reasonml/reason

View on GitHub

Simple, fast & type safe code that leverages the JavaScript & OCaml ecosystems

Stars: 10.3k
Forks: 438
Open beginner issues: 0
Indexed issues: 167

Dominant language: OCaml
License: MIT
Last GitHub push: Aug 12, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

Open All

167 open issues indexed

Qualified first type argument after `<` is parsed as `Lident` instead of `Ldot` Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

reasonml/reason#2943 · Opened Sep 13, 2026
`refmt` rewrites valid code into code that doesn't compile Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

reasonml/reason#2925 · 1 comment · Opened Jul 24, 2026
Update `Reason_oprint` functions to use `Format_doc` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2871 · Opened Oct 5, 2025
[Formatting] Record formatting improvements Open

Printer

Difficulty 4/5 3-5 days Newbie friendliness 42/100

reasonml/reason#2843 · Opened May 19, 2025
Support Ptyp_open Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

reasonml/reason#2837 · Opened Feb 23, 2025
Doc comments don't appear in IDE Open

Editor support

Difficulty 4/5 3-5 days Newbie friendliness 30/100

reasonml/reason#2815 · 2 comments · 4 reactions · Opened Nov 28, 2024
"module type of" needs parentheses Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

reasonml/reason#2801 · Opened Sep 16, 2024
outcome printer: `test/class.t` tests show failure Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

reasonml/reason#2756 · Opened Jul 8, 2024
Refmt doesn't break the line when an extra long string occurs in switch branch Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

reasonml/reason#2727 · Opened Oct 16, 2023
Attributes and other expressions add single space as identation Open

Printer

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2675 · 1 comment · Opened Nov 12, 2022
v4 syntax TODO Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

reasonml/reason#2672 · 28 reactions · Opened Sep 30, 2022
Inlined functions look wrongly formatted Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2669 · 2 comments · 1 reaction · Opened Jun 21, 2022
Error recovery for letops Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2668 · 4 comments · Opened Jun 16, 2022
refmt removes unremovable parentheses Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2653 · Opened Apr 16, 2021
GADT code in OCaml Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

reasonml/reason#2642 · 1 reaction · Opened Dec 8, 2020
String template literals: Additional Features Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

reasonml/reason#2603 · 15 comments · 3 reactions · Opened Jul 10, 2020
Record completion issue with merlin Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2597 · 1 comment · 3 reactions · Opened Jul 1, 2020
Long refmt run time with a stack overflow on a file with a bunch of modules Open

Printer

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2594 · 1 comment · 1 reaction · Opened Jun 18, 2020
`bs` and `bs.obj` ppx apply deeply Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2584 · 1 comment · Opened Jun 1, 2020
`++` operator is right associativity Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

reasonml/reason#2577 · 5 comments · 1 reaction · Opened May 16, 2020
Unify name mangling rules Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

reasonml/reason#2574 · 7 comments · 3 reactions · Opened May 14, 2020
refmt produces invalid code in JSX with fast pipe and field access Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2573 · 3 comments · Opened May 10, 2020
Support for props spread Open

RFC

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2570 · 2 reactions · Opened May 5, 2020
desugaring of `obj->f(.a,b)` is confusing Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2569 · Opened May 5, 2020
Js.t obj type in external gets aligned wrong for named args Open

Printer

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2562 · Opened Apr 9, 2020
Broken indentation within extension point when used with `include` Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 45/100

reasonml/reason#2555 · 1 reaction · Opened Mar 27, 2020
Regression: escaping of "method" breaks JS interop Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2523 · 16 comments · 4 reactions · Opened Dec 20, 2019
feature enhancement: less parens when deal with anonymous module Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2516 · 1 comment · Opened Dec 12, 2019
Incorrect message about unbalanced parentheses in BS7 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2514 · 1 comment · Opened Dec 12, 2019
Doc comment in switch causes parse failure Open

Parser

Difficulty 3/5 1-2 days Newbie friendliness 38/100

reasonml/reason#2501 · Opened Nov 26, 2019
Underscore application with infix operator produces invalid syntax with refmt Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 48/100

reasonml/reason#2492 · 3 reactions · Opened Nov 15, 2019
Underscore application doesn't work with indexing syntax Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2489 · 1 reaction · Opened Nov 11, 2019
Implicit blocks for else. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

reasonml/reason#2477 · 9 comments · Opened Oct 28, 2019
JSX syntax error - two self-closing elements with no space between Open

Parser

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2470 · Opened Oct 17, 2019
Syntax sugar for (immutably) modifying js-objects Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

reasonml/reason#2467 · 2 comments · 1 reaction · Opened Oct 14, 2019
refmt: keep new line characters when using infix operators Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 35/100

reasonml/reason#2465 · 1 comment · 3 reactions · Opened Oct 10, 2019
[refmt]: unknown error at "fun%expr" within "switch" Open

Printer

Difficulty 4/5 3-5 days Newbie friendliness 38/100

reasonml/reason#2449 · 1 comment · Opened Sep 17, 2019
Invalid code generated from valid OCaml interface code Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 45/100

reasonml/reason#2445 · 5 comments · Opened Sep 1, 2019
comment not preserved 100% Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

reasonml/reason#2443 · 3 comments · Opened Aug 14, 2019
add -o flag to refmt command line Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

reasonml/reason#2438 · 2 comments · Opened Aug 5, 2019
Custom indexing operator syntax Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2432 · 1 reaction · Opened Jul 20, 2019
JSX elements produce different locations depending on component casing Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

reasonml/reason#2427 · Opened Jun 16, 2019
[refmt] Weird formatting of record member access following function call Open

Printer

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2424 · 1 reaction · Opened Jun 15, 2019
"/" still needs to be escaped in custom operators Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

reasonml/reason#2420 · 1 reaction · Opened Jun 7, 2019
Incorrect parsing of ocamldoc, module doc gets attached to first declaration Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2419 · 9 comments · 4 reactions · Opened Jun 7, 2019
Reason fails to parse get->[a, y]; Open

Parser

Difficulty 4/5 3-5 days Newbie friendliness 38/100

reasonml/reason#2417 · Opened Jun 5, 2019
Infix operators spacing inconsistency Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

reasonml/reason#2408 · 1 comment · Opened May 9, 2019
Change indendtation of functions with many arguments Open

Printer

Difficulty 3/5 1-2 days Newbie friendliness 45/100

reasonml/reason#2398 · 5 reactions · Opened Apr 29, 2019
Bug: Parsing of tuples and lambdas dependent on parens. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

reasonml/reason#2397 · 1 comment · Opened Apr 28, 2019
Format Reason markdown comments at reformat time. Open

Printer

Difficulty 5/5 Over a week Newbie friendliness 35/100

reasonml/reason#2392 · 3 reactions · Opened Apr 21, 2019

reasonml/reason

Get new issues in your inbox