/**
 * Zero-delay macrotask dispatcher.
 *
 * Bypasses the browser's minimum 4ms clamp penalty (HTML timer throttling) for nested `setTimeout`
 * by utilizing a private `MessageChannel` connection. Falls back to `setTimeout(callback, 0)`
 * if `MessageChannel` is unavailable or if fake timers are active in a testing context.
 *
 * Utilizes a FIFO queue with a moving head pointer to avoid array shifting overhead,
 * maintaining high performance and order of execution.
 *
 * @param callback - The function to execute in the next event loop tick.
 *
 * @example
 * ```ts
 * queueMacrotask(() => {
 *   console.log('Executed in the next macrotask');
 * });
 * ```
 */
export declare const queueMacrotask: (callback: VoidFunction) => void;
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