[rush] Putting `pnpm-store` inside the project folder causes high CPU usage when a Rush project is opened in VS Code

[dtinth]

Summary

I noticed that my CPU usage is unusually high whenever I open a Rush project inside VS Code without doing anything.

Repro steps

1. Create a Rush project.
2. Install ~180 dependencies in it (this is the number of dependencies we have in our project).
3. Open a Rush project in VS Code.

Expected result: CPU usage shouldn’t significantly increase (e.g. consistently above 100%).

Actual result: High CPU usage, CPU temperature rises.

Details

This is caused by VS Code’s file watcher trying to watch files in common/temp/pnpm-store. Unlike node_modules, VS Code does not exclude this path by default, and thus attempts to watch every single file. In our project, this causes 79,000+ files to be watched, resulting in high CPU usage.

By adding this to .vscode/settings.json, the problem is resolved.

{
  "files.watcherExclude": {
    "**/pnpm-store/**": true
  }
}

Maybe rush init should add the above configuration when generating a new project.

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@microsoft/rush globally installed version?	5.63.1
rushVersion from rush.json?	5.63.1
useWorkspaces from rush.json?	false
Operating system?	Mac
Would you consider contributing a PR?	No
Node.js version (node -v)?	v16.15.0

[dmichon-msft]

Ideally all of common/temp should probably be ignored by the vscode watcher