v12.beta1 - LSP is not working. Maybe related to pnpm but I'm not sure

[DZakh]

1. Go to the branch https://github.com/DZakh/sury/tree/rescript-v12.beta
2. Run pnpm i && pnpm res from the root
3. See how in packages/sury/src/Sury.res LSP is not working

I also tried with a legacy compiler. And opening the packages/sury folder separately.

I assume might be caused by using pnpm.

[DZakh]

ReScript tooling: Internal error. Something broke. Here's the error message that you can report if you want: Error: Command failed: /Users/dzakh/.cursor/extensions/chenglou92.rescript-vscode-1.62.0-universal/server/analysis_binaries/darwinarm64/rescript-editor-analysis.exe hover /Users/dzakh/code/DZakh/rescript-schema/packages/sury/src/Sury.res 3456 9 /var/folders/pv/vz3qt1p52g72mw05tb7gzgy00000gn/T/rescript_format_file_44871_21 true (this message will only be reported once every 15 minutes)

[DZakh]

Well, I'm actually not sure of pnpm, since it worked with v11.

[nojaf]

The lockfile got renamed, we didn't take this into account yet. It hasn't been 24 hours since the beta came out...

[DZakh]

Still have the problem with beta.5, now with the binary file not being found.

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/Users/dzakh/code/DZakh/rescript-schema/packages/sury/node_modules/@rescript/darwin-arm64/bin.js' imported from /Users/dzakh/.cursor/extensions/chenglou92.rescript-vscode-1.64.0-universal/server/out/cli.js
    at finalizeResolution (node:internal/modules/esm/resolve:283:11)
    at moduleResolve (node:internal/modules/esm/resolve:959:10)
    at defaultResolve (node:internal/modules/esm/resolve:1195:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:642:12)
    at #cachedDefaultResolve (node:internal/modules/esm/loader:591:25)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:574:38)
    at ModuleLoader.getModuleJobForImport (node:internal/modules/esm/loader:236:38)
    at ModuleLoader.import (node:internal/modules/esm/loader:539:34)
    at defaultImportModuleDynamicallyForScript (node:internal/modules/esm/utils:228:31)
    at importModuleDynamicallyCallback (node:internal/modules/esm/utils:250:12) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file:///Users/dzakh/code/DZakh/rescript-schema/packages/sury/node_modules/@rescript/darwin-arm64/bin.js'
}

Solved it by manually installing "@rescript/darwin-arm64": "12.0.0-beta.5", as a dev dependency, but I assume it should be working automatically.

[DZakh]

Probably this is a ReScript repo issue 🤔

[tx46]

any ideas on how to fix this?

[nojaf]

This might the same problem as in https://github.com/rescript-lang/rescript-vscode/issues/1127. I think the solution is https://github.com/rescript-lang/rescript-vscode/issues/1127#issuecomment-3291275266

In https://github.com/rescript-lang/rescript/pull/7889, I'm storing the bsc path used in compilation in a JSON file. Tooling should be able to pick this up once available.

[nojaf]

Could you both try out latest beta (12) and latest vsix (1.65.7).

If it doesn't work, try post the result of the Dump LSP Server State command.

[tx46]

i'm not sure what you mean by 1.65.7. i had 1.64.0 and then did a switch to @next, which gave me 1.65.0-next-c1b3031.0.

i'm on emacs btw, not vscode. this still does not work with pnpm (but works fine with npm and also bun):

node:internal/modules/esm/resolve:275
    throw new ERR_MODULE_NOT_FOUND(
          ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '<project path>/node_modules/@rescript/linux-x64/bin.js' imported from ~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js
    at finalizeResolution (node:internal/modules/esm/resolve:275:11)
    at moduleResolve (node:internal/modules/esm/resolve:860:10)
    at defaultResolve (node:internal/modules/esm/resolve:984:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:685:12)
    at #cachedDefaultResolve (node:internal/modules/esm/loader:634:25)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:617:38)
    at ModuleLoader.getModuleJobForImport (node:internal/modules/esm/loader:273:38)
    at onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:577:36)
    at TracingChannel.tracePromise (node:diagnostics_channel:344:14)
    at ModuleLoader.import (node:internal/modules/esm/loader:576:21) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file:///<project path>/node_modules/@rescript/linux-x64/bin.js'
}

Node.js v22.14.0

[tx46]

language-server@next is entirely unusable for me in emacs and just crashes constantly with stuff like:

