/**
 * Normalize events timestamp (ISO String, unix time in seconds or ms) to milliseconds.
 *
 * As a reasonable threshold for whether to count the number in seconds or milliseconds,
 * it takes the value 32_503_680_000 (which equals January 12, 1971 in ms and Jan 01, 3000 in seconds).
 *
 * So it isn't applicable to dates before January 12, 1971.
 * */
export declare const normalizeTimestampToMs: (timestamp: string | number) => number;