Neovim Language Support

LazyVim Linting and Formatting

Source: LazyVim: Linting and Formatting - YouTube with Elijah Manor

• Use LazyVim’s language extras to setup environment for your language

• Can configure linters like ESLint for JS

  • Modify .eslintrc.json and configure linter messages
    • Can extend to use prettier

• How to find errors/warnings?

  • See neo tree indicators
  • View code diagnostics for buffer: SPC x x
    • View code diagnostics for line: SPC c d
  • Search diagnostics: SPC s d (buffer) / D (root dir)

• Fixing errors

  • Code action: SPC c a …
  • Code action, fix all issues: SPC c A

• Additional formatting with prettier in LazyVim extras

  • Create prettier config npx prettier-init in code directory

• null-ls.nvim has formatting sources

  • proselint - formatter for English
  • Can register formatters with mason, configure null-ls for diagnostics

Understanding Neovim with Treesitter

Source: Understanding Neovim #4 - Treesitter - YouTube

Treesitter does efficient parsing of languages. It creates a tree of a syntax, incremental as the file changes without re-parsing the whole file

It helps with things like:

• Highlights words
• Pattern matching, like search

nvim-treesitter plugin helps with installation of the correct parsers with specific queries.

• :TSInstall installs parsers for languages
• :InspectTree browse syntax tree

Allows navigation of code like:

• Comment
• Function
• Declaration
• Fields
• Statements

Running nvim-treesitter with tree-sitter CLI on Windows 11 using MinGW

Following is a solution to using MinGW on Windows with the tree-sitter CLI

I was able to get tree-sitter build compilations working using mingw’s `gcc` without installing MSVC (cl.exe is not installed). Per discussion in the link above, the workaround is not related to nvim-treesitter, but rather setting the compiler for the the Rust `cc` crate used by the tree-sitter cli build commands.

1. Install mingw’s gcc. For example, follow instructions recommended by the cc crate which uses msys2 and the mingw gcc package.
2. Set shell environment variable of `CC` to `gcc`. The environment variable setting is from the cc Rust crate documentation on setting the compiler used.
3. Run nvim and compilation should work now

Example workaround assuming nvim, tree-sitter CLI, and msys2 are installed

# Go into msys2
ucrt64

# Install mingw gcc
pacman -Syu mingw-w64-ucrt-x86_64-gcc

# Verify the gcc in the environment points to the mingw one
which gcc

# Set compiler that tree-sitter CLI will use
export CC="gcc"

nvim

Tested on 2025-09-18 with:

• NVIM v0.11.4
• tree-sitter 0.25.9
• Neovim distribution: LazyVim 15.x

On Windows, Mason Installs hitting Long Path Error

Error may be caused during Python ruff, ty, and other language server installs.

For ruff and ty, a fix is to create a Python virtual environment in a short directory like ~/nm. Run neovim inside the virtual environment. The install should use virtual environment python for installations, bypassing long file names that otherwise would be created.