fix(ext/node): add default methods to fs.StatsBase (#22750)

ext/node/polyfills/_fs/_fs_stat.ts

@@ -109,6 +109,28 @@ class StatsBase {
     this.size = size;
     this.blocks = blocks;
   }
+
+  isFile() {
+    return false;
+  }
+  isDirectory() {
+    return false;
+  }
+  isSymbolicLink() {
+    return false;
+  }
+  isBlockDevice() {
+    return false;
+  }
+  isFIFO() {
+    return false;
+  }
+  isCharacterDevice() {
+    return false;
+  }
+  isSocket() {
+    return false;
+  }
 }
 
 // The Date constructor performs Math.floor() to the timestamp.

tests/unit_node/_fs/_fs_stat_test.ts

@@ -129,3 +129,17 @@ Deno.test("[std/node/fs] stat callback isn't called twice if error is thrown", a
     },
   });
 });
+
+Deno.test({
+  name: "[std/node/fs] stat default methods",
+  fn() {
+    const stats = new Stats();
+    assertEquals(stats.isFile(), false);
+    assertEquals(stats.isDirectory(), false);
+    assertEquals(stats.isBlockDevice(), false);
+    assertEquals(stats.isCharacterDevice(), false);
+    assertEquals(stats.isSymbolicLink(), false);
+    assertEquals(stats.isFIFO(), false);
+    assertEquals(stats.isSocket(), false);
+  },
+});