/**
 * Minimal structural view of the `redis` v4 client used by the migration steps.
 * A client from `createClient()` satisfies it; tests can pass lightweight fakes.
 */
/**
 * SCAN reply: `redis` v4 returns the object form; the raw `[cursor, keys]` form is
 * accepted for clients that pass the RESP reply through unchanged.
 */
export type MigrationScanReply = {
    cursor: number;
    keys: string[];
} | [cursor: string, keys: string[]];
export interface MigrationRedisClient {
    sendCommand(args: string[]): Promise<unknown>;
    dbSize(): Promise<number>;
    scan(cursor: number, options: {
        MATCH?: string;
        COUNT?: number;
    }): Promise<MigrationScanReply>;
    type(key: string): Promise<string>;
    pTTL(key: string): Promise<number>;
    get(key: string): Promise<string | null>;
    hGetAll(key: string): Promise<Record<string, string>>;
    sMembers(key: string): Promise<string[]>;
    lRange(key: string, start: number, stop: number): Promise<string[]>;
    zRangeWithScores(key: string, start: number, stop: number): Promise<Array<{
        value: string;
        score: number;
    }>>;
}