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Unreleased

  • Support OCaml 5.3 (@anmonteiro, #2800)
  • Fix: don't print all extension strings as quoted extensions (@anmonteiro, #2809)

3.13.0

  • Support module%ppx syntax (@anmonteiro, #2771)
  • Extend open to arbitrary module expression (@anmonteiro, #2773)
  • Wrap let lazy patterns = .. in parentheses (let lazy(patterns) = ..) (@anmonteiro, #2774)
  • Print poly variants as normal variansts (@Sander Spies, #2708)
  • Improve printing of anonymous function return type (@Sander Spies, #2686)
  • Improve printing of destructuring with local open (@Sander Spies, #2684).
  • Parse and print attributes in binding let ops (@anmonteiro, #2777).
  • Parse polymorphic variants starting with [| (@anmonteiro, #2781)
  • Always add a line break in records with 2 or more fields (@anmonteiro, #2779)
  • Always break nonempty doc comments after */ (@anmonteiro, #2780)
  • Improve printing of arrows with labelled arguments (@anmonteiro, #2778)
  • Parse and print extensions in open%foo expressions and structure items (@anmonteiro, #2784)
  • Add support for module type substitutions (@anmonteiro, #2785)
  • Support type%foo extension sugar syntax (@anmonteiro, #2790)
  • Support quoted extensions (@anmonteiro, #2794)
  • Parse universal type variables in signature items (@anmonteiro, #2797)
  • Fix formatting of callbacks with sequence expressions (@anmonteiro, #2799)
  • Fix printing of attributes on module expressions (@anmonteiro, #2803)

3.12.0

  • Add \u{hex-escape} syntax (@anmonteiro, #2738)
  • Support local open and let bindings (@SanderSpies) #2716
  • outcome printer: change the printing of @bs.* to @mel.* (@anmonteiro, #2755)
  • Fix outcome printing of optional arguments on OCaml 5.2 (@anmonteiro, #2753)
  • support parsing and printing of external%extension (@anmonteiro, #2750, #2766, #2767)
  • install refmt manpage (@anmonteiro, #2760)
  • add support for parsing / printing of refutation clause in switch (@anmonteiro, #2765)
  • support let%ppx in signatures (@anmonteiro, #2770)

3.11.0

  • Print structure items extension nodes correctly inside modules (@anmonteiro, #2723)
  • Print wrapped type constraint on record patterns (@anmonteiro, #2725)
  • Support OCaml 5.2 (@anmonteiro, #2734)

3.10.0

  • Support @mel.* attributes in addition to @bs.* (@anmonteiro, #2721)

3.9.0

  • Reduce the amount of parentheses around functor usage (@SanderSpies, #2683)
  • Print module type body on separate line (@SanderSpies, #2709)
  • Fix missing patterns around contraint pattern (a pattern with a type annotation).
  • Fix top level extension printing
  • Remove the dependency on the result package, which isn't needed for OCaml 4.03 and above (@anmonteiro) #2703
  • Fix the binary parser by converting to the internal AST version used by Reason (@anmonteiro) #2713
  • Port Reason to ppxlib (@anmonteiro, #2711)
  • Support OCaml 5.1 (@anmonteiro, #2714)

3.8.2

  • Fix magic numbers for OCaml 5.0 (@anmonteiro) #2671

3.8.1

  • (Internal) Rename: Reason_migrate_parsetree -> Reason_omp (@ManasJayanth) #2666
  • Add support for OCaml 5.0 (@EduardoRFS and @anmonteiro) #2667

3.8.0

  • Add support for OCaml 4.13 (@EduardoRFS and @anmonteiro) #2657
  • Add support for OCaml 4.14 (@EduardoRFS and @anmonteiro) #2662

3.7.0

  • Add support for (limited) interop between letop + OCaml upstream (@anmonteiro) #2624
  • Add support for OCaml 4.12 (@kit-ty-kate) #2635
  • Remove support for OCaml 4.02.3 (@anmonteiro) #2638

3.6.2

New Feature, Non Breaking:

  • Reason Syntax v4 [NEW-FEATURE-NON-BREAKING]: Angle Brackets Type Parameters (PARSING) (@jordwalke)[#2604][#2604]

Bug Fixes:

  • Fix printing of externals that happen to have newlines/quotes in them (@jordwalke)#2593
  • Fix parsing/printing of attributes on patterns (@jordwalke)#2592
  • Fix Windows CI (@ManasJayanth) #2611
  • Fix uncurry attribute on function application(@anmonteiro) #2566
  • Support OCaml 4.11 (@anmonteiro) #2582
  • Vendor ocaml-migrate-parsetree for greater compatibility (@jordwalke) #2623

Docs:

  • README Reason logo (@iamdarshshah)[#2609][#2609]

3.6.0

New Feature, Non Breaking:

  • External syntax: make the external ... = "" part optional (@romanschejbal)#2464
    • external myFn: (string) => unit; is now equivalent to external myFn: (string) => unit = "";

