import { DurationUnit } from '@doist/todoist-sdk';
type ParsedDuration = {
    amount: number;
    unit: DurationUnit;
};
export declare const DURATION_INPUT_DESCRIPTION = "The duration of the task. Use format: \"2h\" (hours), \"90m\" (minutes), \"2h30m\" (combined), \"1.5h\" (decimal hours), or \"3d\" (whole days; days cannot be combined with hours or minutes). Todoist apps only display durations under 24 hours: a longer or day-based duration is stored and reported by this server, but the apps show the task as having no duration.";
export declare class DurationParseError extends Error {
    constructor(input: string, reason: string);
}
/**
 * Parses a duration string in the restricted syntax into the amount and unit
 * the API stores: whole days for "3d", otherwise minutes.
 *
 * @param durationStr - Duration string like "2h30m", "45m", "1.5h", "3d"
 * @returns Parsed duration amount and unit
 * @throws DurationParseError for invalid formats
 */
export declare function parseDuration(durationStr: string): ParsedDuration;
/**
 * Formats a stored duration back to a human-readable string.
 * Used when returning task data to LLMs.
 *
 * The output mirrors the stored unit so it round-trips through `parseDuration`:
 * day durations become "3d", and minute durations always use hours/minutes
 * ("48h", never "2d") so a day-based and a minute-based duration stay
 * distinguishable.
 *
 * @param amount - Duration amount in the given unit
 * @param unit - The unit the amount is stored in
 * @returns Formatted duration string like "2h30m", "45m" or "3d"
 */
export declare function formatDuration(amount: number, unit?: DurationUnit): string;
export {};
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