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3.0.6 (soon to be released)

  • 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).
  • 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