/**
 * Centralised copy-to-clipboard with a single, module-scope auto-clear
 * timer.
 *
 * Why module scope: tying the timer to a React component (via `useRef`)
 * means it gets cancelled when the screen unmounts — which happens
 * routinely (auto-lock on tab-switch, navigation to another item). The
 * user's just-completed copy then either gets wiped immediately
 * (component cleanup runs `setStringAsync("")`) or sits indefinitely.
 *
 * Behaviour:
 *   * `copyToClipboard(value)` writes the value, returns `true` on
 *     success.
 *   * On success, schedules a 30-second auto-wipe.
 *   * Subsequent copies cancel the prior timer and reschedule, so the
 *     wipe is always 30 seconds from the *last* copy regardless of
 *     which screen issued it.
 *
 * Limitation: we don't read the clipboard back (would require the
 * clipboard-read permission), so if the user copies from another app
 * between our copy and the auto-clear firing, we'll still wipe their
 * value at the 30s mark. Acceptable trade-off for a password manager.
 */
/** Write `value` to the clipboard. Returns `true` if the write succeeded. */
export declare function copyToClipboard(value: string): Promise<boolean>;
/**
 * Wipe the clipboard now (e.g. on explicit logout). Cancels the pending
 * auto-clear so we don't fire a redundant wipe later.
 */
export declare function clearClipboardNow(): Promise<void>;
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