import type { SessionAuthContext } from "#channel/types.js";
import type { TurnStepPayload } from "#execution/session/turn-step-types.js";
/** Every anonymous caller shares this one principal. */
export declare const ANONYMOUS_PRINCIPAL = "anonymous";
/**
 * Stable key for the principal a session identity acts as: only a turn's own
 * principal steers it, and one principal's queued messages share a turn.
 */
export declare function principalOf(auth: SessionAuthContext | null | undefined): string;
/**
 * The principal of the delivery that starts or continues a turn. A delivery
 * without auth keeps the session's current identity, as the turn step does.
 */
export declare function resolveTurnPrincipal(payload: TurnStepPayload | undefined, serializedContext: Record<string, unknown>): string;