lib-common: Add JsRunnable

jacline-lib-common/src/main/java/com/kohlschutter/jacline/lib/common/JsRunnable.java

@@ -0,0 +1,32 @@
+/*
+ * jacline-lib-common
+ *
+ * Copyright 2023 Christian Kohlschütter
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.kohlschutter.jacline.lib.common;
+
+import jsinterop.annotations.JsFunction;
+
+/**
+ * A Javascript-native callback function with no arguments.
+ */
+@JsFunction
+@FunctionalInterface
+public interface JsRunnable {
+  /**
+   * Execute something.
+   */
+  void run();
+}