/**
 * Pure helpers of the sound service — unit-testable without Web Audio.
 */
/** Random variant key: prefix + 1…count, e.g. pickRandomKey("cardShove", 4). */
export declare const pickRandomKey: (prefix: string, count: number, random?: () => number) => string;
/**
 * Run `task` for every item with at most `limit` in flight; settles all,
 * never rejects (the caller decides what a failure means).
 */
export declare function runLimited<T, R>(items: readonly T[], limit: number, task: (item: T) => Promise<R>): Promise<PromiseSettledResult<R>[]>;
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