12.0.0-alpha.4

💥 Breaking Change

• OCaml compatibility in the stdlib and primitives are dropped/deprecated. #6984
• Remove JSX v3. #7072
• Remove js_cast.res. #7075

🚀 New Feature

• Use FORCE_COLOR environmental variable to force colorized output. #7033
• Allow spreads of variants in patterns (| ...someVariant as v => ) when the variant spread is a subtype of the variant matched on. #6721
• Fix the issue where dynamic imports are not working for function-defined externals. #7060
• Allow pattern matching on dicts. switch someDict { | dict{"one": 1} => Js.log("one is one") }. #7059
• "ReScript Core" standard library is now included in the rescript npm package. #7108 #7116
• Handle absolute filepaths in gentype. #7104

🐛 Bug fix

• Fix tuple coercion. #7024
• Fix attribute printing. #7025
• Fix "rescript format" with many files. #7081
• Fix bigint max, min. #7088
• Fix parsing issue with nested variant pattern type spreads. #7080
• Fix JSX settings inheritance: only 'version' propagates to dependencies, preserving their 'mode' and 'module'. #7094
• Fix variant cast to int. #7058
• Fix comments formatted away in function without arguments. #7095
• Fix genType JSX component compilation. #7107

💅 Polish

• Add some context to error message for unused variables. #7050
• Improve error message when passing children prop to a component that doesn't accept it. #7044
• Improve error messages for pattern matching on option vs non-option, and vice versa. #7035
• Improve bigint literal comparison. #7029
• Improve output of @variadic bindings. #7030
• Improve error messages around JSX components. #7038
• Improve output of record copying. #7043
• Provide additional context in error message when unit is expected. #7045
• Improve error message when passing an object where a record is expected. #7101

🏠 Internal

• Remove uncurried flag from bsb. #7049
• Build runtime/stdlib files with rescript/bsb instead of ninja.js. #7063
• Build tests with bsb and move them out of jscomp. #7068
• Run build_tests on Windows. #7065
• Rename folder "jscomp" to "compiler". #7086
• Disable -bs-cross-module-opt for tests. #7071
• Move ounit_tests into the tests folder. #7096
• Move syntax_tests into the tests folder. #7090 #7097
• Capitalize runtime filenames. #7110
• Build mocha tests as esmodule / .mjs. #7115

11.1.4

🐛 Bug Fix

• Fix issue where long layout break added a trailing comma in partial application .... #6949
• Fix incorrect format of function under unary operator. #6953
• Fix incorrect incorrect printing of module binding with signature. #6963
• Disallow spreading anything but regular variants inside of other variants. #6980
• Fix comment removed when function signature has type keyword. #6997
• Fix parse error on doc comment before "and" in type def. #7001
• Fix tuple coercion. #7024

12.0.0-alpha.3

🐛 Bug fix

• Revert "Throws an instance of JavaScript's new Error() and adds the extension payload for cause option" (#6611). #7016
• Fix dict literals error. #7019

12.0.0-alpha.2

🚀 New Feature

• Allow coercing polyvariants to variants when we can guarantee that the runtime representation matches. #6981
• Add new dict literal syntax (dict{"foo": "bar"}). #6774
• Optimize usage of the new dict literal syntax to emit an actual JS object literal. #6538

🐛 Bug Fix

• Fix issue where long layout break added a trailing comma in partial application .... #6949
• Fix incorrect format of function under unary operator. #6953
• Fix incorrect printing of module binding with signature. #6963
• Fix incorrect printing of external with @as attribute and _ placholder (fixed argument). #6970
• Disallow spreading anything but regular variants inside of other variants. #6980
• Fix comment removed when function signature has type keyword. #6997
• Fix parse error on doc comment before "and" in type def. #7001

🏠 Internal

• Add dev container. #6962
• Convert more tests to the node test runner. #6956
• Remove attribute "internal.arity". #7004
• Remove dead modules. #7008

💅 Polish

• Improve formatting in the generated js code. #6932
  • }\ncatch{ -> } catch {
  • for(let i = 0 ,i_finish = r.length; i < i_finish; ++i){ -> for (let i = 0, i_finish = r.length; i < i_finish; ++i) {
  • while(true) { -> while (true) {
  • Fixed tabulation for switch case bodies
  • Fixed tabulation for throw new Error bodies
  • Removed empty line at the end of switch statement
  • Removed empty default case from switch statement in the generated code
• Optimised the Type Extension runtime code and removed trailing /1 from RE_EXN_ID. #6958
• Compact output for anonymous functions. #6945 #7013
• Rewatch 1.0.9. #7010

12.0.0-alpha.1

🚀 New Feature

• Allow @directive on functions for emitting function level directive code (let serverAction = @directive("'use server'") (~name) => {...}). #6756
• Add rewatch to the npm package as an alternative build tool. #6762
• Throws an instance of JavaScript's new Error() and adds the extension payload for cause option. #6611
• Allow free vars in types for type coercion e :> t. #6828
• Allow private in with constraints. #6843
• Add regex literals as syntax sugar for @bs.re. #6776
• Improved mechanism to determine arity of externals, which is consistent however the type is written. #6874 #6881 #6883

