Function parseDuration

src/core/duration.ts:13–22

(s: string)

 */

export function parseDuration(s: string): number | null {
  const re = /^(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?$/
  const m = re.exec(s.trim())
  if (!m) return null
  const h = Number(m[1] ?? 0)
  const min = Number(m[2] ?? 0)
  const sec = Number(m[3] ?? 0)
  if (h === 0 && min === 0 && sec === 0) return null
  return (h * 3600 + min * 60 + sec) * 1000
}