Ignore trailing whitespace in rules

src/lib/ownership/OwnershipEngine.test.ts

@@ -158,6 +158,17 @@ describe('OwnershipEngine', () => {
       expect(() => OwnershipEngine.FromCodeownersFile('some/codeowners/file'))
         .toThrowError(expectedError);
     });
+
+    it('ignore trailing whitespace', () => {
+      // Arrange
+      const codeowners = 'some/file @org/owners ';
+
+      readFileSyncMock.mockReturnValue(Buffer.from(codeowners));
+
+      // Assert
+      expect(() => OwnershipEngine.FromCodeownersFile('some/codeowners/file'))
+        .not.toThrow();
+    });
   });
 
   describe.each<any>(patterns)('$name: "$pattern"', ({ name, pattern, paths }) => {

src/lib/ownership/OwnershipEngine.ts

@@ -63,7 +63,7 @@ export class OwnershipEngine {
 
 const createMatcherCodeownersRule = (rule: string): FileOwnershipMatcher => {
   // Split apart on spaces
-  const parts = rule.split(/\s+/);
+  const parts = rule.split(/\s+/).filter(Boolean);
 
   // The first part is expected to be the path
   const path = parts[0];