/**
 * In-memory TTL cache for the UI hierarchy XML emitted by `uiautomator dump`.
 *
 * The cache is active only when the AdbClient is invoked in "turbo" mode: a
 * stale-but-fresh-enough tree (within `ttlMs`) is returned instantly instead of
 * triggering another ~150-300ms adb shell roundtrip.
 *
 * The cache is invalidated explicitly after any action that mutates the screen
 * (tap, swipe, input, etc.) — see AdbClient#invalidateUiTreeCache.
 */
export declare class UiTreeCache {
    private readonly ttlMs;
    private entry;
    constructor(ttlMs?: number);
    /** Returns the cached XML if it is still fresh, otherwise null. */
    get(): string | null;
    /** Replace the cache with the given XML, stamped to now. */
    set(xml: string): void;
    /** Drop the cached entry. Next get() returns null until set() is called again. */
    invalidate(): void;
}
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