Use promises API (#11351)

packages/backend/src/core/DownloadService.ts

 import * as fs from 'node:fs';
-import * as stream from 'node:stream';
-import * as util from 'node:util';
+import * as stream from 'node:stream/promises';
 import { Inject, Injectable } from '@nestjs/common';
 import ipaddr from 'ipaddr.js';
 import chalk from 'chalk';
@@ -14,7 +13,6 @@ import { StatusError } from '@/misc/status-error.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import type Logger from '@/logger.js';
 
-const pipeline = util.promisify(stream.pipeline);
 import { bindThis } from '@/decorators.js';
 
 @Injectable()
@@ -102,7 +100,7 @@ export class DownloadService {
 		});
 
 		try {
-			await pipeline(req, fs.createWriteStream(path));
+			await stream.pipeline(req, fs.createWriteStream(path));
 		} catch (e) {
 			if (e instanceof Got.HTTPError) {
 				throw new StatusError(`${e.response.statusCode} ${e.response.statusMessage}`, e.response.statusCode, e.response.statusMessage);
@@ -129,7 +127,7 @@ export class DownloadService {
 			// write content at URL to temp file
 			await this.downloadUrl(url, path);
 
-			const text = await util.promisify(fs.readFile)(path, 'utf8');
+			const text = await fs.promises.readFile(path, 'utf8');
 
 			return text;
 		} finally {

packages/backend/src/core/FileInfoService.ts

 import * as fs from 'node:fs';
 import * as crypto from 'node:crypto';
 import { join } from 'node:path';
-import * as stream from 'node:stream';
-import * as util from 'node:util';
+import * as stream from 'node:stream/promises';
 import { Injectable } from '@nestjs/common';
 import { FSWatcher } from 'chokidar';
 import * as fileType from 'file-type';
@@ -16,8 +15,6 @@ import { createTempDir } from '@/misc/create-temp.js';
 import { AiService } from '@/core/AiService.js';
 import { bindThis } from '@/decorators.js';
 
-const pipeline = util.promisify(stream.pipeline);
-
 export type FileInfo = {
 	size: number;
 	md5: string;
@@ -371,8 +368,7 @@ export class FileInfoService {
 	 */
 	@bindThis
 	public async getFileSize(path: string): Promise<number> {
-		const getStat = util.promisify(fs.stat);
-		return (await getStat(path)).size;
+		return (await fs.promises.stat(path)).size;
 	}
 
 	/**
@@ -381,7 +377,7 @@ export class FileInfoService {
 	@bindThis
 	private async calcHash(path: string): Promise<string> {
 		const hash = crypto.createHash('md5').setEncoding('hex');
-		await pipeline(fs.createReadStream(path), hash);
+		await stream.pipeline(fs.createReadStream(path), hash);
 		return hash.read();
 	}
 

packages/backend/src/server/api/ApiCallService.ts

 import { randomUUID } from 'node:crypto';
-import { pipeline } from 'node:stream';
 import * as fs from 'node:fs';
-import { promisify } from 'node:util';
+import * as stream from 'node:stream/promises';
 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
 import { getIpHash } from '@/misc/get-ip-hash.js';
@@ -21,8 +20,6 @@ import type { FastifyRequest, FastifyReply } from 'fastify';
 import type { OnApplicationShutdown } from '@nestjs/common';
 import type { IEndpointMeta, IEndpoint } from './endpoints.js';
 
-const pump = promisify(pipeline);
-
 const accessDenied = {
 	message: 'Access denied.',
 	code: 'ACCESS_DENIED',
@@ -138,7 +135,7 @@ export class ApiCallService implements OnApplicationShutdown {
 		}
 
 		const [path] = await createTemp();
-		await pump(multipartData.file, fs.createWriteStream(path));
+		await stream.pipeline(multipartData.file, fs.createWriteStream(path));
 
 		const fields = {} as Record<string, unknown>;
 		for (const [k, v] of Object.entries(multipartData.fields)) {