Owner

gren-lang

10 indexed repositories · View on GitHub

compiler
Compiler for the Gren programming language

Haskell · 503 stars
core
Gren's core package

JavaScript · 48 stars
book
The Gren Programming Language Book

MDX · 34 stars
gren-lang.github.io
The official website of the Gren programming language

Elm · 20 stars
node
Run Gren on NodeJS

JavaScript · 13 stars
browser
Run Gren in the browser

JavaScript · 3 stars
compiler-node
Node specific implementation of Gren compiler

JavaScript · 2 stars
package.gren-lang.org
The server backing package.gren-lang.org

JavaScript · 1 star
compiler-common
Common functionality of the Gren compiler

1 star
registry
New Gren package registry

Shell · 0 stars

Beginner friendly Everything

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`compiler-common` rejects names that `gren make` compiles: `x中`, `xʰ`, `xǅ` and `ǅa` Open

bug

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

gren-lang/compiler-common#38 · Opened Sep 14, 2026
`Bytes.toString` drops a leading U+FEFF, so a string does not survive `fromString` and back Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

gren-lang/core#155 · Opened Sep 14, 2026
`Bytes.Decode.bytes` reads past the end of the `Bytes` it is decoding Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

gren-lang/core#154 · Opened Sep 14, 2026
A `Bytes` value crossing a port carries its whole backing buffer, not the bytes it holds Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

gren-lang/core#153 · Opened Sep 14, 2026
A decoder that uses `Bytes.Decode.fail` crashes instead of returning `Nothing` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

gren-lang/core#152 · Opened Sep 14, 2026
Backfill packages from old site Open

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

gren-lang/registry#44 · Opened Sep 13, 2026
`String.words` of a string with no words in it returns a 1-member Array instead of an empty Array Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

gren-lang/core#151 · Opened Sep 13, 2026
`firstIndexOf` can return an index that `slice` cannot use: what it found is half a character Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

gren-lang/core#150 · Opened Sep 12, 2026
`Char.fromCode` throws a `RangeError` out of range, but its documentation says it returns U+FFFD Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

gren-lang/core#149 · Opened Sep 12, 2026
firstIndexOf, lastIndexOf and indices return UTF-16 offsets, which no other String function accepts Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

gren-lang/core#148 · Opened Sep 12, 2026
`FileSystem.FileHandle.writeFromOffset` ignores its offset and writes at position 0 Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

gren-lang/node#63 · Opened Sep 11, 2026
`Random.int` uses its range modulo 2^32: wide ranges silently narrow, and 2^32 + 1 returns the low end of its range forever Open

bug

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

gren-lang/core#147 · Opened Sep 11, 2026
`Random` 's PCG algorithm is incorrect: `peel`'s multiply overflows float64 Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

gren-lang/core#146 · Opened Sep 11, 2026
Output to STDOUT blocks reporting to STDERR Open

bug good first issue

Difficulty 3/5 1-2 days Newbie friendliness 68/100

gren-lang/compiler#388 · 1 comment · Opened Sep 8, 2026
`String.Parser.keyword` treats every non-ASCII letter as a word boundary; compiler-common's parser thus disagrees with the Haskell-based parser Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

gren-lang/core#144 · Opened Sep 7, 2026
A port's definition can be emitted before the kernel code it calls Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

gren-lang/compiler#387 · Opened Sep 6, 2026
`compare` on `String` orders UTF-16 code units, not characters Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

gren-lang/core#143 · 2 comments · Opened Sep 6, 2026
An exception raised after a stream write is swallowed, and the scheduler stops for good Open

bug

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

gren-lang/core#142 · Opened Sep 5, 2026
`remainderBy 0` puts `NaN` in an `Int`, while its sibling `modBy 0` kills the program Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

gren-lang/core#141 · 1 comment · Opened Sep 5, 2026
`^` with a negative exponent puts `0.5` and `Infinity` into an `Int` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

gren-lang/core#140 · Opened Sep 5, 2026
`compare` on floats is not an order, and a NaN key makes `Dict` lose entries it still lists Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

gren-lang/core#139 · Opened Sep 5, 2026
A node program that crashes exits with status 0 Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

