/**
 * Instances of this error are thrown by `getTimeFromFrequency` when
 * provided with unsupported frequency.
 */
export declare class InvalidFrequencyError extends Error {
    constructor(frequency: string);
}
/**
 * Gives a rough estimate for a number of milliseconds in the given frequency.
 *
 * IMPORTANT: this function SHOULD NOT be used to calculate precise dates
 * as it doesn't account for leap years, months of variable length, etc. It works
 * best for broad estimates and comparing frequencies.
 *
 * @param frequency Frequency as positive integer + units (y, m, w, d for years, months, weeks and days respectively). You can use .5m for twice a month. Example: 1m (1 month), 4y (4 years).
 * @throws InvalidFrequencyError when provided with unsupported frequency.
 * @returns Estimated number of milliseconds in the given frequency.
 */
export declare function getTimeFromFrequency(frequency: string): number;