Calling (importing) other .lua files outside main.lua in Love2D - love2d

Question

So, I wanted to clean up my code by splitting it into seperate files. But for some reason I can't call the script I want to call through my main.lua.
Here's my main.lua script:
function love.load()
require "splash.lua"
splash.load()
end
function love.update(dt)
splash.update(dt)
end
function love.draw() print("Draw")
splash.draw()
love.graphics.print("FPS "..tostring(love.timer.getFPS( )), 5, 5) print("fps")
love.graphics.setColor(255,0,0) --Red
love.graphics.rectangle("fill", 3, 3, 60, 20)
end
And here's my splash.lua script, separate from the main.lua file:
function splash.load()
timer = 0 print("fadein")
alpha = 0
fadein = 2
display = 4
fadeout = 6
splashScreen = love.graphics.newImage("/images/Splash1.png")
end
function splash.update(dt)
timer = timer + dt
if 0 < timer and timer < fadein then
alpha = timer / fadein
end
if fadein < timer and timer < display then
alpha = 1
end
if display < timer and timer < fadeout then
alpha = 1 - ((timer - display) / (fadeout - display))
end
end
function splash.draw()
love.graphics.setColor(1, 1, 1, alpha)
local sx = love.graphics.getWidth() / splashScreen:getWidth()
local sy = love.graphics.getHeight() / splashScreen:getHeight()
love.graphics.draw(splashScreen, 0, 0, 0, sx, sy)
end
I've searched everywhere on this topic, and the other answers are either extremely vague or outdated. All I want to do is to make the splash.lua run when I start Love.

Answer 1

There were two problems which I noticed and once I fixed them something ran.
Problem 1
In main.lua, require "splash.lua" should be require "splash". If you code in other languages like python, java or javascript, you can think of require as similar to import.
Problem 2
In splash.lua, you are referencing an object(splash) which doesn't exist. To keep your code as similar as I could, I inserted the line splash = {} at the top of splash.lua. Once the object splash is created, you are then able to create functions for this object(splash.load(), splash.update(), and splash.draw()). This isn't a problem in main.lua because love is an object which already exists when the love2d game engine starts.
main.lua
function love.load()
require "splash"
splash.load()
end
function love.update(dt)
splash.update(dt)
end
function love.draw() print("Draw")
splash.draw()
love.graphics.print("FPS "..tostring(love.timer.getFPS( )), 5, 5) print("fps")
love.graphics.setColor(255,0,0) --Red
love.graphics.rectangle("fill", 3, 3, 60, 20)
end
splash.lua
splash = {}
function splash.load()
timer = 0 print("fadein")
alpha = 0
fadein = 2
display = 4
fadeout = 6
splashScreen = love.graphics.newImage("/images/Splash1.png")
end
function splash.update(dt)
timer = timer + dt
if 0 < timer and timer < fadein then
alpha = timer / fadein
end
if fadein < timer and timer < display then
alpha = 1
end
if display < timer and timer < fadeout then
alpha = 1 - ((timer - display) / (fadeout - display))
end
end
function splash.draw()
love.graphics.setColor(1, 1, 1, alpha)
local sx = love.graphics.getWidth() / splashScreen:getWidth()
local sy = love.graphics.getHeight() / splashScreen:getHeight()
love.graphics.draw(splashScreen, 0, 0, 0, sx, sy)
end
Side note: from reading your code, I'm not sure if you understand entirely how the load, update, and draw functions work. Love is an object created by the love2d game engine. The engine runs the load function only once when the game starts. The update function then continually checks for changes to the world that the game exists in and applies the code within love.update according to the conditions inside it. The draw function continually draws what it is told over and over again. These things happen automatically because it's already programmed into the love2d game engine.
The only reason I think you might be confused in this area is that you created a separate splash.load, splash.update, and splash.draw. You can technically name whatever functions you're calling anything you want, I just had the feeling that you might think that these load, update and draw functions might be called automatically, which they're not. Love2d only calls the load, update, and draw functions automatically for the love object.

Answer 2

Changing your require command to the following should work:
require("splash")
Additionally you should create the splash table before creating functions for said table.
splash = {}
splash.myFunction()
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