This function removes all comments from your code using treesitter in nvim.

remove_comments.lua

local RemoveComments = function()
    local ts         = vim.treesitter
    local bufnr      = vim.api.nvim_get_current_buf()
    local ft         = vim.bo[bufnr].filetype
    local lang       = ts.language.get_lang(ft) or ft

    local ok, parser = pcall(ts.get_parser, bufnr, lang)
    if not ok then return vim.notify("No parser for " .. ft, vim.log.levels.WARN) end

    local tree   = parser:parse()[1]
    local root   = tree:root()
    local query  = ts.query.parse(lang, "(comment) @comment")

    local ranges = {}
    for _, node in query:iter_captures(root, bufnr, 0, -1) do
        table.insert(ranges, { node:range() })
    end

    table.sort(ranges, function(a, b)
        if a[1] == b[1] then return a[2] < b[2] end
        return a[1] > b[1]
    end)

    for _, r in ipairs(ranges) do
        vim.api.nvim_buf_set_text(bufnr, r[1], r[2], r[3], r[4], {})
    end
end
vim.api.nvim_create_user_command("RemoveComments", RemoveComments, {})