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What is Babel? Babel is a JavaScript compiler Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments. Here are the main things Babel can do for you: Transform syntax
There are quite a few tools in the Babel toolchain that try to make it easy for you to use Babel whether you're an "end-user" or building an integration of Babel itself. This will be a quick introduction to those tools and you can read more about them in the "Usage" section of the docs.
Learn more about Babel with our getting started guide or check out some videos on the people and concepts behind it.
@babel/standalone provides a standalone build of Babel for use in browsers and other non-Node.js environments.
babel.config.json < .babelrc < programmatic options from @babel/cli In other words, babel.config.json is overwritten by .babelrc , and .babelrc is overwritten by programmatic options. For each config source, Babel prints applicable config items (e.g. overrides and env ) in the order of ascending priority.
Babel can transpile ES2015 Modules to several different formats including Common.js, AMD, System, and UMD. You can even create your own. For more details see the modules docs.
This list is used by @babel/register and @babel/cli to determine which files need transpiling. Extending this list isn't possible, however @babel/cli does provide ways to support other extensions with --extensions .
By default, @babel/preset-env (and Babel plugins in general) grouped ECMAScript syntax features into collections of closely related smaller features. These groups can be large and include a lot of edge cases, for example "function arguments" includes destructured, default and rest parameters.
It is automatically loaded when using @babel/preset-env's useBuiltIns: "usage" option or @babel/plugin-transform-runtime. Babel includes a polyfill that includes a custom regenerator runtime and core-js .
Install language-babel package and follow the instructions. Emacs Install the js2-mode that's likely the best JavaScript mode available for Emacs. It has very accurate syntax highlighting using a recursive-descent parser, strict recognition of the Ecma-262 language standard, supports most Rhino and SpiderMonkey extensions from 1.5 and up, and ...
