I suspect that TSTL is doing something extremely inefficient when parsing Lua modules, because it triggers a stack size limit when there probably shouldn't be.

Steps to reproduce:

git clone git@github.com:IsaacScript/isaacscript-common.git
cd isaacscript-common
# The "bug" branch has some added functions that tip the library over the edge and cause errors
git checkout bug
npm ci
./build.sh
cd ..
git clone git@github.com:Zamiell/test3.git
cd test3
npm ci
npx tstl

The test3 repository is just a sample end-user TSTL project that consumes the isaacscript-common TSTL Lua module.

test3 only contains the following code:

import { upgradeMod } from "isaacscript-common";

const modVanilla = RegisterMod("TEST", 1);
const mod = upgradeMod(modVanilla);

Essentially, this is enough for TSTL to hit the stack limit, because "isaacscript-common" has too many functions in it.