Babel throwing Support for the experimental syntax 'jsx' isn't currently enabled

Question

I started newly writing unit test cases using Jest and Enzyme for the react application and when try to run test cases using jest like "test": "jest --watch" rather "test": "react-scripts test" tests going through babel for the runner to understand react syntax.

And have been doing setup step by step using babel but this error Support for the experimental syntax 'jsx' isn't currently enabled stopping me to go further. And as suggested in some threads I have been trying with npm install --save-dev @babel/plugin-transform-react-jsx and tried to add the same plugin into babel configuration like shown in below package.json file but still no luck.

And this is my package.json

{   "name": "multitheme-app",   "version": "0.1.0",   "private": true,   "dependencies": {     "@material-ui/core": "^3.9.0",     "@material-ui/icons": "^3.0.2",     "axios": "^0.18.0",     "babel-plugin-transform-export-extensions": "^6.22.0",     "jest-css-modules": "^2.1.0",     "react": "^16.8.1",     "react-dom": "^16.8.1",     "react-redux": "^6.0.0",     "react-router-dom": "^4.3.1",     "react-scripts": "2.1.5",     "redux": "^4.0.1",     "redux-thunk": "^2.3.0"   },   "scripts": {     "start": "react-scripts start",     "build": "react-scripts build",     "test": "react-scripts test",     "eject": "react-scripts eject"   },   "eslintConfig": {     "extends": "react-app"   },   "browserslist": [     ">0.2%",     "not dead",     "not ie <= 11",     "not op_mini all"   ],   "babel": {     "presets": [       "@babel/preset-react",       "@babel/preset-env",       "@babel/preset-flow"     ],     "plugins": [       "@babel/plugin-transform-modules-commonjs",       "@babel/plugin-transform-react-jsx"            ]   },   "devDependencies": {     "@babel/cli": "^7.10.4",     "@babel/core": "^7.10.4",     "@babel/plugin-proposal-class-properties": "^7.10.4",     "@babel/plugin-syntax-dynamic-import": "^7.8.3",     "@babel/plugin-transform-modules-commonjs": "^7.10.4",     "@babel/plugin-transform-react-jsx": "^7.10.4",     "@babel/preset-env": "^7.10.4",     "@babel/preset-es2015": "^7.0.0-beta.53",     "@babel/preset-flow": "^7.10.4",     "@babel/preset-react": "^7.10.4",     "@babel/runtime": "^7.10.4",     "babel-eslint": "^10.1.0",     "babel-jest": "^26.1.0",     "babel-loader": "^7.1.5",     "babel-plugin-transform-decorators-legacy": "^1.3.5",     "babel-preset-stage-0": "^6.24.1",     "enzyme": "^3.11.0",     "enzyme-adapter-react-16": "^1.15.2",     "enzyme-to-json": "^3.5.0",     "jest": "^23.6.0",     "jest-cli": "^26.1.0"   },   "jest": {     "verbose": true,     "clearMocks": true,     "collectCoverage": true,     "setupTestFrameworkScriptFile": "<rootDir>/src/setupTest.js",     "transform": {       "^.+\\.js$": "babel-jest"     },     "moduleNameMapper": {       "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",       "\\.(css|scss)$": "identity-obj-proxy"     }   } } 

and here is my test case file

import React from 'react'; import Adapter from 'enzyme-adapter-react-16'; import { shallow, configure } from 'enzyme';  import App from './App';  configure({adapter: new Adapter()});   describe('MyComponent', () => {   it('should render correctly in "debug" mode', () => {     const component = shallow(<App debug />);     expect(component).toMatchSnapshot();   }); }); 

Answer 1

If this issue is related to using jest,

jest config for your package.json should look like

with typescript -

"jest": {     ...          "transform": {        "^.+\\.(ts|tsx|js|jsx)$": "ts-jest"     },          ... }  

with js -

"jest": {     ...          "transform": {        "^.+\\.(js|jsx)$": "babel-jest"     },          ... }  

Answer 2

Looking at the error it looks its not able to load the preset for react. Switch to the config file and move the configuration of babel from package.json to it. A sample file would look like below and will be located at the same level as package.json and called as babel.config.js

module.exports = function (api) {   const presets = [       '@babel/preset-env',     '@babel/preset-react',     '@babel/preset-flow'   ];   const plugins = [     '@babel/plugin-transform-runtime',   ];    /** this is just for minimal working purposes,      * for testing larger applications it is      * advisable to cache the transpiled modules in      * node_modules/.bin/.cache/@babel/register* */   api.cache(false);    return {     presets,     plugins   }; };