import { Rumor, SessionState, ReactionPayload, ReceiptPayload, ReceiptType, ExpirationOptions } from "./types";
import type { Session } from "./Session.ts";
export declare function serializeSessionState(state: SessionState): string;
export declare function deserializeSessionState(data: string): SessionState;
export declare function deepCopyState(s: SessionState): SessionState;
export declare function createEventStream(session: Session): AsyncGenerator<Rumor, void, unknown>;
export declare function kdf(input1: Uint8Array, input2?: Uint8Array, numOutputs?: number): Uint8Array[];
export declare function getMillisecondTimestamp(event: Rumor): number;
export declare function resolveExpirationSeconds(options: ExpirationOptions | undefined, nowSeconds: number): number | undefined;
export declare function upsertExpirationTag(tags: string[][], expiresAtSeconds: number): void;
export declare function getExpirationTimestampSeconds(event: {
    tags?: string[][];
}): number | undefined;
export declare function isExpired(event: {
    tags?: string[][];
}, nowSeconds: number): boolean;
/**
 * Parse a reaction from a rumor event.
 * Reactions are identified by kind 7 with emoji in content and messageId in ["e", ...] tag.
 * @param rumor An event-like object with kind, content, and tags
 * @returns The parsed ReactionPayload if valid, null otherwise
 */
export declare function parseReaction(rumor: {
    kind: number;
    content: string;
    tags?: string[][];
}): ReactionPayload | null;
/**
 * Check if a rumor event is a reaction.
 * @param rumor An event-like object with at least a kind field
 * @returns true if the event is a reaction
 */
export declare function isReaction(rumor: {
    kind: number;
}): boolean;
export declare function isReceiptType(value: string): value is ReceiptType;
export declare function shouldAdvanceReceiptStatus(current: ReceiptType | undefined, incoming: ReceiptType): boolean;
export declare function parseReceipt(rumor: {
    kind: number;
    content: string;
    tags?: string[][];
}): ReceiptPayload | null;
export declare function isTyping(rumor: {
    kind: number;
}): boolean;
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