<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">My test code is as follows. When I run the code, I got the error “<b style="font-family: Menlo; font-size: 11px;" class="">Can't find private variable: @derivedConstructor</b>”. V8 is ok with the test code.<br class=""><div class=""><br class=""></div><div class=""><div class="">function doSomething(callback) {</div><div class=""> callback();</div><div class="">}</div><div class=""><br class=""></div><div class="">class Test {</div><div class=""> testFunc() {</div><div class=""> doSomething(async () => {</div><div class=""> console.log("testFunc");</div><div class=""> await sleep(2);</div><div class=""> console.log("testFunc end");</div><div class=""> });</div><div class=""> }</div><div class="">}</div><div class=""><br class=""></div><div class="">let test = new Test();</div><div class="">test.testFunc();</div></div></body></html>