v6.0.0

What's Changed

Breaking Changes

• Separate line and block comments into distinct node types (#271) — line_comment and block_comment are now separate named AST nodes instead of a single comment node. Queries and tooling that match (comment) must be updated.

New Features

• Dict syntax support — added dict{…} constructor, dict value access, and dict keyword handling in the scanner (#260, #274)
• Regex literal parsing — regex expressions are now parsed as first-class nodes (#265)
• Nested types (ReScript v12) — support for nested module types (#264)
• Exponentiation operator ** — parsed as right-associative (#279)
• Array spreads, variant type spreads, and newer operators (#267)
• Explicit partial application syntax (f(a, ...)) (#239)
• Record type spread — {...t, field: type} in type positions
• Dynamic module import — import expressions
• Optional fields in record patterns — {field?: value}
• Aliased inline types and better support for aliased types (#239)
• Generic and polymorphic types in coercion expressions (#273)
• Separate named node for type spreads (#239)
• GraphQL injection for rescript-relay — language injection for %relay(…) nodes
• Decorator moved to scanner — more robust decorator parsing (#218)
• Variant ? prefix — nullable variant constructor support
• Pattern type annotation — patterns can carry type annotations
• include statement improvements — broader expression support (#206)
• try expression — allows arbitrary expressions in try bodies (#204)
• Module paths in member_expression (#248)

Bug Fixes

• Fix and keyword recognition in scanner (#229)
• Fix block comment not recognized inside switch expressions (#275)
• Fix multiple consecutive block comments in switch expressions (#275)
• Fix module_unpack to allow type annotation on call expressions (#270)
• Fix module type parsing (#266)
• Fix else / else if parsing when on a new line after closing brace (#262)
• Fix JSX element inside pipe expression (#239)
• Fix generic type spread (#239)
• Fix infinite loop in scanner (#226)
• Fix lazy pattern (#226)
• Fix functor parsing (#223)
• Fix empty char literal (#208)
• Fix negative decimal integer literal (#253)
• Fix injections
• Remove redundant seq call (#253)
• Allow unpack as a valid identifier (#201)
• Hex literal and decimal number improvements (#212)

Highlighting

• Highlight fixes (#241)
• Dict syntax highlighting
• Fix highlighting regressions

Infrastructure

• Bump tree-sitter to 0.26.8 (#276)
• Update tree-sitter to 0.25.2 (#257)
• Add playground publish pipeline (#261)
• Fix playground build and deploy (#280, #281)
• Update CI configuration (#258, #278)
• Include parser.c and generated files in repository (#240, #245, #277)

New Contributors

• @Emilios1995 made their first contribution in #239
• @cristianoc made their first contribution in #232
• @FreddieGilbraith made their first contribution in #245
• @CarlOlson made their first contribution in #248
• @ribru17 made their first contribution in #253
• @nojaf made their first contribution in #261
• @shulhi made their first contribution in #266
• @lungarella-raffaele made their first contribution in #265
• @mvaled made their first contribution in #267

Full Changelog: v5.0.0...v6.0.0