Refresh Codelens on LSP attachment in Neovim

auto_refresh_codelens.lua

-- trigger upon LSP attachment
vim.api.nvim_create_autocmd('User', {
    pattern = 'LspAttached',
    once = true,
    callback = vim.lsp.codelens.refresh,
})

-- ... servers and enhanced_opts ...

for _, lsp in ipairs(servers) do
    local opts = {
        on_attach = function(_, bufnr)
            -- refresh codelens on TextChanged and InsertLeave as well
            vim.api.nvim_create_autocmd({ 'TextChanged', 'InsertLeave' }, {
                buffer = bufnr,
                callback = vim.lsp.codelens.refresh,
            })
            -- trigger codelens refresh
            vim.api.nvim_exec_autocmds('User', { pattern = 'LspAttached' })
        end,
    }

    if enhanced_opts[lsp] then
        enhanced_opts[lsp](opts)
    end

    require('lspconfig').setup(opts)
end