import type { TimeUnit } from '../unit';
/**
 * Parse a duration value into a number expressed in `units`. Accepts:
 *   - finite numbers (returned as-is when in safe range)
 *   - pure numeric strings ('5', '-1.5', '+30') — interpreted as a duration in `units`
 *   - simple suffix form ('5m', '-1.5h', '+30s') — converted to `units`
 *   - compound suffix form ('1h30m', '2d4h30m') — components must be in
 *     descending unit order with no repeats and no whitespace; sign applies
 *     to the whole expression, not per component
 *
 * Returns null for empty / whitespace-only strings, NaN/Infinity, date-like
 * strings (those containing '-', '/', ':', or 'T' — use `timeValueParseDate`
 * for those), unit aliases like '5min', and any result outside the safe
 * integer range.
 *
 * @param value		Duration value to parse.
 * @param units		Target unit; pure numeric strings are read as this unit
 *					and suffix components are converted into this unit.
 *
 * @category Time Parsing
 */
export declare function timeValueParse(value: number | string, units: TimeUnit): number | null;