Error: Command failed: <project path>/node_modules/.pnpm/@[email protected]/node_modules/@rescript/linux-x64/bin/rescript-editor-analysis.exe hover SomeFileInTheProject.res 22 16 /tmp/rescript_format_file_11770_2 false
    at genericNodeError (node:internal/errors:983:15)
    at wrappedFn (node:internal/errors:537:14)
    at checkExecSyncError (node:child_process:882:11)
    at Object.execFileSync (node:child_process:918:15)
    at Rt (~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js:40:6642)
    at lt (~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js:40:6854)
    at jw (~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js:46:6748)
    at wi.Ry [as callback] (~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js:46:16936)
    at Object.thunk (~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js:3:547) {
  status: null,
  signal: 'SIGSEGV',
  output: [ null, <Buffer >, <Buffer > ],
  pid: 12135,
  stdout: <Buffer >,
  stderr: <Buffer >

1.64 works fine (with npm and bun, but not pnpm)

[tx46]

ok, i got something working:

1. i need beta 13 (12 not working, might be https://github.com/rescript-lang/rescript/pull/7889 that fixes it?)
2. i need to install @rescript/linux-x64@ci in the project
3. i use @rescript/language-server@next (1.65.0-next-c1b3031.0)

this seems to work with only intermittent crashes, and also i get a warning during startup:

⛔ Warning (lsp-mode): Unknown notification: rescript/compilationStatus

other than that, it's actually functional

[nojaf]

i need to install @rescript/linux-x64@ci in the project

I would expect that is no longer a requirement. Does your compiler-info.json look fine? Can you post that?

[tx46]

i need to install @rescript/linux-x64@ci in the project

I would expect that is no longer a requirement. Does your compiler-info.json look fine? Can you post that?

i think it's needed, or at least it wouldn't work until i installed it..

{
  "version": "12.0.0-beta.13",
  "bsc_path": "<project path>/node_modules/.pnpm/@[email protected]/node_modules/@rescript/linux-x64/bin/bsc.exe",
  "bsc_hash": "1841d2f845430dd2e3448056c0dfb2c6710a9d9a447b11af781ed06c52c276c6",
  "rescript_config_hash": "90bb8e2f7c795b12902b9b0cc0a7a76076cf19149bcc7f061334a63f55ff7d09",
  "runtime_path": "<project path>/node_modules/.pnpm/@[email protected]/node_modules/@rescript/runtime",
  "generated_at": "1759196003428"
}

does this look as it should?

[nojaf]

does this look as it should?

It does, but that looks to me like you are using the @rescript+linux-x64 dependency from ReScript and not the explicit install.

@DZakh does it work for you now? Can we close this?

[tx46]

does this look as it should?

It does, but that looks to me like you are using the @rescript+linux-x64 dependency from ReScript and not the explicit install.

@DZakh does it work for you now? Can we close this?

i just tried pnpm removing the @rescript/linux-x64@ci package and the lsp immediately stops working with this again:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '<project path>/node_modules/@rescript/linux-x64/bin.js' imported from ~/.local/share/pnpm/global/5/.pnpm/@[email protected]/node_modules/@rescript/language-server/out/cli.js
    at finalizeResolution (node:internal/modules/esm/resolve:275:11)
    at moduleResolve (node:internal/modules/esm/resolve:860:10)
    at defaultResolve (node:internal/modules/esm/resolve:984:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:685:12)
    at #cachedDefaultResolve (node:internal/modules/esm/loader:634:25)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:617:38)
    at ModuleLoader.getModuleJobForImport (node:internal/modules/esm/loader:273:38)
    at onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:577:36)
    at TracingChannel.tracePromise (node:diagnostics_channel:344:14)
    at ModuleLoader.import (node:internal/modules/esm/loader:576:21) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file://<project path>/node_modules/@rescript/linux-x64/bin.js'
}

compiler-info.json:

{
  "version": "12.0.0-beta.13",
  "bsc_path": "<repo root>/node_modules/.pnpm/@[email protected]/node_modules/@rescript/linux-x64/bin/bsc.exe",
  "bsc_hash": "1841d2f845430dd2e3448056c0dfb2c6710a9d9a447b11af781ed06c52c276c6",
  "rescript_config_hash": "29abb8a0969242d5b126e9717c2ef29c52287a236b4aaf3258d1be9b212c0a13",
  "runtime_path": "<repo root>/node_modules/.pnpm/@[email protected]/node_modules/@rescript/runtime",
  "generated_at": "1759373668071"
}

is this because its a monorepo? project path != repo root

[nojaf]

Thanks, for this report, I can see where things can still go wrong with pnpm.

[nojaf]

@tx46 can you give 1.65.9 a spin?

[tx46]

@tx46 can you give 1.65.9 a spin?

works now!

[nojaf]

@DZakh can we close this?

[nojaf]

Going to close this, please open a new issue if related problems pop up.