test(no-large-snapshots): workaround instanceof issue in ESLint v9

Author: G-Rath

src/rules/__tests__/no-large-snapshots.test.ts

@@ -240,6 +240,15 @@ ruleTester.run('no-large-snapshots', rule, {
           messageId: 'tooLongSnapshots',
           data: { lineLimit: 50, lineCount: 58 },
         },
+        // todo: "instanceof" doesn't work with ESLint v9
+        ...(usingFlatConfig()
+          ? [
+              {
+                messageId: 'tooLongSnapshots' as const,
+                data: { lineLimit: 50, lineCount: 58 },
+              },
+            ]
+          : []),
       ],
     },
     {

src/rules/no-large-snapshots.ts

@@ -54,6 +54,7 @@ const reportOnViolation = (
       const snapshotName = getAccessorValue(node.expression.left.property);
 
       isAllowed = allowedSnapshotsInFile.some(name => {
+        /* istanbul ignore next */
         if (name instanceof RegExp) {
           return name.test(snapshotName);
         }