[NOT TO MERGE] Support to get the RMW implementation identifier

lib/node.js

@@ -1610,6 +1610,14 @@ class Node extends rclnodejs.ShadowNode {
     }
   }
 
+  /**
+   * Get the RMW implementation identifier
+   * @returns {string} - The RMW implementation identifier.
+   */
+  getRMWImplementationIdentifier() {
+    return rclnodejs.getRMWImplementationIdentifier();
+  }
+
   // returns on 1st error or result {successful, reason}
   _validateParameters(parameters = [], declareParameterMode = false) {
     for (const parameter of parameters) {

src/rcl_node_bindings.cpp

@@ -419,6 +419,10 @@ Napi::Value GetNodeNames(const Napi::CallbackInfo& info) {
   return result_list;
 }
 
+Napi::Value GetRMWImplementationIdentifier(const Napi::CallbackInfo& info) {
+  return Napi::String::New(info.Env(), rmw_get_implementation_identifier());
+}
+
 Napi::Object InitNodeBindings(Napi::Env env, Napi::Object exports) {
   exports.Set("getParameterOverrides",
               Napi::Function::New(env, GetParameterOverrides));
@@ -439,6 +443,8 @@ Napi::Object InitNodeBindings(Napi::Env env, Napi::Object exports) {
   exports.Set("countServices", Napi::Function::New(env, CountServices));
 #endif
   exports.Set("getNodeNames", Napi::Function::New(env, GetNodeNames));
+  exports.Set("getRMWImplementationIdentifier",
+              Napi::Function::New(env, GetRMWImplementationIdentifier));
   return exports;
 }
 

test/test-node.js

@@ -544,4 +544,9 @@ describe('Test the node with no handles attached when initializing', function ()
       );
     }, 100);
   });
+
+  it('Get RMW identifier', function () {
+    const node = rclnodejs.createNode('rmw', '/rmw_getter');
+    assert.notStrictEqual(node.getRMWImplementationIdentifier().length, 0);
+  });
 });

test/types/index.test-d.ts

@@ -76,6 +76,7 @@ expectType<number>(node.countServices(SERVICE_NAME));
 expectType<rclnodejs.Options<string | rclnodejs.QoS>>(
   rclnodejs.Node.getDefaultOptions()
 );
+expectType<string>(node.getRMWImplementationIdentifier());
 
 // ---- LifecycleNode ----
 const lifecycleNode = rclnodejs.createLifecycleNode(LIFECYCLE_NODE_NAME);

types/node.d.ts

@@ -796,5 +796,11 @@ declare module 'rclnodejs' {
      * @returns Number of services.
      */
     countServices(serviceName: string): number;
+
+    /**
+     * Get the RMW implementation identifier
+     * @returns - The RMW implementation identifier.
+     */
+    getRMWImplementationIdentifier(): string;
   }
 }