/**
 * Session domain state, tracks the active host session lifecycle,
 * recovery machine state, lineage, and identity metadata.
 */
/** States for the session recovery machine. */
export type SessionRecoveryState = 'loading' | 'repairing' | 'reconciling' | 'ready' | 'failed';
/** States representing overall session status. */
export type SessionStatus = 'initializing' | 'active' | 'suspended' | 'terminating' | 'terminated';
/**
 * Snapshot of a session lineage entry, used for branching/resume tracking.
 */
export interface SessionLineageEntry {
    /** Session ID in the lineage chain. */
    sessionId: string;
    /** Timestamp when this lineage node was created. */
    createdAt: number;
    /** Optional parent session ID (undefined = root). */
    parentId?: string | undefined;
    /** Reason this session was branched or resumed. */
    branchReason?: 'resume' | 'fork' | 'repair' | 'compaction' | undefined;
}
/**
 * SessionDomainState, full session context including recovery state machine.
 */
export interface SessionDomainState {
    /** Monotonic revision counter; increments on every mutation. */
    revision: number;
    /** Timestamp of last mutation (Date.now()). */
    lastUpdatedAt: number;
    /** Subsystem that triggered the last mutation. */
    source: string;
    /** Unique session identifier (ulid/uuid). */
    id: string;
    /** Absolute path to the project root for this session. */
    projectRoot: string;
    /** Optional user identifier (from config or auth layer). */
    userId?: string | undefined;
    /** Current overall session status. */
    status: SessionStatus;
    /** Epoch ms when the session was started. */
    startedAt: number;
    /** Epoch ms when the session ended (undefined while active). */
    endedAt?: number | undefined;
    /** Current state of the session recovery state machine. */
    recoveryState: SessionRecoveryState;
    /** Whether this session was resumed from a saved state. */
    isResumed: boolean;
    /** ID of the session that was resumed (undefined for fresh sessions). */
    resumedFromId?: string | undefined;
    /** Whether a compaction repair was applied during load. */
    wasRepaired: boolean;
    /** Error message if recoveryState === 'failed'. */
    recoveryError?: string | undefined;
    /** The root session ID in the lineage chain (equals id for root sessions). */
    lineageId: string;
    /** Ordered lineage history from root to current. */
    lineage: SessionLineageEntry[];
    /** Current state of the compaction lifecycle machine. */
    compactionState: 'idle' | 'checking_threshold' | 'microcompact' | 'collapse' | 'autocompact' | 'reactive_compact' | 'boundary_commit' | 'done' | 'failed';
    /** Epoch ms of the last compaction run. */
    lastCompactedAt?: number | undefined;
    /** Number of messages at last compaction checkpoint. */
    compactionMessageCount?: number | undefined;
}
/**
 * Returns the default initial state for the session domain.
 */
export declare function createInitialSessionState(): SessionDomainState;
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