enhance: Proxy custom emojis to reduce image size and accelerate the frontend (#9431)

* fix(server): /emoji to accept `@.` host expression

* fix(client): use MkEmoji for custom emoji in MkEmojiPicker

* change convertToWebp

* nanka iroiro

* remove

* fix

* nearLosslessは労多くして益少なしなのでやめる

* do not cleanup tmp for development

* update sharp.js to 0.31.3

* mixed: true

* fix MkAutocomplete of 912791b3ab

* clean up

* https://github.com/misskey-dev/misskey/pull/9431#discussion_r1059215943

packages/backend/src/misc/create-temp.ts

@@ -4,7 +4,7 @@ export function createTemp(): Promise<[string, () => void]> {
 	return new Promise<[string, () => void]>((res, rej) => {
 		tmp.file((e, path, fd, cleanup) => {
 			if (e) return rej(e);
-			res([path, cleanup]);
+			res([path, process.env.NODE_ENV === 'production' ? cleanup : () => {}]);
 		});
 	});
 }
@@ -17,7 +17,7 @@ export function createTempDir(): Promise<[string, () => void]> {
 			},
 			(e, path, cleanup) => {
 				if (e) return rej(e);
-				res([path, cleanup]);
+				res([path, process.env.NODE_ENV === 'production' ? cleanup : () => {}]);
 			},
 		);
 	});

packages/backend/src/misc/prelude/url.ts

@@ -1,3 +1,8 @@
+/* objを検査して
+ * 1. 配列に何も入っていない時はクエリを付けない
+ * 2. プロパティがundefinedの時はクエリを付けない
+ * （new URLSearchParams(obj)ではそこまで丁寧なことをしてくれない）
+ */ 
 export function query(obj: Record<string, unknown>): string {
 	const params = Object.entries(obj)
 		.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)