My app does not recognize JSX when I run babel - reactjs

I am following instructions from a React course when setting up Babel with Webpack and now I get this error:
ERROR in ./src/app.js
Module build failed: SyntaxError: C:/Users/38164/Desktop/react-course-projects/indecision-app/src/app.js: Unexpected token (4:17)
image of the error
Here are the files from the setup:
app.js
import React from 'react';
import ReactDOM from 'react-dom';
const template = <p>testing</p>;
ReactDOM.render(template, document.getElementById('app'));
webpack.config.js
const path = require("path");
module.exports = {
entry: "./src/app.js",
output: {
path: path.join(__dirname, "public"),
filename: "bundle.js",
},
module: {
rules: [{
loader: "babel-loader",
test: /\.js$/,
exclude: /node_modules/
}
]
}
};
package.json
{
"name": "indecision-app",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"serve": "live-server public/",
"build": "webpack --watch",
"build-babel": "babel src/app.js --out-file=public/scripts/app.js --presets=env,react --watch"
},
"dependencies": {
"#babel/core": "^7.20.12",
"#babel/preset-env": "^7.20.2",
"#babel/preset-react": "^7.18.6",
"babel-cli": "6.24.1",
"babel-loader": "7.1.1",
"live-server": "^1.2.2",
"react": "16.0.0",
"react-dom": "16.0.0",
"validator": "8.0.0",
"webpack": "3.1.0"
}
}
.babelrs
{
"presets": [
"#babel/preset-env",
"#babel/preset-react"
]
}
Does anyone have any suggestions?
There is probably something minor, but I can't figure it out, as this is new for me.

Related

No appropriate loader to handle js WebPack babel-loader

I got unexpected error about bundling a JSON data. I tried to use json-loader to bundle json, but got the same error there.
ERROR in ./src/index.js 6:7
Module parse failed: Unexpected token (6:7)
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 data from './data/recipes.json';
|
> render(<Menu recipes={data} />, document.getElementById('root'));
webpack 5.53.0 compiled with 1 error in 82 ms
./src/index.js
import React from 'react';
import { render} from 'react-dom';
import Menu from './components/Menu';
import data from './data/recipes.json';
render(<Menu recipes={data} />, document.getElementById('root'));
webpack.config.js
var path = require('path');
module.exports = {
entry: './src/index.js',
output: {
path: path.join(__dirname, 'dist', 'assets'),
filename: 'bundle.js'
},
module: {
rules: [{ test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' }]
}
};
.babelrc
{
"presets": [
"#babel/preset-env",
[
"#babel/preset-react",
{
"runtime": "automatic"
}
]
]
}
package.json
{
"name": "recipes-app",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack --mode production"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"react": "^17.0.2",
"react-dom": "^17.0.2",
"serve": "^12.0.1"
},
"devDependencies": {
"#babel/core": "^7.15.5",
"#babel/preset-env": "^7.15.6",
"#babel/preset-react": "^7.14.5",
"babel-loader": "^8.2.2",
"webpack": "^5.53.0",
"webpack-cli": "^4.8.0"
}
}
In 'webpack.config.js' file I tried to change 'loader' to 'use', same thing...
import ReactDOM from 'react-dom' and ReactDOM.render() also same thing...
webpack.config.js was at the wrong place of a dir structure.

webpack with babel showing error Module build failed (from ./node_modules/babel-loader/lib/index.js):