💥 Breaking Change

• Make j and js allowed names for tag functions. #6817
• lazy syntax is no longer supported. If you're using it, use Lazy module or React.lazy_ instead. #6342
• Remove handling of attributes with bs. prefix (@bs.as -> @as etc.). #6643
• Remove obsolete @bs.open feature. #6629
• Drop Node.js version <18 support, due to it reaching End-of-Life. #6429
• Remove deprecated -bs-super-errors option. #6814
• Some global names and old keywords are no longer prefixed. #6831
• Remove ml parsing tests and conversion from .ml to .res via format. #6848
• Remove support for compiling .ml files, and general cleanup. #6852
• Remove rescript convert subcommand. #6860
• Remove support for @bs.send.pipe. This also removes all functions in Js_typed_array that rely on @bs.send.pipe. #6858 #6891
• Remove deprecated Js.Vector and Js.List. #6900

🐛 Bug Fix

• Fix unhandled cases for exotic idents (allow to use exotic PascalCased identifiers for types). #6777 #6779 #6897
• Fix unused attribute check for @as. #6795
• Reactivate unused attribute check for @int. #6802
• Fix issue where using partial application ... can generate code that uses Curry at runtime. #6872
• Avoid generation of Curry with reverse application |>. #6876
• Fix issue where the internal ppx for pipe -> would not use uncurried application in uncurried mode. #6878

🏠 Internal

• Build with OCaml 5.2.0. #6797
• Convert OCaml codebase to snake case style. #6702
• Fix -nostdlib internal compiler option. #6824
• Remove a number of ast nodes never populated by the .res parser, and resulting dead code. #6830
• Remove coercion with 2 types from internal representation. Coercion e : t1 :> t2 was only supported in .ml syntax and never by the .res parser. #6829
• Convert caml_format and js_math to .res. #6834
• Convert js.ml files to .res. #6835
• Remove old .ml tests. #6847
• Make compiler libs ready for uncurried mode. #6861
• Make tests ready for uncurried mode. #6862
• Make gentype tests uncurried. #6866
• Remove @@uncurried.swap, which was used for internal tests. #6875
• Build the compiler libraries/tests in uncurried mode. #6864
• Ignore -uncurried command-line flag. #6885
• Cleanup: remove tracking of uncurried state in parser/printer. #6888
• Remove %opaque primitive. #6892
• Reunify JsxC/JsxU -> Jsx etc. #6895
• Remove the transformation of foo(1,2) into Js.Internal.opaqueFullApply(Internal.opaque(f), 1, 2), and change the back-end to treat all applications as uncurried. #6893

💅 Polish

• Make the --help arg be prioritized in the CLI, so correctly prints help message and skip other commands. #6667
• Remove redundant space for empty return in generated js code. #6745
• Remove redundant space for export in generated js code. #6560
• Remove redundant space after continue in generated js code. #6743
• Remove empty export blocks in generated js code. #6744
• Fix indent for returned/thrown/wrapped in parentheses objects in generated js code. #6746
• Fix indent in generated js code. #6747
• In generated code, use let instead of var. #6102
• Turn off transformation for closures inside loops when capturing loop variables, now that let is emitted instead of var. #6480
• Improve unused attribute warning message. #6787
• Remove internal option use-stdlib from build schema. #6778
• Fix Js.Types.JSBigInt payload to use native bigint type. #6911
• Deprecate %external extension, which has never been officially introduced. #6906

11.1.3

🐛 Bug Fix

• Fix tag function location on compiler error. #6816
• Fix Deno compatibility issues on Windows. #6850
• Fix issue with infinite loops with type errors on recursive types. #6867
• Ignore @uncurry attribute in uncurried mode, to avoid generating calls to Curry at runtime. #6869
• Avoid generating calls to Curry when adjusting arity of uncurried functions. #6870
• Fix build after calling without -warn-error, see #6868 for more details. #6877
• Fix issue with uninitialized _param in recursive functions with unit argument. #6907

11.1.3-rc.1

🐛 Bug Fix

• Omit standard library dir from load path if -nostdlib is set. #6833

11.1.2

🐛 Bug Fix

• Fix issue where capitalised type variables were only allowed in certain positions. #6820

11.1.2-rc.1

🚀 New Feature

• Support Windows 11 ARM (using the x64 binaries in emulation). #6813

🐛 Bug Fix

• Fix location of let bindings with attributes. #6791
• PPX v4: mark props type in externals as @live to avoid dead code warnings for prop fields in the editor tooling. #6796
• Fix issue where optional labels were not taken into account when disambiguating record value construction. #6798
• Fix issue in gentype when type Jsx.element surfaces to the user. #6808
• Fix inclusion check (impl vs interface) for untagged variants, and fix the outcome printer to show tags. #6669
• Fix encoding inside tagged template literals. #6810

11.1.1

🐛 Bug Fix

• Fix issue of incorrect switch cases with identical bodies when mixing object and array. #6792
• Fix formatter eats comments on the first argument of a uncurried function. #6763
• Fix formatter removes parens in pipe operator with anonymous uncurried function. #6766