export type SessionEventType = 'prompt.admitted' | 'prompt.promoted' | 'step.started' | 'step.ended' | 'step.failed' | 'text.delta' | 'reasoning.delta' | 'tool.called' | 'tool.succeeded' | 'tool.failed' | 'compaction.ended';
export interface SessionEvent<T = unknown> {
    readonly id: string;
    readonly aggregateId: string;
    readonly seq: number;
    readonly type: SessionEventType;
    readonly version: number;
    readonly data: T;
    readonly time: number;
}
export declare class SessionEventSequenceError extends Error {
    constructor(aggregateId: string, expected: number, got: number);
}
export interface AppendSessionEventInput<T> {
    readonly type: SessionEventType;
    readonly data: T;
    readonly version?: number;
    readonly time?: number;
}
export declare class SessionEventLog {
    readonly aggregateId: string;
    private readonly events;
    constructor(aggregateId: string);
    append<T>(input: AppendSessionEventInput<T>): SessionEvent<T>;
    all(after?: number): readonly SessionEvent[];
    latestSeq(): number;
    toEvents(): SessionEvent[];
    static fromEvents(aggregateId: string, events: readonly SessionEvent[]): SessionEventLog;
}
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