OK… I see your problem… First Off… That manager that is in the REPO is my new GLTF based Scene Manager API… Will not work in Classic Edition Exporter.
The Classic Edition tsconfig.json looks like this (and is generated every build):
"allowJs" : false,
"outFile": "/Users/Mackey/Documents/Unity/Babylon Legacy Playground/Export/debug/BabylonPlayground.js"
You dont have to manually put tsconfig.json in your project folder… the build will handle that using the config template (/Assets/Babylon/Templates/Config/options.json)
Second… It looks like you took the WHOLE repo and imported into your project.
YOU ONLY NEED TO DRAG THE Babylon Editor Toolkit.unitypackage from the the redist folder into your clean Unity Project.
You should have a folder layout like this (/Assets/Babylon is Main Toolkit Folder):
The Getting Started Video goes into all this… How to setup and add a script component… I think… I will review the video as well