Show an error in cell output when trying to load an unsupported output type. (#19693)

src/sql/workbench/contrib/notebook/browser/models/outputProcessor.ts

@@ -8,6 +8,7 @@ import { nb } from 'azdata';
 import { JSONObject, isPrimitive } from 'sql/workbench/services/notebook/common/jsonext';
 import { nbformat } from 'sql/workbench/services/notebook/common/nbformat';
 import { MimeModel } from 'sql/workbench/services/notebook/browser/outputs/mimemodel';
+import * as nls from 'vs/nls';
 
 /**
  * A multiline string.
@@ -46,6 +47,8 @@ export function getData(output: nb.ICellOutput): JSONObject {
 		} else if (output.evalue) {
 			bundle['application/vnd.jupyter.stderr'] = output.ename ? `${output.ename}: ${output.evalue}` : `${output.evalue}`;
 		}
+	} else {
+		bundle['application/vnd.jupyter.stderr'] = nls.localize('notebookInvalidOutputTypeError', "Output type '{0}' not recognized.", output.output_type);
 	}
 	return convertBundle(bundle);
 }

src/sql/workbench/contrib/notebook/test/browser/outputProcessor.test.ts

@@ -67,6 +67,20 @@ suite('OutputProcessor functions', function (): void {
 				verifyGetDataForStreamOutput(output);
 			});
 		}
+
+		// unknown output types
+		test('Should report an error for unknown output types', () => {
+			const output = {
+				output_type: 'unknown',
+				data: {
+					'text/html': 'Test text'
+				},
+				metadata: {}
+			};
+			const result = op.getData(<any>output);
+			assert(result['application/vnd.jupyter.stderr'] !== undefined, 'Should set an error message after receiving unknown output type.');
+			assert(result['text/html'] === undefined, 'Should not add any data after receiving unknown output type.');
+		});
 	});
 
 	suite('getMetadata', function (): void {