src/vs/editor/browser/services/abstractCodeEditorService.ts/AbstractCodeEditorService/constructor
class AbstractCodeEditorService:	constructor(
		@IThemeService private readonly _themeService: IThemeService,
	) {
		super();
		this._codeEditors = Object.create(null);
		this._diffEditors = Object.create(null);
		this._globalStyleSheet = null;
	}