File.stat().

test/io/file/size_static.wren

@@ -0,0 +1,13 @@
+import "io" for File
+import "scheduler" for Scheduler
+
+System.print(File.size("test/io/file/file.txt")) // expect: 19
+
+// Runs asynchronously.
+Scheduler.add {
+  System.print("async")
+}
+
+System.print(File.size("test/io/file/file.txt"))
+// expect: async
+// expect: 19