trying to add a customized function in fuzzy.sorts

[ogios]

i'm trying to make codeium results to be place on the top, and so i found one option maybe can do this, which is fuzzy.sorts, i can pass a function to sort it.

and i did:

    opts = {
      fuzzy = {
        --- @type blink.cmp.SortFunction
        sorts = {
          function(a, b)
            return a.source_id == "codeium"
          end,
          -- "score",
          -- "kind",
          -- "label",
        },
      },
    },

but it raise:

Error executing vim.schedule lua callback: ...l/share/nvim/lazy/blink.cmp/lua/blink/cmp/fuzzy/sort.lua:11: invalid order function for sorting
stack traceback:
	[C]: in function 'sort'
	...l/share/nvim/lazy/blink.cmp/lua/blink/cmp/fuzzy/sort.lua:11: in function 'fuzzy'
	...re/nvim/lazy/blink.cmp/lua/blink/cmp/completion/list.lua:109: in function 'fuzzy'
	...re/nvim/lazy/blink.cmp/lua/blink/cmp/completion/list.lua:85: in function 'show'
	...re/nvim/lazy/blink.cmp/lua/blink/cmp/completion/init.lua:34: in function <...re/nvim/lazy/blink.cmp/lua/blink/cmp/completion/init.lua:29>

This might seems like a lua related thing not blink's logic:

function sort.sort(list)
  local config = require('blink.cmp.config').fuzzy.sorts
  local sorting_funcs = vim.tbl_map(
    function(name_or_func) return type(name_or_func) == 'string' and sort[name_or_func] or name_or_func end,
    config
  )
  table.sort(list, function(a, b)
    for _, sorting_func in ipairs(sorting_funcs) do
      local result = sorting_func(a, b)
      if result ~= nil then return result end
    end
  end)
  return list
end

i'm not so deep into lua, and i don't understand why this happens...