/**
 * Small in-memory cache with TTL + in-flight de-duplication.
 * Intended for provider-layer request fanout control.
 */
/** Cache used by providers to reuse recent responses and collapse concurrent calls. */
export declare class ProviderCache {
    private readonly now;
    private readonly entries;
    private readonly inflight;
    constructor(now?: () => number);
    /**
     * Returns cached value when fresh; otherwise executes loader once for all callers.
     * `ttlMs <= 0` disables persistence but still preserves in-flight de-duplication.
     */
    getOrLoad<T>(key: string, ttlMs: number, loader: () => Promise<T>): Promise<T>;
    /** Drops all cached and in-flight entries. */
    clear(): void;
    private readCached;
}
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