export interface Operation {
    priority: number;
    exec(tx: Transaction): void;
    abort(): void;
}
export declare class Transaction {
    readonly parent: Transaction | null;
    readonly depth: number;
    running: boolean;
    private has;
    private q;
    private n;
    private cursor;
    constructor(parent: Transaction | null);
    begin(): void;
    queue(op: Operation): void;
    consume(): void;
    abort(): void;
}