a poor coded and not tested virtual filesystem made by me, but can be useful in future

filesystem.lua

__DANGER_filesystem = {}
file = {}

function file.exists(path)
    for filek, filev in ipairs(__DANGER_filesystem) do
        if string.find(filev.path, path, 0, true) then return true end
    end

    return false
end

function file.findPairs(pattern, path)
    local k = 0

    local iter = function(t, last)
        for filek = k + 1, #__DANGER_filesystem do
            if not path or string.find(__DANGER_filesystem[filek].path, path, 0, true) and string.find(__DANGER_filesystem[filek].path, pattern) then
                return (last or 0) + 1, __DANGER_filesystem[filek].path
            end
        end
    end

    return iter, nil, 0
end

function file.find(pattern, path)
    local fnext = file.findPairs(pattern, path)
    local _, v = fnext()

    return v
end

function file.read(path)
    for filek, filev in ipairs(__DANGER_filesystem) do
        if string.find(filev.path, path, 0, true) then return filev.content end
    end
end

function file.isFile(path)
    for filek, filev in ipairs(__DANGER_filesystem) do
        if string.find(filev.path, path, 0, true) and filev.path == path then return true end
    end

    return false
end

package.searchers = {
    package.searchers[1],
    function(moduleName)
        local content = file.read(moduleName) or file.read(moduleName .. "/init.lua")
        if content then return load(content) end
    end
}