*TS Template added by @mjbvz* **TypeScript Version**: 3.9.0-dev.20200427 **Search Terms** - Vue - constructor - javascript --- <!-- ⚠️⚠️ Do Not Delete This! bug_report_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Also please test using the latest insiders build to make sure your issue has not already been fixed: https://code.visualstudio.com/insiders/ --> <!-- Use Help > Report Issue to prefill these. --> - VSCode Version: 1.44.2 - OS Version: Win10 <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes Intellisense broken after added property. Steps to Reproduce: In a _test_ directory : ```bash yarn init -y yarn add vue ``` Create a javascript file _index.js_ : ```javascript import Vue from 'vue'; Vue.config.productionTip = true; const vm = new Vue(""); ``` Intellisense work :  Intellisense broken :  ____ ### A second test with another module (dayjs) Intellisense work :  Intellisense broken :  ____ ### A third test with a function constructor in index.js It always works, _test_ property exists. 