A tool for transpiling GDScripts into GDExtension files
Download release (currently only windows)
Extract gdtoex folder to a tools folder (e.g. c:/dev-tools/)
Add gdtoex folder to PATH system variable (e.g. c:/dev-tools/gdtoex)
It's recommended that you set the Untyped Declaration option to error in your godot project (Project > Project Settings (Advanced Settings) > Debug > GDScript > Untyped Declaration)
and fix any type errors first
Prefix any GDScript class names with an underscore to have them exported as GDExtension classes, this is to make it a little easier to switch between GDScript and GDExtension versions.
Setup GDExtension
Open command line at the project path (c:/dev/godot/project1)
Run gdtoex command
GDExtension files should be written to output path
Run scons to compile the GDExtension
Run godot project
Project Path -p c:/dev/godot/project1 Override the project path (defaults to current directory)
Output Path -o ./cpp/src Overrides the output path (defaults to ./cpp/src)
Underscoring node classes won't replace the GDScript node with a GDExtension node in the scene tree, you will manually have to delete and add them
There is an issue with nested array initialisers - something that will need to be fixed in Godot