I am trying to create a react app using webpack and babel,but when i actually start webpack dev server,using yarn run start,it shows the following error:-
i am using babel-loader version 8.1.0 and #babel/core version 7.10.2
My package.json:-
{
"name": "reactTemplate",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"start": "webpack-dev-server --mode development --open --hot",
"build": "webpack --mode production"
},
"dependencies": {
"react": "^16.13.1",
"react-dom": "^16.13.1"
},
"devDependencies": {
"babel-loader": "^8.1.0",
"#babel/core": "^7.10.2",
"#babel/preset-env": "^7.10.2",
"#babel/preset-react": "^7.10.1",
"html-webpack-plugin": "^4.3.0",
"webpack": "^4.43.0",
"webpack-cli": "^3.3.11",
"webpack-dev-server": "^3.11.0"
}
}
My .babelrc:-
{
"presets": ["#babel/preset-env", "#babel/preset-react"]
}
My webpack.config.js:-
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: './src/index',
output: {
path: path.join(__dirname, './dist'),
filename: 'index_bundle.js',
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
},
},
],
},
plugins: [
new HtmlWebpackPlugin({
template: './src/index.html',
}),
],
};
If you are running a very simple hello world example and extension is js then your settings seem fine. If you are using jsx files as well the add this to the webpack
test: /\.(js|jsx)$/,

webpack --watch does not want to process react component inside my index.js

I'm an old hat coder but I'm new to react, and it looks like I need another pair of eyeballs. I'm trying to setup a very basic React app from scratch (for practice) and it fires up fine, but when I try to run webpack --watch it's giving me the following error:
Here's the error I'm getting:
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.
| import App from "./components/App.js";
|
> ReactDOM.render(<App />, document.getElementById('root'));
|
Here's my webpack.dev.config file:
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
module.exports = {
entry: "./src/index.js",
output: {
path: path.join(__dirname, "/dist"),
filename: "index_bundle.js"
},
module: {
rules: [{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: "babel-loader"
},
},
{
test: /\.css$/,
use: ["style-loader", "css-loader"]
}
]
},
plugins: [
new HtmlWebpackPlugin({
template: "./src/index.html"
})
]
};
Here's my package.json file:
{
"name": "react-boilerplate",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"watch": "webpack --watch --open",
"dev": "./node_modules/.bin/webpack-dev-server --mode development --config ./webpack.dev.config.js",
"build": "webpack --mode production"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"#babel/core": "^7.3.3",
"#babel/preset-env": "^7.3.1",
"#babel/preset-react": "^7.0.0",
"babel-loader": "^8.0.5",
"babel-preset-es2015": "^6.24.1",
"babel-preset-stage-0": "^6.24.1",
"css-loader": "^2.1.0",
"html-webpack-plugin": "^3.2.0",
"style-loader": "^0.23.1",
"webpack": "^4.29.5",
"webpack-cli": "^3.2.3",
"webpack-dev-server": "^3.2.0"
},
"dependencies": {
"react": "^16.8.3",
"react-dom": "^16.8.3"
}
}
Here's my .babelrc file:
{
"presets": ["#babel/preset-env", "#babel/preset-react"]
}
And finally... my index.js file
import React from "react";
import ReactDOM from "react-dom";
import App from "./components/App.js";
ReactDOM.render(<App />, document.getElementById('root'));
Directory Structure
This ought to be pretty straight-forward but I guess I'm just not seeing something. I'd appreciate any help!!

Module not found: Can't resolve custom package [React Import]

I am trying to create my very first node package, it was successfully publish and live on npmjs.com website but whenever i include it on a sample react project using create-react-app i get this following error
Here's how i import it
import IconTooltip from 'react-icons-tooltip';
Here's the error
Module not found: Can't resolve './react-icons-tooltip' in '/home/ubuntu/workspace/lasting/src/Components'
This is the Package package.json file
{
"name": "react-icons-tooltip",
"version": "1.0.4",
"description": "",
"main": "./lib/IconTooltip.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack --progress --colors --p",
"transpile": "node_modules/.bin/babel ./src/index.js --presets babel-preset-es2015 --out-file lib/IconTooltip.js"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-core": "^6.26.0",
"babel-loader": "^7.1.3",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"webpack": "^4.0.1",
"webpack-cli": "^2.0.10"
},
"dependencies": {
"prop-types": "^15.6.1",
"react": "^16.2.0",
"react-dom": "^16.2.0"
}
}
webpack.config.js
const webpack = require("webpack");
module.exports = {
entry: './src/index.js',
output: {
path: __dirname + '/build',
filename: 'IconToolTip.js'
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
loader: 'babel-loader'
},
{
test: /\.css$/,
loaders: ['style-loader', 'css-loader']
}
]
},
plugins: [
new webpack.DefinePlugin({
'process.env': {
'NODE_ENV': JSON.stringify('production')
}
})
]
};
If i import the local the package seems to work fine
import IconTooltip from './lib/IconTooltip';
TIA!
I had that same problem before and that fixed it. I checked other modules and they all enter in index.js, is all I can say :)

