haskell/haskell-language-server

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Official Haskell IDE support via the language server protocol (LSP)

Stars: 3k
Forks: 455
Open beginner issues: 0
Indexed issues: 494
Avg merge: 2d 19h
Merged PRs (30d): 11

Dominant language: Haskell
License: Apache-2.0
Last GitHub push: Sep 12, 2026
Latest indexed: Sep 14, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Open All

494 open issues indexed

My pragmas keep shouting at me Open

component: ghcide component: hls-pragmas-plugin type: enhancement

haskell/haskell-language-server#729 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Error loading project with optional `packages` field missing in stack.yaml Open

build tool: stack can-workaround type: bug

haskell/haskell-language-server#511 · 9 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Eval Plugin cannot handle internal library imports Open

component: hls-eval-plugin multi-component type: bug

haskell/haskell-language-server#509 · 7 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Benchmark more kinds of configurations Open

CI component: ghcide performance type: enhancement

haskell/haskell-language-server#728 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Is it possible to not suggest different imports for the same thing Open

component: ghcide type: enhancement

haskell/haskell-language-server#531 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
hlint and CPP Open

can-workaround component: hls-hlint-plugin type: bug

haskell/haskell-language-server#554 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
too many clang/gcc processes, system limit reached Open

build tool: stack os: macos performance status: needs info type: bug

haskell/haskell-language-server#580 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Changes in hlint config file should be applied on the fly Open

component: hls-hlint-plugin type: enhancement

haskell/haskell-language-server#594 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 14, 2026
Running a test watcher alongside haskell-language-server Open

build tool: stack can-workaround type: bug

haskell/haskell-language-server#596 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add code action to suppress specific hlint warnings Open

component: hls-hlint-plugin Hackathon level: easy type: enhancement

haskell/haskell-language-server#600 · 7 comments · 13 reactions · 0 assignees · Indexed Sep 14, 2026
HLS adds type signature to TH declaration into wrong declaration group Open

component: ghcide type: bug

haskell/haskell-language-server#603 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Smarter import suggestion with defaults Open

component: ghcide type: enhancement

haskell/haskell-language-server#605 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Is it possible to change the "add to the import list of" message to look similar to other import messages Open

component: ghcide type: enhancement

haskell/haskell-language-server#626 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Automatic import of pattern synonyms does not import the correct name Open

component: ghcide Hackathon type: bug

haskell/haskell-language-server#627 · 10 comments · 4 reactions · 0 assignees · Indexed Sep 14, 2026
Make Fourmolu's use of editor 'tabSize' configurable Open

component: formatters type: enhancement

haskell/haskell-language-server#632 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add code-action to turn derived type-class into its implementation Open

component: hls-class-plugin type: enhancement

haskell/haskell-language-server#653 · 5 comments · 3 reactions · 0 assignees · Indexed Sep 14, 2026
CodeLens tries to rename module name to match the filename when the file is listed in the "main-is" section of the cabal file Open

component: hls-module-name-plugin level: easy type: bug type: enhancement

haskell/haskell-language-server#659 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Adding the PackageName/ComponentName on hover Open

component: ghcide type: enhancement

haskell/haskell-language-server#686 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Preprocessors support Open

component: ghcide type: enhancement

haskell/haskell-language-server#689 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Use stack/cabal cradle if no project config + ghc not in PATH + stack/cabal in PATH Open

component: hie-bios component: implicit-hie type: enhancement

haskell/haskell-language-server#692 · 13 comments · 7 reactions · 1 assignee · Indexed Sep 14, 2026
Add Qualified imports with types Open

component: imports plugin type: enhancement

haskell/haskell-language-server#697 · 6 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Detect stack elsewhere than the project root Open

build tool: stack can-workaround component: hie-bios level: hard status: needs info type: enhancement

haskell/haskell-language-server#1763 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Some unnecessary recompilations of boot modules Open

component: ghcide status: needs info type: bug

haskell/haskell-language-server#1174 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Run ghcide benchmark suite on HLS Open

performance type: enhancement

haskell/haskell-language-server#1201 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Plugin failures should not take down or make hang HLS Open

component: hls-eval-plugin component: plugins type: bug

haskell/haskell-language-server#1231 · 7 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
better error reporting for cradle failure (`stack setup --silent` case) Open

