/**
 * Parses a human-readable duration string into milliseconds.
 * Supports various units: ms, s, m, h, d, w.
 *
 * @param input - The duration string to parse (e.g., "5s", "10 min", "2h 30m").
 * @returns The duration in milliseconds.
 *
 * @throws {Error} If input is empty.
 * @throws {Error} If input format is invalid.
 * @throws {Error} If the numeric value is negative or NaN.
 * @throws {Error} If the unit is not recognized.
 *
 * @example
 * // Basic usage
 * parseDuration("5s"); // Returns 5000
 *
 * @example
 * // Minutes
 * parseDuration("10m"); // Returns 600000
 *
 * @example
 * // Hours
 * parseDuration("2h"); // Returns 7200000
 *
 * @example
 * // Combined units
 * parseDuration("1h 30m 15s"); // Returns 5415000
 *
 * @example
 * // With spaces
 * parseDuration("5 seconds"); // Returns 5000
 *
 * @note Supports abbreviated units (ms, s, m, h, d, w) and full names (milliseconds, seconds, minutes, hours, days, weeks).
 * Units are case-insensitive. Multiple units can be combined with spaces.
 *
 * @complexity Time: O(n), Space: O(1) - Where n is the length of input string
 */
export declare function parseDuration(input: string): number;
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