fix(ignoreSnapshots): print a notice when ignoreSnapshots option is on

packages/playwright-test/src/plugins/ignoreSnapshotsNoticePlugin.ts

@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import type { Reporter, Suite } from '../../types/testReporter';
+import type { FullConfigInternal } from '../types';
+import { colors } from 'playwright-core/lib/utilsBundle';
+
+export const ignoreSnapshotsPlugin = {
+  name: 'playwright:ignore-snapshots-notice',
+
+  async setup(config: FullConfigInternal, configDir: string, rootSuite: Suite, reporter: Reporter) {
+    if (config._ignoreSnapshots) {
+      reporter.onStdOut?.(colors.yellow([
+        'NOTE: running with "ignoreSnapshots" option. All of the following asserts are silently ignored:',
+        '- expect().toMatchSnapshot()',
+        '- expect().toHaveScreenshot()',
+        '',
+      ].join('\n')));
+    }
+  },
+};

packages/playwright-test/src/runner.ts

@@ -44,6 +44,7 @@ import { SigIntWatcher } from './sigIntWatcher';
 import type { TestRunnerPlugin } from './plugins';
 import { setRunnerToAddPluginsTo } from './plugins';
 import { webServerPluginsForConfig } from './plugins/webServerPlugin';
+import { ignoreSnapshotsPlugin } from './plugins/ignoreSnapshotsNoticePlugin';
 import { dockerPlugin } from './docker/docker';
 import { MultiMap } from 'playwright-core/lib/utils/multimap';
 
@@ -603,6 +604,9 @@ export class Runner {
       }
     };
 
+    // The ignoreSnapshots notice
+    this._plugins.push(ignoreSnapshotsPlugin);
+
     // Legacy webServer support.
     this._plugins.push(...webServerPluginsForConfig(config));