets": ["env", "es2015", "react"],
"plugins": ["transform-react-jsx", "transform-object-rest-spread"]
}
example webpack.config.js:
const path = require('path')
const config = {
entry: {
app: ['whatwg-fetch','./src/index.js'],
},
devtool: 'inline-source-map',
devServer: {
contentBase: './public'
},
module: {
loaders: [
{
test: /\.js$/,
exclude: /node_modules/,
loader: 'eslint-loader'
},
{
test: /\.css/,
exclude: /node_modules/,
use: ['style-loader', 'css-loader'],
},
{
test: /.jsx?$/,
loader: 'babel-loader',
exclude: /node_modules/,
query: {
presets: ['es2015', 'react']
}
},
]
},
output: {
filename: 'app.bundle.js',
path: path.resolve(__dirname, 'public')
}
}
module.exports = config
example package.json:
{
"name": "react-news-app",
"version": "1.0.0",
"description": "get news and sentiment from headline articles",
"main": "index.js",
"scripts": {
"test": "jest --watch",
"start": "webpack-dev-server --port 3000"
},
"keywords": [
"api",
"react"
],
"author": "Stephen Collins",
"license": "MIT",
"dependencies": {
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"react": "^16.2.0",
"react-dom": "^16.2.0",
"whatwg-fetch": "^2.0.3"
},
"devDependencies": {
"babel-jest": "^22.0.4",
"babel-plugin-transform-object-rest-spread": "^6.26.0",
"babel-plugin-transform-react-jsx": "^6.24.1",
"babel-preset-env": "^1.6.1",
"chai": "^4.1.2",
"clean-webpack-plugin": "^0.1.17",
"css-loader": "^0.28.8",
"enzyme": "^3.3.0",
"enzyme-adapter-react-16": "^1.1.1",
"eslint": "^4.15.0",
"eslint-loader": "^1.9.0",
"jest": "^22.0.4",
"prop-types": "^15.6.0",
"sinon": "^4.1.3",
"style-loader": "^0.19.1",
"webpack": "^3.10.0",
"webpack-dev-server": "^2.10.0"
}
}