src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/OutputCell/clearOutput
class OutputCell:		public clearOutput(outputId: string, rendererId: string | undefined) {
			const output = this.outputElements.get(outputId);
			output?.clear(rendererId);
			output?.dispose();
			this.outputElements.delete(outputId);
		}