import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Reports whether a ringing or joined participant may signal within the matching ringing or active call and chat, optionally to an eligible recipient.
 * Checking both endpoints against current participation state prevents signaling across calls or toward users who already left.
 */
export declare function callCanSignal(executor: DrizzleExecutor, input: {
    userId: string;
    callId: string;
    chatId: string;
    recipientUserId?: string;
}): Promise<boolean>;
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