Webpack with babel-loader doesn't recognize Typescript

I am using webpack and trying to leverage an existing React component library written in TS.
However, with the settings below, the webpack is giving 'unexpected Token' error. I copied the problematic code to babel online transpiler https://babeljs.io/repl/ but it is not showing any error.
I am very new to React development, any criticism/questions/answers are welcomed.
Thanks!
This is my webpack.config.js
var path = require("path")
var webpack = require('webpack')
var BundleTracker = require('webpack-bundle-tracker')
module.exports = {
context: __dirname,
entry: [
'webpack-dev-server/client?http://localhost:3000',
'webpack/hot/only-dev-server',
'./app/static/js/index'
],
output: {
path: path.resolve('./app/static/bundles/'),
filename: '[name]-[hash].js',
publicPath: 'http://localhost:3000/static/bundles/',
},
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.NoEmitOnErrorsPlugin(),
new BundleTracker({filename: './webpack-stats.json'}),
],
module: {
loaders: [
{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
loader: ["babel-loader?presets[]=es2015,presets[]=react"],
},
{
test: /\.tsx?$/,
loader: 'ts-loader',
options: {
configFileName: './tsconfig.json'
},
exclude: /node_modules/
},
{
test: /\.css$/,
loader: 'style-loader!css-loader'
}
]
},
resolve: {
extensions: ['.js', '.jsx', '.ts', '.tsx', '.css']
}
}
My entry point file index.js:
import React from 'react';
import ReactDOM from 'react-dom';
import * as PropTypes from 'prop-types';
interface IDemoState {
value ?: string;
}
class Test extends React.Component<{}, IDemoState> {
state: IDemoState = {
value : 'general'
}
}
ReactDOM.render(<Test />, document.getElementById('tabnav'));
Package.json
{
"name": "djangoproject",
"version": "1.0.0",
"description": "Django Project",
"main": "index.js",
"scripts": {
"build": "webpack --config webpack.config.js --progress --colors",
"build-production": "webpack --config webpack.prod.config.js --progress --colors",
"watch": "node server.js"
},
"keywords": [
"Django"
],
"license": "ISC",
"devDependencies": {
"adp-css-framework": "^1.5.3",
"adp-react-components": "^1.4.3",
"adp-react-icons": "^1.16.0",
"babel": "^6.23.0",
"babel-cli": "^6.24.1",
"babel-core": "^6.25.0",
"babel-loader": "^7.1.0",
"babel-preset-env": "^1.5.2",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"css-loader": "^0.28.4",
"react": "^15.6.1",
"react-dom": "^15.6.1",
"react-hot-loader": "^1.3.1",
"style-loader": "^0.18.2",
"ts-loader": "^2.2.1",
"typescript": "^2.4.1",
"webpack": "^3.0.0",
"webpack-bundle-tracker": "^0.2.0",
"webpack-dev-server": "^2.5.0"
}
}
If I run npm run watch, I got this error:
ERROR in ./app/static/js/index.js
Module build failed: SyntaxError: xxxxx./app/static/js/index.js: Unexpected token (10:20)
8 |
9 | class Test extends React.Component<{}, IDemoState> {
> 10 | state: IDemoState = {
| ^
11 | value : 'general'
12 | }
13 | }
# multi webpack-dev-server/client?http://localhost:3000 webpack/hot/only-dev-se
rver ./app/static/js/index
The problem finally goes away after I changed the ts-loader to awesome-typescript-loader and write everything in a tsx file.

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