This is the base class for Godot's resource importers. To implement your own resource importers using editor plugins, see EditorImportPlugin.
IMPORT_ORDER_DEFAULT = 0
The default import order.
IMPORT_ORDER_SCENE = 100
The import order for scenes, which ensures scenes are imported after all other core resources such as textures. Custom importers should generally have an import order lower than 100
to avoid issues when importing scenes that rely on custom resources.