vim.g.base46_cache = vim.fn.stdpath('data') .. '/base46_cache/'

• Make sure to read nvconfig to know default options
• lua/chadrc.lua file must return a table which follows the structure of nvconfig.

---@type ChadrcConfig
local M = {}

M.ui = {
  theme = "onedark"
}

return M

Install plugin

• Base46 just compiles your theme + settings into bytecode , so its not a startup plugin.

{ "nvim-lua/plenary.nvim", lazy = true },

{
    "NvChad/base46",
    lazy = true,
    build = function()
      require("base46").load_all_highlights()
    end,
},

-- if u want nvchad's ui plugin :)
{
    "NvChad/ui",
    config = function()
      require "nvchad"
    end,
},

-- dependency for ui 
{
    "nvim-tree/nvim-web-devicons",
    lazy = true,
    opts = function()
      return { override = require "nvchad.icons.devicons" }
    end,
    config = function(_, opts)
      dofile(vim.g.base46_cache .. "devicons")
      require("nvim-web-devicons").setup(opts)
    end,
  },

• Load cache file by dofile function ( add this in your startup )

dofile(vim.g.base46_cache .. "defaults")
dofile(vim.g.base46_cache .. "statusline")

• Similarly you can load other highlight groups. Do read https://nvchad.com/docs/config/theming/
• A video which shows me testing it on a non nvchad config https://0x0.st/Xrbn.mp4
• If for some reason you messed up and base46 didnt compile :

require('base46').load_all_highlights() -- this compiles + loads hl

• You can load all cache files at once instead of lazyloding them

for _, v in ipairs(vim.fn.readdir(vim.g.base46_cache)) do
  dofile(vim.g.base46_cache .. v)
end