Buggyfill for sp-textfield not firing `change` event

fix-change-event.js

(function () {
  if(require("uxp").versions.uxp.startsWith("uxp-5.5.1")) {
    let curField, curValue;
    document.addEventListener("focus", evt => {
      curField = evt.target;
      curValue = curField.value;
    }, true);
    document.addEventListener("blur", evt => {
      if (evt.target.tagName === "SP-TEXTFIELD") {
        if (curField === evt.target) {
          if (curValue !== evt.target.value) {
            const changeEvent = new Event("change", {
              bubbles: true
            });
            evt.target.dispatchEvent(changeEvent);
          }
        }
      }
    }, true);
  }
})();