fix: avoid unnecessary Buffer conversion for large string content

lib/hexo/router.ts

@@ -21,16 +21,17 @@ class RouteStream extends Readable {
     this.modified = data.modified;
   }
 
-  // Assume we only accept Buffer, plain object, or string
-  _toBuffer(data: Buffer | object | string): Buffer | null {
+  // Accept Buffer, plain object, or string. Returns Buffer or string directly to avoid unnecessary conversion
+  _toBuffer(data: Buffer | object | string): Buffer | string | null {
     if (data instanceof Buffer) {
       return data;
     }
     if (typeof data === 'object') {
       data = JSON.stringify(data);
     }
     if (typeof data === 'string') {
-      return Buffer.from(data); // Assume string is UTF-8 encoded string
+      // Return string directly to avoid Buffer conversion overhead for large content
+      return data;
     }
     return null;
   }

test/scripts/hexo/router.ts

@@ -174,6 +174,14 @@ describe('Router', () => {
     return checkStream(router.get('test'), JSON.stringify(obj));
   });
 
+  it('get() - large string content should not be converted to Buffer unnecessarily', () => {
+    const largeString = 'a'.repeat(100000); // 100KB string
+
+    router.set('test', largeString);
+
+    return checkStream(router.get('test'), largeString);
+  });
+
   it('list()', () => {
     const router = new Router();