Performance timing with window.performance

PerformanceTimer.js

const perf = window.performance

class PerformanceTimer {
  constructor (name) {
    this.name = name
    this.markStart = `${name}-start`
    this.markStop = `${name}-stop`
  }

  start () {
    perf.mark(this.markStart)
    return this
  }

  stop () {
    perf.mark(this.markStop)
    return this
  }

  measure () {
    const { name, markStart, markStop } = this
    perf.measure(name, markStart, markStop)
    return perf.getEntriesByName(name, 'measure')
  }
}

export default PerformanceTimer