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I tried to upgrade Webpack and babel to 4, 7 respectively but couldn’t make it work. Also the official doc isn’t helping much with the upgrade
I am getting following issue
compiler error: ERROR in Cannot find module '@babel/core' @ multi main
dependencies I am using:
"babel-core": "^6.26.3", "babel-eslint": "^9.0.0", "babel-loader": "^8.0.0", "babel-plugin-transform-class-properties": "^6.24.1", "babel-plugin-transform-object-rest-spread": "^6.26.0", "babel-polyfill": "^6.26.0", "babel-preset-env": "^1.7.0", "babel-preset-react": "^6.24.1", "webpack": "^4.15.0", "webpack-cli": "^3.0.8", "webpack-dev-server": "^3.1.4" Please let me know if more details required.
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Babel 7.19 is released!
Tokens removed. In previous versions tokens were always attached to the AST on the top-level. In the latest version of @babel/parser we removed this behavior and made it disabled by default to improve the performance of the parser.
You can also check the version of babel-cli by finding the babel-cli folder in node_modules and looking at the version property of the package. json that is at the base of that folder. If babel-cli was installed globally via -g flag of npm install , you could check the version by executing command babel --version .
Use babel-upgrade
Tested on [email protected], [email protected] and [email protected]
You can use following script. (npx on node 5+ only)
npx babel-upgrade --write The --write flag writes the updates to your package.json and .babelrc.
You will end up with following modifications to package.json:
"devDependencies": { "@babel/core": "^7.4.0", "@babel/plugin-proposal-class-properties": "^7.0.0", "@babel/plugin-proposal-json-strings": "^7.0.0", "@babel/plugin-proposal-private-methods": "^7.4.0", "@babel/plugin-syntax-dynamic-import": "^7.0.0", "@babel/plugin-syntax-import-meta": "^7.0.0" } .babelrc
{ "plugins": [ "@babel/plugin-syntax-dynamic-import", "@babel/plugin-syntax-import-meta", [ "@babel/plugin-proposal-class-properties" ], "@babel/plugin-proposal-json-strings", [ "@babel/plugin-proposal-private-methods" ] ] } Out of the above plugins you need @babel/plugin-proposal-class-properties @babel/plugin-proposal-private-methods to make private properties work correctly if you choose to implement them.
If you are using eslint, dont forget to set your parser as babel-eslint like so in your .eslintrc file:
{ "parser": "babel-eslint" } Babel changed the name of the module babel-core to @babel/core. Just run npm install @babel/core. This will install the latest version of Babel core.
Most of the packages in Babel has been renamed to follow the pattern @babel/PACKAGE_NAME. So if you want to upgrade, change the package names to follow the pattern and run npm install.
To upgrade to Babel 7 you can use this migration guide.
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