diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 00000000..68b1e887
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,22 @@
+declare namespace Pinpoint {
+    export interface Agent {
+        start(initOptions: any);
+        initializeDataSender(): void;
+        initializeSupportModules(): void;
+        initializePinpointClient(): void;
+        createTraceObject(requestData: any): Trace;
+        currentTraceObject(): any;
+        completeTraceObject(trace: any): void;
+        createAgentInfo(config: any, agentStartTime: any): AgentInfo;
+        startSchedule(agentId: any, agentStartTime: any): void;
+        spanEndCallbackWrapper(trace: any, spanEventRecorder: any, original: any): any;
+    }
+
+    export interface Trace {
+    }
+
+    export interface AgentInfo {
+    }
+}
+declare const pinpointAgent: Pinpoint.Agent;
+export = pinpointAgent;
\ No newline at end of file
diff --git a/lib/agent.js b/lib/agent.js
index 0a04f635..b4beae91 100644
--- a/lib/agent.js
+++ b/lib/agent.js
@@ -48,7 +48,7 @@ class Agent {
     apiMetaService.init(this.dataSender)
 
     this.startSchedule(agentId, agentStartTime)
-    this.initailizeSupportModules()
+    this.initializeSupportModules()
 
     log.warn('[Pinpoint Agent][' + agentId + '] Init Completed')
   }
@@ -58,7 +58,7 @@ class Agent {
     this.dataSender.send(this.agentInfo)
   }
 
-  initailizeSupportModules() {
+  initializeSupportModules() {
     this.moduleHook = new ModuleHook(this)
   }