Elm-language-server with Vim CoC

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1

Hi all, new to elm here and trying to set up vim to work with it.

I’ve spent a few hours now trying to set up CoC for the first time to work with the elm-language-server. The coc-json plugin works turnkey, but I run into issues with Elm.

Currently, the LS doesn’t start properly:
[coc.nvim] Server languageserver.elmLS failed to start: Error: Request initialize failed with message: Attempted to resolve unregistered dependency token: "ElmWorkspaces"

My CoC configuration:

{               
    "coc.preferences.formatOnSaveFiletypes": [    
      "elm"             
    ],                              
    "languageserver": {    
      "elmLS": {    
        "command": "elm-language-server",    
        "filetypes": [    
          "elm"    
        ],    
        "rootPatterns": [    
          "elm.json"    
        ],    
        "trace.server": "verbose",    
        "initializationOptions": {    
          "elmPath": "elm",    
          "elmFormatPath": "elm-format",    
          "elmTestPath": "elm-test",    
          "disableElmLSDiagnostics": false,    
          "skipInstallPackageConfirmation": false    
        }    
      }    
    }    
  }

CocInfo shows:

## versions

vim version: NVIM v0.4.4
node version: v16.3.0
coc.nvim version: 0.0.80-1377f3bfcc
coc.nvim directory: /home/joshua/.local/share/nvim/plugged/coc.nvim
term: tmux
platform: linux

## Log of coc.nvim

2021-06-17T22:25:14.721 INFO (pid:47782) [services] - registered service "languageserver.elmLS"
2021-06-17T22:25:14.730 INFO (pid:47782) [services] - elmLS state change: stopped => starting
2021-06-17T22:25:14.735 INFO (pid:47782) [plugin] - coc.nvim 0.0.80-1377f3bfcc initialized with node: v16.3.0 after 89ms
2021-06-17T22:25:14.741 INFO (pid:47782) [language-client-index] - Language server "languageserver.elmLS" started with 47799
2021-06-17T22:25:15.338 INFO (pid:47782) [services] - elmLS state change: starting => stopped
2021-06-17T22:25:15.341 ERROR (pid:47782) [services] - Server languageserver.elmLS failed to start: ResponseError2: Request initialize failed with message: Attempted to resolve unregistered dependency token: "ElmWorkspaces"
    at handleResponse (/home/joshua/.local/share/nvim/plugged/coc.nvim/build/index.js:14139:40)
    at processMessageQueue (/home/joshua/.local/share/nvim/plugged/coc.nvim/build/index.js:13994:13)
    at Immediate.<anonymous> (/home/joshua/.local/share/nvim/plugged/coc.nvim/build/index.js:13980:11)
    at processImmediate (node:internal/timers:464:21) {
  code: -32603,
  data: undefined
}
2021-06-17T22:27:14.714 INFO (pid:47782) [attach] - receive notification: showInfo []

Really appreciate any help, I’ve been stumbling at this for a few days now.

2

Nevermind, for some reason the plugin works now. Maybe it needed more time to initialize.

3

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