/**
 * Creates an interval that calls the callback every `ms` milliseconds.
 * In Node.js, the interval is unref'd to prevent it from keeping the process alive.
 * @param fn - The callback to invoke
 * @param ms - The interval in milliseconds
 * @returns A cleanup function to clear the interval
 */
export declare function createInterval(fn: () => void, ms: number): () => void;
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