Long-term support of polyglot.js.nashorn-compat

[jackie-vn]

Hi everyone,

I recently migrated from Java 8 (Nashorn) to Java 17 and am using GraalJS.
To keep some legacy Nashorn-based JavaScript working, I enabled:
-Dpolyglot.js.nashorn-compat=true

Is this flag expected to be supported long term, or is it only a temporary compatibility option?
Is there any known GraalJS or Java version where this flag is planned to be removed or no longer effective?

Thanks!

[iamstolis]

There are no plans to remove this option by now. It is important for us to simplify the migration from Nashorn. I would say that the option in experimental mainly to emphasize that it is recommended not to depend on various Nashorn-specific extensions/deviations from the specification and to use/migrate to the standard mode when possible.

[jackie-vn]

Thanks for the clarification — this is very helpful for our migration planning. Much appreciated!

[jackie-vn]

If Nashorn compatibility mode were ever to be deprecated or removed in the future, is there any general practice for advance notice (e.g. months ahead), and where would such announcements typically be made (release notes, discussions, documentation)?
Thank you.

[alina-yur]

@jackie-vn Typically we announce any major changes one release in advance in the release notes.