Bug Fixes:

  • Fixes issues where method and similar keywords will be transformed to method_ (@cristianoc) #2530

3.5.4

Fixes:

  • Fix regression where keywords were not renamed correctly (@cristianoc) #2520
  • Fix regression where quoted object attributes / labeled arguments weren't renamed correctly (@anmonteiro) #2509
  • Fix issue where JSX braces break into multiple lines (@anmonteiro) #2503

Others:

  • Improve bspacks process for 4.06 and add esy workflow for building refmt.js

3.5.3

3.5.2

  • Support OCaml 4.09 (2450).
  • Improve opam packaging config (2431).
  • Improve repo to support esy resolutions to master branch (31225fc0

3.5.0

Improvements:

  • Support OCaml 4.08 (2426).

Fixes:

  • Print attributes in class fields 2414.
  • Preserve function body braces when Pexp_fun is an argument to a function commit
  • Prettify try to hug braces 2378
  • Fix operator swap for type declarations commit
  • Fix JSX removing semicolons commit
  • Better formatting of Pexp_lazy commit

3.4.2

Not released to @esy-ocaml/reason - would have required a major version bump. These features will be released in 3.5.0.

Improvements:

  • Parse and print parentheses around inline record declarations (2363)
  • Proper outcome printing (for editor and build) of inline records (2336)
  • Proper outcome printing of types with inline records (parentheses) (2370)

3.4.1

Fixes:

  • Don't remove semis in blocks inside ternary expressions as jsx children (2352).
  • Handle single line comments ending with end-of-file (2353).

3.4.0

Fixes:

  • Don't pun record types if they contain attributes (2316).

Improvements:

  • // line comments! (2268). Make sure that your constraints on refmt versions for native projects. Specify a version >= 3.4.0 if you use // comments in your Reason code. Specifiy ranges like 3.4.0-3.5.0.
  • Better whitespace interleaving (1990).
  • Allow Reason to be used with Merlin Natively on Windows (2256).
  • Improved Ternary Formatting (2294).

3.3.4

Fixes:

  • Pipe first braces (2133, 2148).
  • Better rtop use directives (2146, 2147).
  • foo(~Foo.a) becoming foo(~Fooa=Foo.a) (2136).
  • Parse <div> ...c</div> correctly (2137).
  • Invalid formatting of first-class module with type constraint (2151).
  • Precedence printing of pipe first with underscore sugar as JSX child (2159).
  • Correct location for JSX name & extension expression (2166, 2162).
  • Lack of space after module type of (2175).
  • Outcome printer (editor & interface generator) function signature (2185).
  • Precedence issue with unary operators and labeled arguments (2201).
  • Type printing of polymorphic variants row fields (2191).
  • Pattern parsing inside ternary expressions (2188).

Improvements:

  • Preserve empty lines in records and bs objects (2152).
  • Make let not = blabla work (not is a keyword) (2197).
  • Format doc comments on variant leafs with consistency (2194)
  • Single pipe first printing layout (2193).
  • Performance. One case where the printer took exponential time (2195).

3.3.3

  • More fixes for pipe first (2120, 2119, 2111).
  • Fix regressed printing of first-class module (2124).
  • Fix local open printing for bs.obj (2123).
  • fix printing of foo[(bar + 1)] to foo[bar + 1] (2110).
  • Only wrap fun in parentheses when necessary (2033).
  • Change all precedence printing to braces for consistency inside JSX (2106).
  • Format docblock comments above std attrs on record rows (2105).

3.3.2

Big release! No breaking change. Big shout out to @anmonteiro and @iwanKaramazow!

Major:

Others:

  • Parentheses hugging for multi-line Js.t({foo: bar}) (2074).
  • Correctly parse prefix ops in labeled parameters (2071).
  • Attach doc attributes before extension sugar (2069).
  • Support non-parenthesized label colon type equal optional in type declarations (2058).
  • Printf uncurried application when last argument is a callback (2064).
  • OCaml rtop syntax printing( 2031).
  • Fix Bigarray syntax (2045).
  • Parse M.[] (2043).
  • Fix printing of polymorphic variant with annotation (2019).
  • Format GADT type variants better (2016).
  • Better autocomplete for Merlin (1998).
  • Print newline after doc comments before attributes (1869).
  • Fix inconsistent printing of opening extension expressions (1979).
  • Fix error when parsing let x=-.1; and others (1945).
  • Arguments no longer accidentally punned when they carry attributes (1955).

3.2.0

See the blog post here.

  • WHITESPACES IMPROVEMENTS ARE HERE: empty lines between most things will now be preserved when you format your code! Multiple lines still collapse to one line in most cases (1921, 1919, 1876).
  • Semicolon relaxation: see blog post (1887).
  • Fix parsing & printing of es6 function syntax inside attributes (1943).
  • List spread now has better error (1925).
  • Functor in JSX tags (1927).
  • Better comment printing (1940, 1934).
  • Various other printer improvements.

