Export module Lua

Exports and imports are done by returning tables from files, and then importing them with require().

lib.lua:

lua

local M = {}

M.sum = function(a, b)
    return a + b
end

return M

app.lua

lua

local lib = require("lib")

-- 4
lib.sum(1, 3)

There's another Lua function called dofile(filepath) which

Unsafely here means instead of erroring out early, it will bubble the error up into a return code.

So that you can handle the error at the callsite, rather than in the file itself.

require() is like dofile() except that it has some additional smarts to prevent doing the work of a module multiple times.

Export module Lua ​