Timespan to Milliseconds

ts2ms.js

const timespanToMs=(timeSpan)=>{
    let lut={'':1, ms:1, s:1000, m:60000, h:3600000, d: 86400000, w:604800000, y:31556952000 }
    let ms=(`${timeSpan}`.match(/\d+[ywdhms]{0,2}\s?/g)).reduce((a,s)=>{
      let [,v,m] =s.match(/(\d+)([ywdhms]{0,2})/)
      return a + (v * lut[m])
    },0)
    return ms
  }

  let passTests=[
    timespanToMs('22s') === 22000,
    timespanToMs('22d') === 1900800000,
    timespanToMs(' 1y 4d 22s') === 31902574000
  ].filter(test=>test===false).length===0

  console.log(passTests ? 'Passed all tests':'Something croaked')