/**
 * Parse a time string into epoch milliseconds.
 *
 * Supported formats:
 * - Relative durations: "5m", "1h", "2d", "30s"
 * - ISO 8601: "2026-03-02T14:30:00Z"
 * - Epoch milliseconds: "1709391000000"
 * - "now"
 */
export declare function parseTimeString(input: string): number;
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