fix: prevent RangeError in GitIgnoreParser for root paths (#3417)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/core/src/utils/gitIgnoreParser.test.ts

@@ -161,6 +161,21 @@ src/*.tmp
       expect(parser.isIgnored('node_modules\\package')).toBe(true);
       expect(parser.isIgnored('src\\temp.tmp')).toBe(true);
     });
+
+    it('should handle root path "/" without throwing error', () => {
+      expect(() => parser.isIgnored('/')).not.toThrow();
+      expect(parser.isIgnored('/')).toBe(false);
+    });
+
+    it('should handle absolute-like paths without throwing error', () => {
+      expect(() => parser.isIgnored('/some/path')).not.toThrow();
+      expect(parser.isIgnored('/some/path')).toBe(false);
+    });
+
+    it('should handle paths that start with forward slash', () => {
+      expect(() => parser.isIgnored('/node_modules')).not.toThrow();
+      expect(parser.isIgnored('/node_modules')).toBe(false);
+    });
   });
 
   describe('getIgnoredPatterns', () => {

packages/core/src/utils/gitIgnoreParser.ts

@@ -61,7 +61,12 @@ export class GitIgnoreParser implements GitIgnoreFilter {
       ? path.relative(this.projectRoot, filePath)
       : filePath;
 
-    if (relativePath === '' || relativePath.startsWith('..')) {
+    if (
+      relativePath === '' ||
+      relativePath.startsWith('..') ||
+      relativePath === '/' ||
+      relativePath.startsWith('/')
+    ) {
       return false;
     }