import { type SessionState } from '../../../core/session-model/session-state.js';
import type { BrokerToClient, ClientRole } from '../../../core/runtime/broker-protocol.js';
/** The repaints a state delta can trigger. Each is a lazy closure so the
 *  collaborators that answer them may be built after this owner. */
export interface StateSyncEffects {
    /** Feed engine state to the input controller — steer-vs-prompt routing reads
     *  `isStreaming`, so it must stay current. */
    setEngineState: (engine: NonNullable<SessionState['engine']>) => void;
    /** The task name lives in the editor's top border; the border color tracks
     *  the agent's thinking level. Both follow live state. */
    setEditorTitle: (name: string | undefined) => void;
    paintEditorFrame: () => void;
    renderExtensionWidgets: () => void;
    renderQueued: () => void;
    renderFooter: () => void;
    setTerminalTitle: (title: string) => void;
    /** Panel liveness rides the relayed event stream (agent_start/agent_end/
     *  queue_update/session_info_changed all move engine state) plus the viewer's
     *  low-rate poll for changes that emit no event (child status flips). */
    refreshChrome: () => void;
}
export interface SessionStateSync {
    /** The live folded state. Read it; never hold it across an await. */
    state: () => SessionState;
    /** Fold one broker frame through the shared reducer and repaint the slices
     *  that actually changed. */
    fold: (frame: BrokerToClient) => void;
    /** The ONE place this viewer writes session state without a broker frame: an
     *  idle-released broker has settled its turn and will relay no final event,
     *  so the viewer must clear the live-only spinner itself. Everything else
     *  must go through `fold`. */
    patchLocal: (patch: Partial<NonNullable<SessionState['engine']>>) => void;
    /** The combined model + thinking-level label a model/thinking change
     *  announces (e.g. "sonnet medium", "fable x high"). Reads live state, so
     *  callers fold first, then notice. `off` collapses to the bare model name. */
    modelThinkingLabel: () => string | undefined;
}
export declare function createSessionStateSync(role: ClientRole, clientId: string, fx: StateSyncEffects): SessionStateSync;