import { type E4Attribution, type E6Attribution } from './midturn-terminality.js';
export type Settlement = 'held' | 'inflight' | 'awaiting' | 'fallback_running' | 'presumed_lost' | 'steered' | 'answered' | 'lost' | 'void';
export type Cause = 'conn_terminal' | 'conversation_gone' | 'session_switched' | 'escape_hatch' | 'delivery_failed' | 'sent_plain' | 'abort_dropped';
export interface MidTurnState {
    settlement: Settlement;
    sawHostFinish: boolean;
    epoch: number;
    steeredAtMs?: number;
    cause?: Cause;
}
export type SettlementEvent = {
    type: 'E1';
    steeredAtMs: number;
} | {
    type: 'E2';
} | {
    type: 'E3';
    kind: 'finish' | 'error';
    reason?: string;
} | {
    type: 'E4';
    attribution: E4Attribution;
} | {
    type: 'E5';
} | {
    type: 'E6';
    attribution: E6Attribution;
} | {
    type: 'E7';
} | {
    type: 'E8';
    cause: 'conversation_gone' | 'session_switched';
} | {
    type: 'E9';
} | {
    type: 'E10';
} | {
    type: 'E11';
} | {
    type: 'E12';
};
export declare const TERMINAL: ReadonlySet<Settlement>;
export declare const initialInflight: (epoch: number) => MidTurnState;
export declare const initialHeld: (epoch: number) => MidTurnState;
export declare const toVoidSentPlain: (p: MidTurnState) => MidTurnState;
export declare function reduceMidTurnSettlement(p: MidTurnState, ev: SettlementEvent): MidTurnState;
export declare const leftInflight: (prev: MidTurnState, next: MidTurnState) => boolean;
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