From 1590a73d3d38a24fc9d05862dd9e1103041d943e Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Wed, 26 Nov 2025 20:40:20 +0900
Subject: [PATCH] =?UTF-8?q?perf(backend):=20=E5=BF=85=E8=A6=81=E3=81=AB?=
 =?UTF-8?q?=E3=81=AA=E3=82=8B=E3=81=BE=E3=81=A7nsfwjs=E3=82=92=E8=AA=AD?=
 =?UTF-8?q?=E3=81=BF=E8=BE=BC=E3=81=BE=E3=81=AA=E3=81=84=E3=82=88=E3=81=86?=
 =?UTF-8?q?=E3=81=AB?=
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---
 packages/backend/src/core/AiService.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/packages/backend/src/core/AiService.ts b/packages/backend/src/core/AiService.ts
index 23ab8082ed..7a005400bb 100644
--- a/packages/backend/src/core/AiService.ts
+++ b/packages/backend/src/core/AiService.ts
@@ -7,11 +7,11 @@ import * as fs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname } from 'node:path';
 import { Injectable } from '@nestjs/common';
-import * as nsfw from 'nsfwjs';
 import si from 'systeminformation';
 import { Mutex } from 'async-mutex';
 import fetch from 'node-fetch';
 import { bindThis } from '@/decorators.js';
+import type { NSFWJS, PredictionType } from 'nsfwjs';
 
 const _filename = fileURLToPath(import.meta.url);
 const _dirname = dirname(_filename);
@@ -21,7 +21,7 @@ let isSupportedCpu: undefined | boolean = undefined;
 
 @Injectable()
 export class AiService {
-	private model: nsfw.NSFWJS;
+	private model: NSFWJS;
 	private modelLoadMutex: Mutex = new Mutex();
 
 	constructor(
@@ -29,7 +29,7 @@ export class AiService {
 	}
 
 	@bindThis
-	public async detectSensitive(source: string | Buffer): Promise<nsfw.PredictionType[] | null> {
+	public async detectSensitive(source: string | Buffer): Promise<PredictionType[] | null> {
 		try {
 			if (isSupportedCpu === undefined) {
 				isSupportedCpu = await this.computeIsSupportedCpu();
@@ -44,6 +44,7 @@ export class AiService {
 			tf.env().global.fetch = fetch;
 
 			if (this.model == null) {
+				const nsfw = await import('nsfwjs');
 				await this.modelLoadMutex.runExclusive(async () => {
 					if (this.model == null) {
 						this.model = await nsfw.load(`file://${_dirname}/../../nsfw-model/`, { size: 299 });