• Fix for super optional args, downcase / upcase string methods [#215]

• Many filters and other project features deprecated for future maintainability (see blog announcement).
• The Vite and Rollup JS packages are looking for a new maintainer. Please let us know in the community GitHub Discussions if you'd like to contribute.
• The Node version of Ruby2JS will require minimum version 14
• Create a preset option to set sane default behavior [#178]
• New configuration DSL and per-file magic comments [#182]
• esbuild: change to use Ruby platform for Ruby2JS compilation [#183]
• fix haml filter and update spec to include interpolation [#198]

Fixed

• Revert back to Opal 1.1.1 for compilation
  Any newer version of Opal results in compilation errors when emoji (and perhaps other unicode chars) are present in code
• Ensure Nokogiri filter's create_element uses textContent instead of content

Added

• Support for Ruby 3.1's shorthand hash syntax: hash => {a:, b:} => let {a, b} = hash
• functions filter: chars
• functions filter: "string" * length => "string".repeat(length) for ES2015+

Changed

• Improvements to the monorepo to ensure both the Ruby and the Node compiler versions always match
  and can get tested and released simultaneously. (Run bundle exec rake release_core.)
• Ruby 2.7 is now the minimum supported version of Ruby.

Changes since 4.2.1:

• functions filter: index, rindex, and round
• functions filter: obj.to_json => JSON.stringify(obj)
• support numbered parameters (numblocks)
• Array.new(size, default) => new Array(size).fill(default)

• Additional lit filter updates (PR #141)
  • Allow snake case custom_element in addition to customElement
  • Process the render function even when it contains multiple statements
  • Fix a properties vs styles typo for <es2022
  • Automatically add the html tagged literal return when necessary for any method, not just render
  • Ensure any ivars prefixed with _ will not turn into reactive properties (if you truly need to maintain private internal state).
• ruby2js cli interface added
• esm autoimports & defs: fix Opal-based parser to handle hash generated by Ruby
• esm filter: convert top level requires into imports
• lit filter: updates from polymer LitElement to Lit v2.
  added: customElements, es2022 syntax for properties,
  query, queryAll, queryAsync
  inherited methods: performUpdate, requestUpdate
  inherited properties: hasUpdated, renderRoot, shadowRoot, updateComplete

Changes since v4.1.6:

• take, drop, min, max, each_slice added to underscore filter
• import stimulus => import @hotwired/stimulus
• rails stimulus rake tasks and instructions were updated to match
  the latest hotwired/stimulus-rails changes

• Add camelCase support for keyword arguments (aka destructured object arg)

Changes since 4.1.2:

• Add camelCase support for => assignment operator
• Fix bugs related to is_a? and instance_of?

See what else is new since 4.0.0 in the Changelog.

Changes since v3.6.1

• Support static method calls with blocks in es2015+
• Auto-bind instance methods referenced as properties within a class
• New defs option to add definitions for autoimported classes/methods
• Open classes/modules, inheritance, and module include of props/methods
• Handle begin, if, and case as expressions
• Handle modules with exactly one method
• Handle empty edge cases like `#{}` and ()
• Live demo based on Opal (see here)
• Demo: Hidden AST syntax enables copy/paste of syntactically correct AST
• Anonymous classes via Class.new
• Autoexport :default option
• Support both default and named imports on same import statement
• requires for modules containing exports statements generate import statements
• require_recursive option