diff --git a/packages/graph/src/graph/chunk-graph/graph.ts b/packages/graph/src/graph/chunk-graph/graph.ts
index 570a1ae8..27576a2c 100644
--- a/packages/graph/src/graph/chunk-graph/graph.ts
+++ b/packages/graph/src/graph/chunk-graph/graph.ts
@@ -1,74 +1,68 @@
 import { SDK } from '@rsdoctor/types';
 
 export class ChunkGraph implements SDK.ChunkGraphInstance {
-  private _assets: SDK.AssetInstance[] = [];
-  private _chunks: SDK.ChunkInstance[] = [];
-  private _entrypoints: SDK.EntryPointInstance[] = [];
-  private _assetMap: Record<string, SDK.AssetInstance> = {};
-  private _chunkMap: Record<string, SDK.ChunkInstance> = {};
-  private _entrypointMap: Record<string, SDK.EntryPointInstance> = {};
+  private _assetMap: Map<string, SDK.AssetInstance> = new Map();
+  private _chunkMap: Map<string, SDK.ChunkInstance> = new Map();
+  private _entrypointMap: Map<string, SDK.EntryPointInstance> = new Map();
 
   getAssets(): SDK.AssetInstance[] {
-    return this._assets.slice();
+    return Array.from(this._assetMap.values());
   }
 
   getChunks(): SDK.ChunkInstance[] {
-    return this._chunks.slice();
+    return Array.from(this._chunkMap.values());
   }
 
   addAsset(...assets: SDK.AssetInstance[]): void {
     assets.forEach((asset) => {
-      if (!this._assets.includes(asset)) {
-        this._assets.push(asset);
-        this._assetMap[asset.path] = asset;
-      }
+      this._assetMap.set(asset.path, asset);
     });
   }
 
   addChunk(...chunks: SDK.ChunkInstance[]): void {
     chunks.forEach((chunk) => {
-      if (!this._chunks.includes(chunk)) {
-        this._chunks.push(chunk);
-        this._chunkMap[chunk.id] = chunk;
-      }
+      this._chunkMap.set(chunk.id, chunk);
     });
   }
 
   getChunkById(id: string): SDK.ChunkInstance | undefined {
-    return this._chunkMap[id];
+    return this._chunkMap.get(id);
   }
 
   getChunkByModule(module: SDK.ModuleInstance): SDK.ChunkInstance | undefined {
-    return this._chunks.find((item) => item.hasModule(module));
+    return Array.from(this._chunkMap.values()).find((item) =>
+      item.hasModule(module),
+    );
   }
 
   getAssetByPath(path: string): SDK.AssetInstance | undefined {
-    return this._assetMap[path];
+    return this._assetMap.get(path);
   }
 
   getEntryPoints(): SDK.EntryPointInstance[] {
-    return this._entrypoints.slice();
+    return Array.from(this._entrypointMap.values());
   }
 
   getEntryPointByName(name: string): SDK.EntryPointInstance | undefined {
-    return this._entrypointMap[name];
+    return this._entrypointMap.get(name);
   }
 
   addEntryPoint(...entrypoints: SDK.EntryPointInstance[]): void {
     entrypoints.forEach((entrypoint) => {
-      if (!this._entrypoints.includes(entrypoint)) {
-        this._entrypoints.push(entrypoint);
-        this._entrypointMap[entrypoint.name] = entrypoint;
-      }
+      this._entrypointMap.set(entrypoint.name, entrypoint);
     });
   }
 
   /** output the chunk graph data */
   toData(type: SDK.ToDataType): SDK.ChunkGraphData {
     return {
-      assets: this._assets.map((item) => item.toData(type)),
-      chunks: this._chunks.map((item) => item.toData()),
-      entrypoints: this._entrypoints.map((item) => item.toData()),
+      assets: Array.from(this._assetMap.values()).map((item) =>
+        item.toData(type),
+      ),
+      chunks: Array.from(this._chunkMap.values()).map((item) => item.toData()),
+      entrypoints: Array.from(this._entrypointMap.values()).map((item) =>
+        item.toData(),
+      ),
     };
   }
 }