build tool: stack component: hie-bios status: blocked

haskell/haskell-language-server#1245 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
HLint config in subfolder not picked up Open

can-workaround component: hls-hlint-plugin type: bug

haskell/haskell-language-server#1260 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Conditionally built module are not loaded if Cabal disables them and stack.yaml reenables them with stack (revisit after commercialhaskell/stack#5480) Open

build tool: stack component: hie-bios status: blocked type: bug

haskell/haskell-language-server#1270 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Code action to remove redundant constraints can't deal with type operators properly Open

component: hls-refactor-plugin type: bug

haskell/haskell-language-server#1300 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Codelens: Not documented dependency on Prelude (NoImplicitPrelude EXT ON, causing it to output nothing) Open

component: hls-eval-plugin type: bug

haskell/haskell-language-server#1307 · 6 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Code action to add existing, unused pragma Open

component: hls-pragmas-plugin type: bug

haskell/haskell-language-server#1390 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Unable to load modules in haskell-language-server/plugins/default Open

component: ghcide component: implicit-hie status: needs info type: bug

haskell/haskell-language-server#1394 · 5 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Cabal mixins and custom preludes using stack Open

build tool: stack status: blocked type: bug

haskell/haskell-language-server#1415 · 9 comments · 7 reactions · 0 assignees · Indexed Sep 14, 2026
Use custom `CodeActionKind`s to support client-side filtering Open

component: hls-plugin-api component: plugins level: easy type: enhancement

haskell/haskell-language-server#1458 · 12 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Import code action imports inside of CPP Open

component: ghcide type: bug

haskell/haskell-language-server#1490 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
File permission error on Windows Open

os: windows status: needs info type: bug

haskell/haskell-language-server#1507 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
New quick fix: renaming on duplicate definition error Open

component: ghcide component: hls-rename-plugin type: enhancement

haskell/haskell-language-server#1532 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
File prefixes cannot be matched if files are located in mapped drives over SMB on Windows Open

os: windows type: bug

haskell/haskell-language-server#1630 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add a executable flag/code action to clean out all caches Open

component: ghcide component: hie-bios level: easy type: enhancement

haskell/haskell-language-server#1682 · 6 comments · 4 reactions · 0 assignees · Indexed Sep 14, 2026
Inconsistent/unhelpful types in hover messages Open

component: ghcide type: bug

haskell/haskell-language-server#1691 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Spurious errors from extra-project Haskell files. Open

component: hie-bios status: needs info type: bug

haskell/haskell-language-server#1703 · 9 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
HLS suggests adding language extensions on terms with the same name (revisit after #1390) Open

component: hls-pragmas-plugin status: blocked type: bug

haskell/haskell-language-server#1720 · 2 comments · 5 reactions · 0 assignees · Indexed Sep 14, 2026
Add support for going to definition of overloaded labels as field lenses Open

status: in discussion type: enhancement

haskell/haskell-language-server#1756 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Better error reporting in raw hls (no wrapper) of invalid project config file (package.yaml, .cabal, stack yaml or cabal.project) Open

component: hie-bios type: enhancement

haskell/haskell-language-server#1757 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Inline function at specific use site Open

component: hls-retrie-plugin level: easy type: enhancement

haskell/haskell-language-server#1758 · 5 comments · 4 reactions · 0 assignees · Indexed Sep 14, 2026
Hole fits: Don't suggest trivial infinite recursion Open

component: ghcide type: enhancement

haskell/haskell-language-server#1804 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
hls-eval-plugin tests nearly all fail when trying to build with nixpkgs Open

component: hls-eval-plugin old_type: distribution type: bug

haskell/haskell-language-server#1809 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
failed to parse result of calling cabal (better error message) Open

type: enhancement

haskell/haskell-language-server#1812 · 12 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Feature request: Multiline input for eval plugin Open

component: hls-eval-plugin type: enhancement

haskell/haskell-language-server#1817 · 4 comments · 12 reactions · 0 assignees · Indexed Sep 14, 2026
False positive: Main.hs (executable) does not recognise function defined in Lib.hs (library) Open

build tool: stack can-workaround component: hie-bios status: blocked type: bug

haskell/haskell-language-server#1822 · 30 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

haskell/haskell-language-server

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