Since Babel 6 use babel-register hook to make on-the-fly transpilation. First: npm install babel-register Then require it with: require(‘babel-register’); // not using // require(‘babel/register’); // or // require(‘babel-core/register); To Convert your Ecmascript 6 code to ecmascript 5, you must set Babel presets option with require babel-register Like this: require(‘babel-register’)({ presets: [ ‘es2015’ ] }); Unlike … Read more
For Babel version 6 the package name is babel-preset-es2015 and for Babel version 7 the package name is @babel/preset-es2015. From the error it seems that you’re using version 7. The es20XX-presets are deprecated, so I recommend you switch to @babel/preset-env. First install the preset (using npm): npm install –save-dev @babel/preset-env Then add the preset to … Read more
Update: With non-legacy versions of Webpack you can define an array of loaders in the Webpack configuration. If you need to use an older versions of Webpack or add the options inline, the original answer is below. The way to do this is to set the query parameters in the loader string itself, as the … Read more
Jest sets the env variable to test, so I had to add my presets to the env setting in .babelrc: { “plugins”: [“syntax-dynamic-import”, “transform-runtime”], “presets”: [ [ “es2015”, { “modules”: false } ], “react”, “stage-0” ], “env”: { “start”: { “presets”: [ “react-hmre” ] }, “test”: { “presets”: [“es2015”, “react”, “stage-0”] } } }
For Babel >= 7.x ES6 code has two processing modes: “script” – When you load a file via a <script>, or any other standard ES5 way of loading a file “module” – When a file is processed as an ES6 module In Babel 7.x, files are parsed as “module” by default. The thing that is … Read more
Maybe they are same? That is correct, the preset- piece is optional. Since you are doing presets: [“@babel/env”] Babel already knows that it is a preset since it is in the presets array, so it will add the preset- into the module name automatically. This applies to plugins as well. See the table in the … Read more
I got the same error with babel 7.x and and “babel-loader”: “^8.0.4” I solved the issue by changing the following dependencies in package.json. I got the solution from these link “devDependencies”: { “@babel/core”: “^7.1.6”, “@babel/preset-env”: “^7.1.6”, “@babel/preset-react”: “^7.0.0”, “babel-loader”: “^8.0.4”, “webpack”: “^4.25.1”, “webpack-cli”: “^3.1.2” } and in .babelrc { “presets”: [“@babel/env”, “@babel/react”] } or in … Read more
Babel v6 As of Babel v6, Babel doesn’t contain any transformers itself anymore. You have to explicitly specify any feature you want to transform. Presets – non ES2015 environment The quickest way to get this working is to use presets which already contain the set of plugins needed to transform ES2015 and newer proposals. For … Read more
The differences are minuscule. Both declare a variable. A const variable is constant also within your module, while a function declaration theoretically could be overwritten from inside the module An arrow function is a function expression, not a function declaration, and the assignment can lead to problems for circular dependencies An arrow function cannot be … Read more
ES6 imports are a recently introduced feature and the current stable version of Node does not support them yet. Node.js issue tracker has an open issue for this – but until V8 and Node add support for this feature, you will need to use a transpiler (most popular one being babel) to be able to … Read more