However, a polyfill library like core-js provides code that adds the trimStart method to the string prototype. Its use is shown below: let greeting = ' Hello everyone' Ĭonsole.log(imStart()) // 'Hello everyone'īabel cannot help us in this situation because it only transpiles code. On the other hand, imStart(), which is an ES10 addition, is a direct modification of the String prototype. This task is used to transpile any ES8, ES7, and ES6 syntax in your front-end JavaScript files for.

Hence, it doesn’t offer any modifications to the language it just provides a syntactic sugar. This file configures a Grunt task called babel. older browsers and previous NodeJS versions) who do not provide the latest ECMAScript support. The nullish operator ( ?) allows one to do a null check which can be defined using the equality operator ( !=) and the tenery operator ( ?). BabelJS is a toolkit that enables developers to use ES2015+ language features (including bleeding edge ECMAScript release candidate features) on their Javascript code and produce a source code that is compatible with target environments (ie. To understand polyfiling, you must know the difference between ECMAScript syntax additions and core ECMAScript modifications. Did you know that transpilation is not same as polyfiling?

What is babel js