JS Sampling Profiler

profiler.js

const profiler = await performance.profile({
  categories: ["js"],
  sampleInterval: 10
});
const trace = await profiler.stop();
// Example trace looks something like this
{
  "frames": [
    {
      "column": 4,
      "line": 2,
      "name": "schedule",
      "resourceId": 0
    },
    {
      "column": 9,
      "line": 1,
      "name": "makeLongTask",
      "resourceId": 0
    }
  ],
  "resources": [
    "http://localhost:8080/index.html"
  ],
  "samples": [
    {
      "stackId": 1,
      "timestamp": 31.48999996483326
    }
  ],
  "stacks": [
    {
      "frameId": 1
    },
    {
      "frameId": 1,
      "parentId": 0
    }
  ]
}