"require" is not an autocomplete option for blank js file

<!-- 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/ --> Steps to Reproduce: 1. Open a blank JavaScript file 2. type `var x = r` `require` should be the first value that pops up in the autocomplete options. At the moment you can type out the entire word `require` and it _still_ wont appear in the autocomplete list. This is really annoying for node developers that need to use the `require` function all the time and don't have access to an es6 environment. <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes <details> <summary>Version details</summary> Version: 1.28.0 (user setup) Commit: 431ef9da3cf88a7e164f9d33bf62695e07c6c2a9 Date: 2018-10-05T14:58:53.203Z Electron: 2.0.9 Chrome: 61.0.3163.100 Node.js: 8.9.3 V8: 6.1.534.41 Architecture: x64 Windows 10 </details>