gren-lang/compiler#385 · Opened Sep 5, 2026
`chompIf` / `chompWhile` hand the predicate half a surrogate pair Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

gren-lang/core#138 · Opened Sep 3, 2026
`\u{FFFF}` in a string literal produces the wrong result for a couple different reasons Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

gren-lang/compiler#384 · Opened Sep 3, 2026
`//` truncates its result to 32 bits when inlined, but not when passed as a function Open

bug good first issue

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

gren-lang/compiler#383 · 1 comment · Opened Aug 31, 2026
A top-level declaration is accepted at any column; the Haskell-based compiler requires column 1 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

gren-lang/compiler-common#37 · Opened Aug 22, 2026
Bytes.flatten reads each input from offset 0 of its backing buffer even when it shouldn't Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

gren-lang/core#137 · 1 comment · Opened Aug 16, 2026
HttpClient.withBytesBody ignores byteOffset/byteLength and sends the whole backing buffer Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

gren-lang/node#57 · Opened Aug 16, 2026
_Scheduler_step re-enters parked bindings, corrupting effect manager state ; crash happens Open

bug

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

gren-lang/core#136 · Opened Aug 16, 2026
hexFolder returns the wrong value for 27 exactly-representable hex literals near 2^53 Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

gren-lang/compiler-common#36 · Opened Aug 11, 2026
A binops minus sign ("-") split across rows is parsed as negation when the right operand happens to start at the column immediately after the minus sign Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

gren-lang/compiler-common#35 · Opened Aug 4, 2026
Expand the recording of the original string for some literals Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

gren-lang/compiler-common#34 · Opened Aug 2, 2026
Parser accepts custom-type variants with more than one bare-constructor argument Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

gren-lang/compiler-common#32 · Opened Jul 19, 2026
`gren package validate` should validate CHANGELOG entry Open

enhancement

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

gren-lang/compiler#382 · Opened Jul 18, 2026
Compiler optimizing out unreferenced ports causes unexpected errors Open

bug enhancement

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

gren-lang/compiler#381 · Opened Jul 16, 2026
Revoke a package/version Open

enhancement

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

gren-lang/registry#42 · Opened Jul 15, 2026
Permissions in a publishing identity Open

enhancement

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

gren-lang/registry#41 · Opened Jul 15, 2026
Add or remove additional users to a publishing identity Open

enhancement

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

gren-lang/registry#40 · Opened Jul 15, 2026
new parser fails to parse a constructor-application pattern aliased with "as" Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

gren-lang/compiler-common#31 · Opened Jul 12, 2026
New parser: A variable name starting with "as" is okay as the 1st variable in a function but not the 2nd. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

gren-lang/compiler-common#30 · Opened Jul 1, 2026
Haskell-based compiler 0.6.5 crashes when compiling a package that has a summary field >= 80 chars Open

bug good first issue help wanted

Difficulty 3/5 1-2 days Newbie friendliness 55/100

gren-lang/compiler#380 · Opened Jun 28, 2026
Sqlite: Packages need a safe way to compose transactions without nested transaction errors Open

enhancement

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

gren-lang/node#51 · 1 comment · Opened Jun 13, 2026
`Bytes` field in record becomes undefined when used as `Flags` Open

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

gren-lang/compiler#376 · Opened Jun 8, 2026
Parser misparses postfix record access after parens, record literals, record updates, and qualified variables Open

bug

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

gren-lang/compiler-common#27 · 2 comments · Opened Jun 6, 2026
Discussion: formatting options Open

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

gren-lang/compiler#374 · 5 comments · Opened May 27, 2026
The wrong row number is assigned to "import", "type", "type alias", and "port" in the AST Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

gren-lang/compiler-common#25 · Opened May 26, 2026
The new gren-based parser cannot handle block comments in some places Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

gren-lang/compiler-common#23 · 2 comments · Opened May 22, 2026
Custom platforms Open

language proposal

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

gren-lang/compiler#373 · 1 reaction · Opened May 20, 2026
Getting rid of effect modules and ports Open

language proposal

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

gren-lang/compiler#372 · Opened May 19, 2026
Transparent tasks and commands Open

language proposal

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

gren-lang/compiler#371 · Opened May 19, 2026

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