* drop support for Node.js v4; closes #7753 - remove version 4 from Travis build matrix - update environment support doc - update `CONTRIBUTING.md` - update `engines` field of root `package.json` Signed-off-by: Christopher Hiller <boneskull@boneskull.com> * update engines for babylon Signed-off-by: Christopher Hiller <boneskull@boneskull.com>
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Compiler environment support
NOTE: Compiler support does not dictate the runtime requirements of compiled code.
Officially supported environments
The Babel compiler is only supported in these environments:
- Modern browsers such as Chrome, Firefox, Safari, Edge etc.
- Node.js 6 and newer versions
Unsupported environments
This means that any other environment is not supported, this includes but is not limited to:
- Rhino
- Nashorn
- Internet Explorer
NOTE: If Babel works in any of the unsupported environments, it is purely coincidental and has no bearing on future compatibility. Use at your own risk.