[TypeScript] Add declaration for removeSignalHandlers() (#1023)

This patch adds the declaration for removeSignalHandlers() method into
index.d.ts.

Fix: #1022

Author: minggangw

test/types/main.ts

@@ -21,6 +21,9 @@ rclnodejs.isShutdown();
 // $ExpectType void
 rclnodejs.shutdown();
 
+// $ExpectType void
+rclnodejs.removeSignalHandlers();
+
 // ---- DistroUtil ----
 
 // $ExpectType DistroId

types/index.d.ts

@@ -144,6 +144,13 @@ declare module 'rclnodejs' {
     type: T
   ): MessageType<T>;
 
+  /**
+   * Removes the default signal handler installed by rclnodejs. After calling this, rclnodejs
+   * will no longer clean itself up when a SIGINT is received, it is the application's
+   * responsibility to properly shut down all nodes and contexts.
+   */
+  function removeSignalHandlers(): void;
+
   /**
    * Get a list of action names and types for action clients associated with a node.
    * @param node - The node used for discovery.