I'm very happy to announce that after more than a year in the making Opal v0.11.0 has finally been released!
This version is probably the last one before 1.0, it's packed with great new features, a ton of fixes and a complete reimplementation of the parser.
Notable Changes since Opal v0.10.0
The new parser is much stricter, so expect some code that was happily parsed to be rejected. The good news is your code will be even closer to the standard, and the parser's error messages are generally better and will tell you exactly where the syntax error is.
The constant lookup system has been rewritten and now the algorithm is closer to what MRI does while still taking advantage of an aggressive cache.
Opal::Server was relying on Sprockets which is now extracted to the resurrected
opal-sprockets gem and can be found under
opal gem still provides a basic server which can be accessed as
Opal::SimpleServer. The simple server uses the internal
Opal::Builder instead of Sprockets and has kept the same API where possible.
Headless Chrome is the new standard, while
phantomjs has been officially abandoned.
Opal v0.11.0 replaced the
phantomjs CLI runner with
chrome. While there's no plan to restore support for
phantomjs if your app really needs it please contact the core team on GitHub or Slack, if there's enough interest we'll do our best to extract and publish
phantomjs runner code as an external gem.
require, but Opal goes out of its way to infer the required path (e.g. it parses calls to
File.expand_path and resolves them at compile time).
Previously whenever a call to
require couldn't be resolved it ended in raising an exception and blocked the compilation, often unnecessarily forcing the user to add the requested path to stubs (see the
With Opal v0.11.0 calls to
require that cannot be resolved at compile time will just be ignored and will raise a
LoadError at runtime if the given path still isn't found. This is closer to what happens under MRI. It's still possible to revert back to the old behavior by settings
Opal::Config.dynamic_require_severity = :error (see the relevant code in opal/config.rb).
Read the Changelog for further details
As always, Opal v0.11.0 includes many bug fixes and improvements to the internals of the Opal libraries, so be sure to read the changelog for further details.
As always, huge thanks to the many contributors who helped with this release.
Link to the official chat updated on 2020/04/28.