Nullish coalescing operator is natively supported starting from eslint>=7.5.0. The easiest is set ES2020 in your package.json: { “eslintConfig”: { “parserOptions”: { “ecmaVersion”: 2020 } } }
Running the below command solved my issue npm install –save-dev @babel/plugin-proposal-private-property-in-object use –save-dev to install it under devDependencies
you can try install babel’s global version npm install -g babel-cli
React 15.5.0 contain new warnings belong to the changes that are coming on React 16, the warning that you are getting, is actually telling you that you have to implement the new way (since the current way that you are using is going to be deprecated on 16). React.createClass, you have 2 options, first one … Read more
In my opinion you transpile TypeScript code to ES6 by using typescript and then re-transpile it to es5/es3 using babel to use in most javascript run times. Now because typescript compiler gives you es6 javascript you can do tree-shaking which is only supported for es6 module. And after tree-shaking your es6 javascript you can now … Read more
1.a What Preset is needed? You will need to install Babel firstly with npm install babel-core –save-dev in the root directory of your project using a Terminal window like Command Prompt. Once installed, you will need to install the es2015 preset with npm install babel-preset-es2015 –save-dev. Babel-Core is Promises/A+ Compliant but not ideal for usage … Read more
Quick fix What if you were to replace %PUBLIC_URL% with the actual path. I think that Babel is having issues transpiling the %. Try replacing %PUBLIC_URL%/favicon.ico with /public/favicon.ico and the issue is resolved. Better fix Add a new rule to your webpack.config.js. //… { test: /\.(png|svg|jpg|jpeg|gif|ico)$/, exclude: /node_modules/, use: [‘file-loader?name=[name].[ext]’] // ?name=[name].[ext] is only necessary … Read more
Using .babelrc is always recommended: { comments: false } If using babel-cli, you can use the –no-comments options to achieve the same behaviour. The latest version of babel-cli includes tests that check for this behaviour to be implemented correctly. EDIT It does look like a problem with babel CLI ignoring the comments in .babelrc , … Read more
Getting the same issue but given an hour on it get the solution When we run npm start then you got this kind of an error that is version related issues for this issue. Go to node_modules folder: Project->node_modules->react-scripts->package.json check the package.json file there you got : “babel-loader”: “8.0.4” first remove : babel-loader folder for … Read more
Note that the Babel translation is assuming strict mode, but your result with window indicates you’re running your code in loose mode. If you tell Babel to assume loose mode, its transpilation is different: var _this = this; // ** var arrowObject = { name: ‘arrowObject’, printName: function printName() { console.log(_this); // ** } }; … Read more