3.1.0

  • New pipe sugar for function call argument in arbitrary position: foo |> map(_, addOne) |> filter(_, isEven) (1804).
  • BuckleScript [@bs] uncurry sugar: [@bs] foo(bar, baz) is now foo(. bar, baz). Same for declaration (1803, 1832).
  • Trailing commas for record, list, array, and everything else (1775, 1821)!
  • Better comments interleaving (1769, 1770, 1817)
  • Better JSX printing: <Foo bar=<Baz />>, <div><span></span></div> (1745, 1762).
  • switch now mandates parentheses around the value. Non-breaking, as we currently support parentheses-less syntax but print parens (1720, 1733).
  • Attributes on open expressions (1833).
  • Better OCaml 4.06 support (1709).
  • Extension points sugar: let%foo a = 1 (1703)!
  • Final expression in a function body now also has semicolon. Easier to add new expressions afterward now (1693)!
  • Better editor printing (outcome printer) of Js.t object types, @bs types, unary variants and infix operators (1688, 1784, 1831).
  • Parser doesn't throw Location.Error anymore; easier exception handling when refmt is used programmatically (1695).

3.0.4

  • Default print width is now changed from 100 to 80 (1675).
  • Much better callback formatting (1664)!
  • Single argument function doesn't require wrapping the argument with parentheses anymore (1692).
  • Printer more lenient when user writes [%bs.obj {"foo": bar}]. Probably a confusion with just {"foo": bar} (1659).
  • Better formatting for variants constructors with attributes (1668, 1677).
  • Fix exponentiation operator printing associativity (1678).

3.0.2

  • JSX: fix most of the parsing errors (#856 #904 1181 1263 1292)!! Thanks @IwanKaramazow!
  • In-editor syntax error messages are now fixed! They should be as good as the terminal ones (1654).
  • Polymorphic variants can now parse and print `foo(()) as `foo() (1560).
  • Variant values with annotations like Some((x: string)) can now be Some(x: string) (1576).
  • Remove few places remaining that accidentally print fun for functions (1588).
  • Better record & object printing (1593, 1596).
  • Fewer unnecessary wrappings in type declarations and negative constants (1616, 1634).
  • Parse and print attributes on object type rows (1637).
  • Better printing of externals with attributes (1640).
  • Better printing for multiple type equations in a module type in a function argument (1641).
  • Better printing for unary -. in labeled argument (1642).

3.0.0

Our biggest release! Please see our blog post on https://reasonml.github.io/blog/2017/10/27/reason3.html.

Summary: this is, practically speaking, a non-breaking change. You can mix and match two projects with different syntax versions in BuckleScript 2 (which just got release too! Go check), and they'll Just Work (tm).

To upgrade your own project, we've released a script, https://github.com/reasonml/upgradeSyntaxFrom2To3

Improvements:

  • Much better printing for most common idioms.
  • Even better infix operators formatting for ==, &&, > and the rest (1380, 1386, etc.).
  • More predictable keyword swapping behavior (1539).
  • BuckleScript's Js.t {. foo: bar} now formats to {. "foo": bar}, just like its value counterpart ([%bs.obj {foo: 1}] to {"foo": bar}.
  • [@foo], [@@foo] and [@@@foo] are now unified into [@foo] and placed in front instead of at the back.
  • ! is now the logical negation. It was not previously.
  • Dereference was !. Now it's a postfix ^.
  • Labeled argument with type now has punning!
  • String concat is now ++ instead of the old ^.
  • For native, Reason now works on OCaml 4.05 and the latest topkg (1438).
  • Record field punning for module field prefix now prints well too: {M.x, y} is {M.x: x, y: y}.
  • JSX needs {} like in JS.
  • Fix reason-specific keywords printing in interface files (e.g. ==, match, method).
  • Record punning with renaming (1517).
  • The combination of function label renaming + type annotation + punning is now supported!
  • Label is now changed from ::foo back to ~foo, just like for OCaml.
  • Fix LOTS of bugs regarding parsing & formatting (closing around 100 improvement-related issues!).
  • Official refmt.js, with public API. See README.md.
  • Official refmt native public API too.
  • New JS application/abstraction syntax. Yes yes, we know. Despite the 100+ fixes, this one's all you cared about. Modern software engineering ¯\_(ツ)_/¯. Please do read the blog post though.

Breaking Changes:

  • Remove --use-stdin and --is-interface-pp option from refmt; they've been deprecated for a long time now
  • Remove unused binaries: reup, etc.
  • Remove the old reactjs_jsx_ppx.ml. You've all been on reactjs_jsx_ppx_2.ml for a long time now.
  • Reserved keywords can no longer be used as an external declaration's labels.

Deprecated:

  • Deprecate --add-printers option from refmt; we'll have a better strategy soon.

1.13.7

  • Much better infix operators (e.g. |>) formatting! (1259)
  • Official refmt.js, with public API. See README.md. We've back-ported this into the 1.13.7 release =)

1.13.6

  • Changelog got sent into a black hole