src/vs/workbench/common/editor.ts/EditorFactoryRegistry/start
class EditorFactoryRegistry:	start(accessor: ServicesAccessor): void {
		const instantiationService = this.instantiationService = accessor.get(IInstantiationService);

		for (const [key, ctor] of this.editorSerializerConstructors) {
			this.createEditorSerializer(key, ctor, instantiationService);
		}

		this.editorSerializerConstructors.clear();
	}