/**
 * The clock behind the voice status line's rotating phrase, as plain functions.
 *
 * ★★ Why this is not simply a hook. fe-libs tests run with no DOM and no React
 * renderer, and static rendering runs no effects. A clock written inline in a
 * component is exercised by nothing, so every way of breaking it — never
 * starting, never resetting, never clearing — passes the whole suite (measured:
 * seven such mutations survived before this split). Here the state rules are
 * pure and the ticker runs under fake timers; the hook that joins them is a few
 * lines, pinned by `voiceStatusWiring.test.ts`.
 */
export interface RotationClock {
    /** Whole rotation steps since the clock last became active. */
    readonly steps: number;
    readonly active: boolean;
}
export declare const IDLE_ROTATION_CLOCK: RotationClock;
/**
 * Follow `active`, restarting from step 0 whenever it changes.
 *
 * ★ Returns the SAME object when nothing changed. The hook adjusts state during
 * render only on a change of identity, so a fresh object here every call would
 * be an infinite render loop.
 */
export declare function syncRotationClock(clock: RotationClock, active: boolean): RotationClock;
/** One tick. A tick that lands after the clock went inactive is ignored. */
export declare function advanceRotationClock(clock: RotationClock): RotationClock;
export declare function rotationElapsedMs(clock: RotationClock): number;
/** Call `onTick` every `intervalMs` until the returned stop function runs. */
export declare function startRotationTicker(onTick: () => void, intervalMs?: number): () => void;
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