Add isServiceProvider() util

packages/support/src/services/index.ts

@@ -3,5 +3,6 @@ export {
     ServiceProvider,
 }
 
+export * from "./isServiceProvider";
 export * from "./isServiceProviderConstructor";
 export * from "./ServiceProviderClassBlueprint"

packages/support/src/services/isServiceProvider.ts

@@ -0,0 +1,27 @@
+import { isset } from "@aedart/support/misc";
+import { isServiceProviderConstructor } from "./isServiceProviderConstructor";
+import ServiceProvider from "./ServiceProvider";
+
+/**
+ * Determine if given object is a [ServiceProvider]{@link import('@aedart/contracts/support/services').ServiceProvider}
+ * 
+ * @param {object} instance
+ * 
+ * @returns {boolean}
+ */
+export function isServiceProvider(instance: object): boolean
+{
+    if (!isset(instance) || typeof instance !== 'object') {
+        return false;
+    }
+
+    if (instance instanceof ServiceProvider) {
+        return true;
+    }
+
+    if (!Reflect.has(instance, 'constructor')) {
+        return false;
+    }
+
+    return isServiceProviderConstructor(instance.constructor);
+}