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Setting Up Deno's LSP in Neovim

suresh pradhana

Configure Deno LSP in Neovim with coc.nvim and coc-deno Extension

Install coc.nvim

coc.nvim is a language server protocol client for neovim. It provides language support for various languages.

Install coc.nvim using your favorite plugin manager. I use lazy.nvim, in Lua,for others check this link

require('lazy') {
    {'neoclide/coc.nvim', {'branch': 'release'}}
}

Install coc-deno extension

coc uses extensions to provide language support. Install the coc-deno extension using the following command:

:CocInstall coc-deno

or add it to your init.lua file to load the extension on startup:

vim.g.coc_global_extensions = { 'coc-deno' }

you can add your required extensions to the coc_global_extensions list.

link to the deno extension: coc-deno and check other extensions here

Configuration

Just like vscode lsp configuration, you can configure the deno lsp in coc-settings.json file. You can open the file using :CocConfig command. Add the following configuration to the file:

{
  "deno.enable": true,
  "deno.lint": true,
  "deno.unstable": true,
  "coc.preferences.formatOnSave": true,
  "coc.preferences.enableMessageDialog": true,
  "suggest.floatConfig": {
    "border": true
  },
  "signature.floatConfig": {
    "border": true
  },
  "hover.floatConfig": {
    "border": true
  },
  "svelte.enable-ts-plugin": true,
  "snippets.ultisnips.pythonPrompt": false
}
  • deno.enable: Enable Deno LSP
  • deno.lint: Enable linting
  • deno.unstable: Enable unstable features
  • coc.preferences.formatOnSave: Format on save

the other are optional configurations for float windows and other plugins.

if deno.enable is not set to true, you have to enable it manually using :CocCommand deno.initilizeWorkspace command.

Conclusion

This is how i set up deno lsp in neovim using coc.nvim and coc-deno extension. for more information check the official documentation of the plugins and extensions.