import type { Payload, Symbol } from './types.js';
/**
 * Session tracks symbols that have been transmitted to a client, enabling
 * subsequent responses to reference them by ID without full retransmission.
 * This makes multi-call workflows progressively cheaper.
 */
export declare class Session {
    private symbols;
    private nextID;
    /** Returns true if the symbol has been sent in a previous response. */
    transmitted(qname: string): boolean;
    /** Returns the session-global ID for a previously transmitted symbol, or -1 if not found. */
    getID(qname: string): number;
    /**
     * Record marks symbols as transmitted and assigns session-global IDs.
     * Call this after a successful encode to register newly-sent symbols.
     */
    record(symbols: Symbol[]): void;
    /** Returns the number of symbols tracked in this session. */
    size(): number;
    /** Returns the next available session ID without consuming it. */
    nextSessionID(): number;
    /** Clears the session state. */
    reset(): void;
}
/**
 * Encode a payload using GCF with session deduplication.
 * Symbols that were already transmitted in prior responses are emitted as
 * bare references (`@N  # previously transmitted`) instead of full declarations.
 * After encoding, newly-sent symbols are recorded in the session.
 */
export declare function encodeWithSession(p: Payload, sess: Session | null): string;
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