なんかもうめっちゃ変えた

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

@@ -0,0 +1,13 @@
+export function query(obj: Record<string, unknown>): string {
+	const params = Object.entries(obj)
+		.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)
+		.reduce((a, [k, v]) => (a[k] = v, a), {} as Record<string, any>);
+
+	return Object.entries(params)
+		.map((e) => `${e[0]}=${encodeURIComponent(e[1])}`)
+		.join('&');
+}
+
+export function appendQuery(url: string, query: string): string {
+	return `${url}${/\?/.test(url) ? url.endsWith('?') ? '' : '&' : '?'}${query}`;
+}