diff --git a/packages/frontend-misskey-world-engine/src/room/engine.ts b/packages/frontend-misskey-world-engine/src/room/engine.ts
index c93e9c8d81..62c9ce1dbc 100644
--- a/packages/frontend-misskey-world-engine/src/room/engine.ts
+++ b/packages/frontend-misskey-world-engine/src/room/engine.ts
@@ -21,6 +21,7 @@ import { cm, WORLD_SCALE } from 'misskey-world/src/utility.js';
 import { TIME_MAP, getMeshesBoundingBox, Timer, getYRotationDirection, FreeCameraManualInput, remap } from '../utility.js';
 import { EngineBase } from '../EngineBase.js';
 import { genId } from '../id.js';
+import { deepClone } from '../clone.js';
 import { getObjectDef } from './object-defs.js';
 import { findMaterial, GRAPHICS_QUALITY, ModelManager, SYSTEM_HEYA_MESH_NAMES, SYSTEM_MESH_NAMES } from './utility.js';
 import { JapaneseEnvManager, MuseumEnvManager, SimpleEnvManager } from './env.js';
@@ -30,7 +31,6 @@ import type { GridMaterial } from '@babylonjs/materials';
 import type { EnvManager } from './env.js';
 import type { RoomStateObject } from 'misskey-world/src/room/object.js';
 import type { RoomAttachments, RoomState } from 'misskey-world/src/room/type.js';
-import type { deepClone } from '../clone.js';
 
 const BAKE_TRANSFORM = false; // 実験的
 const IGNORE_OBJECTS: string[] = ['aquarium']; // for debug
diff --git a/packages/frontend-misskey-world-engine/src/room/env.ts b/packages/frontend-misskey-world-engine/src/room/env.ts
index 70cbc19e29..3d3c554f9c 100644
--- a/packages/frontend-misskey-world-engine/src/room/env.ts
+++ b/packages/frontend-misskey-world-engine/src/room/env.ts
@@ -5,6 +5,7 @@
  */
 
 import * as BABYLON from '@babylonjs/core';
+import { cm, WORLD_SCALE } from 'misskey-world/src/utility.js';
 import { findMaterial, GRAPHICS_QUALITY, SYSTEM_HEYA_MESH_NAMES } from './utility.js';
 import type { RoomEngine } from './engine.js';
 import type { SimpleEnvOptions, JapaneseEnvOptions, MuseumEnvOptions } from 'misskey-world/src/room/type.js';
diff --git a/packages/frontend-misskey-world-engine/src/room/previewEngine.ts b/packages/frontend-misskey-world-engine/src/room/previewEngine.ts
index 297634b381..2b9e944843 100644
--- a/packages/frontend-misskey-world-engine/src/room/previewEngine.ts
+++ b/packages/frontend-misskey-world-engine/src/room/previewEngine.ts
@@ -10,10 +10,13 @@ import { cm, WORLD_SCALE } from 'misskey-world/src/utility.js';
 import { camelToKebab } from 'misskey-world/src/utility.js';
 import { getMeshesBoundingBox, ArcRotateCameraManualInput } from '../utility.js';
 import { EngineBase } from '../EngineBase.js';
+import { deepClone } from '../clone.js';
+import { genId } from '../id.js';
 import { getObjectDef } from './object-defs.js';
 import { SYSTEM_MESH_NAMES, GRAPHICS_QUALITY } from './utility.js';
 import { ObjectContainer } from './ObjectContainer.js';
 import type { RawOptions } from './object.js';
+import type { RoomAttachments } from 'misskey-world/src/room/type.js';
 
 export class RoomObjectPreviewEngine extends EngineBase<{
 	'loadingProgress': (ctx: { progress: number }) => void;
diff --git a/packages/frontend/src/world/engineControllerBase.ts b/packages/frontend/src/world/engineControllerBase.ts
index f9de3a6d1e..9ac80c06ee 100644
--- a/packages/frontend/src/world/engineControllerBase.ts
+++ b/packages/frontend/src/world/engineControllerBase.ts
@@ -97,14 +97,6 @@ export abstract class EngineControllerBase<T extends EngineBase<EngineBaseEvents
 
 			this.initializeProgress.value = 1;
 			this.isReady.value = true;
-
-			if (_DEV_) {
-				(window as any).showBabylonInspector = () => {
-					import('@babylonjs/inspector').then(({ ShowInspector }) => {
-						ShowInspector(this.engine!.scene);
-					});
-				};
-			}
 		}
 
 		this.canvas.addEventListener('keydown', (ev) => {