Get performance measurements from React Fiber

yarn add --dev react-performance-observer

import { observe } from 'react-performance-observer';

observe(measurements => {
  console.log(measurements);
  // [
  //   {
  //     entryType: "measure",
  //     name: "⚛ App [mount]",
  //     componentName: "App",
  //     phase: "mount",
  //     startTime: 281,
  //     duration: 4,
  //     warning: null
  //   },
  //   ...
  // ]
});

import { parseEntry } from 'react-performance-observer';

let observer = new window.PerformanceObserver(list => {
  list.getEntries().forEach(entry => {
    console.log(parseEntry(entry)); // parsed entry or null
  });
});