Babel

Babel was created to help developers avoid the problem from switching between two syntax variants of a programming language.

After all the Python 2.x and 3.x mess, a library like Babel will help you easily convert code written in the more modern ES6 to the older ES5.

As a side effect of this conversion, this also enables programmers to deploy applications written for a more modern JavaScript environment into today's Web browsers.

Babel lets them run modern code in an alternative ES5 form, also supporting source maps, a feature that can greatly help out when debugging your code.

The library has been well planned and along with its release there are also lots of plugins for various build systems, Node.js CLI integration, and Ruby on Rails support.

Support is also included for Webpack, Broccoli, Gulp, Grunt, Browserify, Duo, Brunch, Gobble, Make, Jest, Connect, Jade, Karma, Nodemon, and Mocha.

Babel was previously known as 6to5.

What is new in this release:

• Bug Fix:
• Don't consider JSXAttribute names to be valid ReferencedIdentifiers.

What is new in version 6.6.5:

• Bug Fix:
• Don't consider JSXAttribute names to be valid ReferencedIdentifiers.

What is new in version 6.4.6:

• Bug Fix:
• Don't consider JSXAttribute names to be valid ReferencedIdentifiers.

What is new in version 6.2.2:

• Bug Fix:
• Don't consider JSXAttribute names to be valid ReferencedIdentifiers.

What is new in version 5.8.24:

• Bug Fix:
• Don't consider JSXAttribute names to be valid ReferencedIdentifiers.

What is new in version 5.2.17:

• Fixed parse API not adding all the correct pipeline transformers.

What is new in version 5.0.12:

• Bug Fix:
• Fix constructor spreading of typed arrays.
• Fix break/continue/return aliasing of non-loops in block scoping transformer.

What is new in version 4.6.1:

• Breaking Change:
• Remove commonStandard module formatter and make it the default behaviour of all the strict module formatters.

What is new in version 3.4.1:

• Bug Fixes:
• Fix conflicting --module-ids shorthand arg in $ 6to5.
• Add require hook options to cache key.
• Fix strict module formatter.

What is new in version 3.3.12:

• Bug Fix:
• Don't override MemberExpressions with core-js in selfContaiend if a local binding exists.