misskey/packages/backend/src/misc/is-instance-muted.ts

import type { Packed } from 'misskey-js';

export function isInstanceMuted(note: Packed<'Note'>, mutedInstances: Set<string>): boolean {
	if (mutedInstances.has(note.user.host ?? '')) return true;
	if (mutedInstances.has(note.reply?.user.host ?? '')) return true;
	if (mutedInstances.has(note.renote?.user.host ?? '')) return true;

	return false;
}

export function isUserFromMutedInstance(notif: Packed<'Notification'>, mutedInstances: Set<string>): boolean {
	if (mutedInstances.has(notif.user?.host ?? '')) return true;

	return false;
}