Preset files are not allowed to export objects

I have a carousel file in which I want to get index.js and build block.build.js so my webpack.config.js is

//webpack.config.js var config = { entry: './index.js', // Webpack output: { path: __dirname, filename: 'block.build.js', }, devServer: { contentBase: './Carousel' }, module : { rules : [ { test: /.js$/, loader: 'babel-loader', exclude: /node_modules/, query: { presets: ['react', 'es2015'], plugins: ['transform-class-properties'] } } ] } }; module.exports = config;

The package.json which I use is below :

{ "name": "carousel", "version": "1.0.0", "description": "", "main": "webpack.config.js", "dependencies": { "@babel/core": "^7.0.0-beta.40", "babel-cli": "^6.26.0", "babel-loader": "^8.0.0-beta.0", "babel-plugin-lodash": "^3.3.2", "babel-plugin-react-transform": "^3.0.0", "babel-preset-react": "^6.24.1", "cross-env": "^5.1.3", "lodash": "^4.17.5", "react": "^16.2.0", "react-dom": "^16.2.0", "react-swipeable": "^4.2.0", "styled-components": "^3.2.1" }, "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "watch": "webpack --watch", "start": "webpack-dev-server --open", "build": "webpack" }, "devDependencies": { "webpack": "^4.1.1", "webpack-cli": "^2.0.10", "webpack-dev-server": "^3.1.0" }, "author": "brad traversy", "license": "ISC" }

but I get this error message

ERROR in ./index.js Module build failed: Error: Plugin/Preset files are not allowed to export objects, only functions.

Does anyone know how to solve this ?

Answer1:

You're using a combination of Babel 6 and Babel 7. There is no guarantee of compatibility across versions:

"@babel/core": "^7.0.0-beta.40", "babel-cli": "^6.26.0", "babel-loader": "^8.0.0-beta.0", "babel-plugin-lodash": "^3.3.2", "babel-plugin-react-transform": "^3.0.0", "babel-preset-react": "^6.24.1",

should be

"@babel/core": "^7.0.0-beta.40", "@babel/cli": "^7.0.0-beta.40", "babel-loader": "^8.0.0-beta.0", "babel-plugin-lodash": "^3.3.2", "babel-plugin-react-transform": "^3.0.0", "@babel/preset-react": "^7.0.0-beta.40",

and

query: { presets: ['react', 'es2015'], plugins: ['transform-class-properties'] }

would be

query: { presets: ['@babel/react', '@babel/es2015'], plugins: ['@babel/proposal-class-properties'] }

I'm also confused because you didn't mention @babel/proposal-class-properties in your package.json, but assuming it is in there it should also be updated.

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