LSP: Mason and LspSettings

with Mason.nvim you can easily and quickly install an lsp

Example with tsserver

Installation

:LspInstall tsserver

Configuration

Run :LspSettings tsserver and a file called tsserver.json will open

Configuration example activating inlay hints

tsserver.json

{
  "javascript.inlayHints.includeInlayEnumMemberValueHints": true,
  "javascript.inlayHints.includeInlayFunctionLikeReturnTypeHints": true,
  "javascript.inlayHints.includeInlayFunctionParameterTypeHints": true,
  "javascript.inlayHints.includeInlayParameterNameHints": "all",
  "javascript.inlayHints.includeInlayParameterNameHintsWhenArgumentMatchesName": true,
  "javascript.inlayHints.includeInlayPropertyDeclarationTypeHints": true,
  "javascript.inlayHints.includeInlayVariableTypeHints": true,
 
  "typescript.inlayHints.includeInlayEnumMemberValueHints": true,
  "typescript.inlayHints.includeInlayFunctionLikeReturnTypeHints": true,
  "typescript.inlayHints.includeInlayFunctionParameterTypeHints": true,
  "typescript.inlayHints.includeInlayParameterNameHints": "all",
  "typescript.inlayHints.includeInlayParameterNameHintsWhenArgumentMatchesName": true,
  "typescript.inlayHints.includeInlayPropertyDeclarationTypeHints": true,
  "typescript.inlayHints.includeInlayVariableTypeHints": true
}

What to do if mason is not supported on your platform

you will have to configure lsp manually from the file ~/.config/nvim/lua/userconfig/lsp.lua

Manual Installation

lsp.lua

require('lspconfig')['tsserver'].setup {
  capabilities = capabilities,
  on_attach = on_attach
}

Manual Configuration

You can modify everything you want: commands, root dirs, settings, etc.

lsp.lua

require('lspconfig')['tsserver'].setup {
  cmd = { "typescript-language-server", "--stdio" },
  filetypes = { "javascript", "javascriptreact", "javascript.jsx", "typescript", "typescriptreact", "typescript.tsx" },
  init_options = {
    hostInfo = "neovim"
  },
  settings = {
    javascript = {
      inlayHints = {
        includeInlayEnumMemberValueHints = true,
        includeInlayFunctionLikeReturnTypeHints = true,
        includeInlayFunctionParameterTypeHints = true,
        includeInlayParameterNameHints = "all", -- 'none' | 'literals' | 'all';
        includeInlayParameterNameHintsWhenArgumentMatchesName = true,
        includeInlayPropertyDeclarationTypeHints = true,
        includeInlayVariableTypeHints = true,
      },
    },
    typescript = {
      inlayHints = {
        includeInlayEnumMemberValueHints = true,
        includeInlayFunctionLikeReturnTypeHints = true,
        includeInlayFunctionParameterTypeHints = true,
        includeInlayParameterNameHints = "all", -- 'none' | 'literals' | 'all';
        includeInlayParameterNameHintsWhenArgumentMatchesName = true,
        includeInlayPropertyDeclarationTypeHints = true,
        includeInlayVariableTypeHints = true,
      },
    },
  },
  single_file_support = true,
  root_dir = require("lspconfig").util.root_pattern("package.json", "tsconfig.json", "jsconfig.json", ".git"),
  on_attach = on_attach
}

Formatters

Many lsp's like rust analyzer or zls come with default formatters which can be called with the command :lua vim.lsp.buf.format()

For cases where there is no default formatter you can use Mason to install formatters and null-ls will take care of assigning them

Example with Python

:MasonInstall autopep8

With null-ls:

Without null-ls:

In case mason does not work on your platform

You can manually install the formatters and use the following command :Neoformat click here (opens in a new tab) for more information about Neoformat

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