process.hrtime polyfill

hrtime.js

(function() {
  const nowOffset = Date.now();
  const now = () => Date.now() - nowOffset;
  global.process.hrtime = global.process.hrtime || ((previousTimestamp) => {
    const baseNow = Math.floor((Date.now() - now()) * 1e-3)
    const clocktime = now() * 1e-3
    let seconds = Math.floor(clocktime) + baseNow
    let nanoseconds = Math.floor((clocktime % 1) * 1e9)

    if (previousTimestamp) {
      seconds = seconds - previousTimestamp[0]
      nanoseconds = nanoseconds - previousTimestamp[1]
      if (nanoseconds < 0) {
        seconds--
        nanoseconds += 1e9
      }
    }
    return [seconds, nanoseconds]
  })
})()

hrtime.min.js

!function(){const o=Date.now(),t=()=>Date.now()-o;global.process.hrtime=global.process.hrtime||(o=>{const e=Math.floor(.001*(Date.now()-t())),n=.001*t();let a=Math.floor(n)+e,l=Math.floor(n%1*1e9);return o&&(a-=o[0],l-=o[1],l<0&&(a--,l+=1e9)),[a,l]})}()

Based on https://github.com/cabinjs/browser-hrtime/blob/master/src/index.ts

Minified by https://xem.github.io/terser-online/