export type AppendCondition = {
    namespace: string;
} & ({
    key: string;
    sha256: string;
    latestPrefix?: string;
} | {
    absent: true;
    latestPrefix: string;
} | {
    keysSha256: string;
    count: number;
});
export declare class AppendConditionFailed extends Error {
}
export declare function validateAppendConditions(input: unknown): AppendCondition[];
interface NativeReader {
    prepare(sql: string): {
        all(...parameters: string[]): Array<{
            key: string;
            content: string;
            status: string | null;
        }>;
    };
}
export declare function assertAppendConditions(db: NativeReader, conditions: AppendCondition[]): void;
export {};
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