extensions/ipynb/src/deserializers.ts/isEmptyVendoredMimeType
function isEmptyVendoredMimeType(outputItem: NotebookCellOutputItem) {
	if (outputItem.mime.startsWith('application/vnd.')) {
		try {
			return outputItem.data.byteLength === 0 || Buffer.from(outputItem.data).toString().length === 0;
		} catch { }
	}
	return false;
}