performance snippets

perf-snippet.js

let toggle = false
const attachHandler = () =>
  document
    .getElementById("message-composer-input")
    .addEventListener("change", function() {



      if(!toggle) {
        performance.mark('start')
      } else {
        performance.mark('end')
        performance.measure(
          "test",
          "start",
          "end"
        );
        var measures = performance.getEntriesByName("start");
        var measure = measures[0];
        console.log("setTimeout milliseconds:", measure.duration)
        performance.clearMarks();
        performance.clearMeasures();
      }
      toggle = !toggle
    });