luacheck show warning when use "module" function in lua5.1

[stzb321]

Here is example of code:
a.lua

module("aModule" ,package.seeall)
AMethod = function()
    print("AMethod")
end

b.lua

aModule.AMethod()

.luacheckrc

std = "lua51"
codes = true
allow_defined_top = true

luacheck show accessing undefined variable warning when checking b.lua

In a.lua, aModule already be defined as a global variable.
Is the module function not supported in luacheck?