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const minute = 60const hour = minute * 60const day = hour * 24const week = day * 7const year = day * 365.25
const REGEX =  /^(\+|\-)? ?(\d+|\d+\.\d+) ?(seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)(?: (ago|from now))?$/i
export default (str: string): number => {  const matched = REGEX.exec(str)
  if (!matched || (matched[4] && matched[1])) {    throw new TypeError('Invalid time period format')  }
  const value = parseFloat(matched[2])  const unit = matched[3].toLowerCase()
  let numericDate: number
  switch (unit) {    case 'sec':    case 'secs':    case 'second':    case 'seconds':    case 's':      numericDate = Math.round(value)      break    case 'minute':    case 'minutes':    case 'min':    case 'mins':    case 'm':      numericDate = Math.round(value * minute)      break    case 'hour':    case 'hours':    case 'hr':    case 'hrs':    case 'h':      numericDate = Math.round(value * hour)      break    case 'day':    case 'days':    case 'd':      numericDate = Math.round(value * day)      break    case 'week':    case 'weeks':    case 'w':      numericDate = Math.round(value * week)      break    // years matched    default:      numericDate = Math.round(value * year)      break  }
  if (matched[1] === '-' || matched[4] === 'ago') {    return -numericDate  }
  return numericDate}