0
500
VistasSupport for the experimental syntax 'jsx' isn't currently enabled
I'm trying to run very simple code, but I'm getting an error, I didn't use the create react app!
It looks like my babel.config.js file is being ignored!
This is the structure of my small project:
My html file
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ReactJS</title>
</head>
<body>
<div id="app"></div>
<script src = 'bundle.js' ></script>
</body>
</html>
My index.js file:
import React from 'react';
import { render } from 'react-dom';
render(<h1>Hello World!!</h1>, document.getElementById('app'));
My package json:
{
"name": "front",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"dev": "webpack-dev-server --mode development",
"build": "webpack-dev-server --mode production"
},
"dependencies": {
"@babel/cli": "^7.10.5",
"@babel/core": "^7.10.5",
"@babel/plugin-proposal-class-properties": "^7.10.4",
"@babel/preset-env": "^7.10.4",
"@babel/preset-react": "^7.10.4",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"webpack": "^4.43.0",
"webpack-cli": "^3.3.12",
"webpack-dev-server": "^3.11.0"
},
"devDependencies": {
"@babel/plugin-transform-runtime": "^7.9.0",
"babel-loader": "^8.1.0",
"webpack-dev-server": "^3.10.3"
}
}
My webpack.config.js
const path = require('path');
module.exports = {
entry: path.resolve(__dirname, 'src', 'index.js'),
output: {
path: path.resolve(__dirname, 'public'),
filename: 'bundle.js'
},
devServer: {
contentBase: path.resolve(__dirname, 'public'),
},
module: {
rules: [{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
}
}]
},
};
And this is my babel.config.js
module.exports = {
"presets": ["@babel/preset-env", "@babel/preset-react"]
};
Error when
yarn webpack-dev-server --mode development
ERROR in ./src/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
SyntaxError: /root/treina/front/src/index.js: Support for the experimental syntax 'jsx' isn't currently enabled (4:8):
2 | import { render } from 'react-dom';
3 |
> 4 | render(<h1>Hello World!!</h1>, document.getElementById('app'));
| ^
Add @babel/preset-react (https://git.io/JfeDR) to the 'presets' section of your Babel config to enable transformation.
If you want to leave it as-is, add @babel/plugin-syntax-jsx (https://git.io/vb4yA) to the 'plugins' section to enable parsing.
at Parser._raise (/root/treina/front/node_modules/@babel/parser/lib/index.js:757:17)
at Parser.raiseWithData (/root/treina/front/node_modules/@babel/parser/lib/index.js:750:17)
at Parser.expectOnePlugin (/root/treina/front/node_modules/@babel/parser/lib/index.js:8849:18)
at Parser.parseExprAtom (/root/treina/front/node_modules/@babel/parser/lib/index.js:10170:22)
at Parser.parseExprSubscripts (/root/treina/front/node_modules/@babel/parser/lib/index.js:9688:23)
at Parser.parseMaybeUnary (/root/treina/front/node_modules/@babel/parser/lib/index.js:9668:21)
at Parser.parseExprOps (/root/treina/front/node_modules/@babel/parser/lib/index.js:9538:23)
at Parser.parseMaybeConditional (/root/treina/front/node_modules/@babel/parser/lib/index.js:9511:23)
at Parser.parseMaybeAssign (/root/treina/front/node_modules/@babel/parser/lib/index.js:9466:21)
at Parser.parseExprListItem (/root/treina/front/node_modules/@babel/parser/lib/index.js:10846:18)
ℹ ｢wdm｣: Failed to compile.
I'm using yarn and the WSL terminal
10 Respuestas
Responde la pregunta0
Mmm i think the problem is in your babel, try this:
- npm i --save-dev @babel/plugin-proposal-class-properties
- add loose:true in your babelrc
0
I remade my project from scratch and realized that I was wrong to not include the "D" at the end of the command:
yarn add webpack-dev-server -D
Now it's working!
0
inside the webpacker.yml file if using react with rails add jsx extension.
extensions:
- .jsx
- .mjs
- .js
- .sass
- .scss
- .css
- .module.sass
- .module.scss
- .module.css
- .png
- .svg
- .gif
- .jpeg
- .jpg
0
Just create a .babelrc file in the root of your project and add:
{
"presets": ["@babel/preset-env", "@babel/preset-react"]
}
0
In my case, Creating "babel.config.js" file with the following content worked.
module.exports = {
presets:[
"@babel/preset-env",
"@babel/preset-react"
]
}
0
The solution that worked for me was when I discovered node_modules/react-scripts/config/webpack.config.js contained:
// @remove-on-eject-begin
babelrc: false,
configFile: false,
By setting babelrc: true, I was finally able to get .babelrc changes to work. I'm guessing the configFile: parameter is what you will need to change. (Note, the babelrc appears to need to go into src/ for react-scripts to find it, reasonably likely to also be true for babel.config.js.)
0
Yet another possible cause. I got this error when try to run a project in a command prompt at a path that included symlinks. Changing directory directly into the real path solved the issue.
0
In my package.json, I added:
"babel": {
"presets": [
"@babel/react",
"@babel/env"
],
"plugins": [
"@babel/proposal-class-properties",
"@babel/plugin-transform-runtime"
]
}
0
2021
I fixed it adding
"jsx": "react-jsx"
to my "compilerOptions" on my tsconfig.json file
0
This https://stackoverflow.com/a/52693007/10952640 solved for me.
You need @babel/preset-react set also on webpack config:
module: {
rules: [
{
test: /\.(js|jsx)$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
options: { presets: ['@babel/env','@babel/preset-react'] },
},