backend: fix lints in various misc modules

Mostly adding return types and also fixing a type error.

packages/backend/src/misc/cache.ts

@@ -29,7 +29,7 @@ export class Cache<T> {
 		return cached.value;
 	}
 
-	public delete(key: string | null) {
+	public delete(key: string | null): void {
 		this.cache.delete(key);
 	}
 
@@ -46,8 +46,9 @@ export class Cache<T> {
 			const value = await this.fetcher(key);
 
 			// don't cache undefined
-			if (value !== undefined)
+			if (value !== undefined) {
 				this.set(key, value);
+			}
 
 			return value;
 		}

packages/backend/src/misc/captcha.ts

@@ -3,7 +3,7 @@ import fetch from 'node-fetch';
 import config from '@/config/index.js';
 import { getAgentByUrl } from './fetch.js';
 
-export async function verifyRecaptcha(secret: string, response: string) {
+export async function verifyRecaptcha(secret: string, response: string): Promise<void> {
 	const result = await getCaptchaResponse('https://www.recaptcha.net/recaptcha/api/siteverify', secret, response).catch(e => {
 		throw new Error(`recaptcha-request-failed: ${e.message}`);
 	});
@@ -14,7 +14,7 @@ export async function verifyRecaptcha(secret: string, response: string) {
 	}
 }
 
-export async function verifyHcaptcha(secret: string, response: string) {
+export async function verifyHcaptcha(secret: string, response: string): Promise<void> {
 	const result = await getCaptchaResponse('https://hcaptcha.com/siteverify', secret, response).catch(e => {
 		throw new Error(`hcaptcha-request-failed: ${e.message}`);
 	});

packages/backend/src/misc/check-word-mute.ts

@@ -5,6 +5,7 @@ import { User } from '@/models/entities/user.js';
 type NoteLike = {
 	userId: Note['userId'];
 	text: Note['text'];
+	cw: Note['cw'];
 };
 
 type UserLike = {

packages/backend/src/misc/convert-host.ts

@@ -11,12 +11,12 @@ export function isSelfHost(host: string | null): boolean {
 	return toPuny(config.host) === toPuny(host);
 }
 
-export function extractDbHost(uri: string) {
+export function extractDbHost(uri: string): string {
 	const url = new URL(uri);
 	return toPuny(url.hostname);
 }
 
-export function toPuny(host: string) {
+export function toPuny(host: string): string {
 	return toASCII(host.toLowerCase());
 }
 

packages/backend/src/misc/detect-url-mime.ts

@@ -2,7 +2,7 @@ import { createTemp } from './create-temp.js';
 import { downloadUrl } from './download-url.js';
 import { detectType } from './get-file-info.js';
 
-export async function detectUrlMime(url: string) {
+export async function detectUrlMime(url: string): Promise<string> {
 	const [path, cleanup] = await createTemp();
 
 	try {