import { GalaChainContext } from "../types";
export declare class UniqueTransactionService {
    private static UT_INDEX_KEY;
    private static getUniqueTransactionKey;
    private static putUniqueTransaction;
    private static ensureUniqueKey;
    static ensureUniqueTransaction(ctx: GalaChainContext, uniqueKey: string): Promise<void>;
    static isUniqueTransactionKey(key: string): boolean;
    static pickUniqueTransactionWrites(writes: Record<string, Uint8Array>): Record<string, Uint8Array>;
    /**
     * Copy UNTX writes from a sandbox onto the parent context so a failed inner
     * operation still consumes its uniqueKey.
     */
    static copyUniqueTransactionWrites(from: GalaChainContext, to: GalaChainContext): void;
}
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