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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 on-the-fly reporting of syntax errors and strict-mode warnings.
The compiler for next generation JavaScript.
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. Polyfill features that are missing in your target environment (through a third-party polyfill such as core-js)
Babel is a tool that helps you write code in the latest version of JavaScript. When your supported environments don't support certain features natively, Babel will help you compile those features down to a supported version.
Babel is a JavaScript compiler. Use next generation JavaScript, today. Get browser-compatible JavaScript out. Check out our REPL to experiment more with Babel! Personal Experiences at Babel #1 — A PR with Unusually High Number of Reviews.
Babel ships with built-in support for JSX. Use it together with the babel-sublime package to bring syntax highlighting to a whole new level.
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What is Babel and how will it help you write JavaScript?
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The community maintained compiler for next generation JavaScript, today. - Babel