JS autocomplete recommends and inserts out-of-context symbols

[abbondanza]

• VSCode Version: 1.43.2
• OS Version: Win 10 Enterprise v1909; build 18363.836

Steps to Reproduce:

1. Create a brand new JS file with the following contents:

const o = {
  f: function() {},
};

2. Attempt to type in ...args within the f function's parentheses.

Notice how .apply (this is just because apply is the first recommendation) is automatically inserted for each dot that is typed. This can also be reproduced in TS files. The odd part is that .apply doesn't even belong in the argument list. Also, I've noticed that this does not happen with free functions, only ones that are defined within an object.

Reproduction GIF:

Does this issue occur when all extensions are disabled?: Yes

[mjbvz]

Does this reproduce in the latest VS Code insiders build with all extensions disabled?

[yume-chan]

@mjbvz I can reproduce this with latest insider build and extensions disabled.

Version: 1.46.0-insider
Commit: 876f2e7
Date: 2020-05-27T05:41:02.088Z
Electron: 7.2.4
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Darwin x64 19.4.0

[mjbvz]

Thanks. Opened microsoft/TypeScript#38840 to track upstream