Most of the code is pink

[Yanpas]

My theme doesn't have pink color anywhere

[tangzx]

That pink color hints you the variable is Global, it recommends you use local variables as possible as you can. Such as function myfunc -> local function myfunc . And light green means a parameter，variables with under line means up-value. These colors can be customized：settings|extensions|emmylua

[Yanpas]

I see, that's semantic highlighting. That's ok if it can be disabled completely

"emmylua.semantic.coloring.enabled": false e.g.