"Solution Style" tsconfig causes VS Code Typescript language service to break

[seangwright]

TypeScript Version:

"typescript": "3.9.7"

Search Terms:

"Solution Style" tsconfig
VS Code Typescript import intellisense failure

Code

https://github.com/seangwright/ng10-0-3-typescript-issue

Expected behavior:

Using "Solution Style" tsconfig.json in VS Code keeps standard code fixes for imports.

Actual behavior:

Code fixes for imports are completely broken.

The below repository was created with a new Angular 10.0.3 project without any Typescript customizations or VS Code settings.

Playground Link:

https://github.com/seangwright/ng10-0-3-typescript-issue

Steps:

• npm i -g @angular/cli@latest
• ng new ng103 --skip-git
• cd ng103
• code .
  • Open in VS Code (1.47.2)
• Open src/app/app.module.ts
• Remove line 5: import { AppComponent } from './app.component';
• Try to use ctrl + . code action / fix to add the import statement for AppComponent
  • this fails and instead recommends Add 'const' to unresolved variable

• Navigate to src/app/app.component
• Try to use ctrl + . code action / fix to add the import statement for TestService
  • this fails and instead shows No code actions available

Now checkout branch fix/standard-tsconfig and try the above two steps to reproduce the issue and you will see the issue is gone.

All that is different between master and fix/standard-tsconfig is that master uses a "Solution Style" tsconfig.json and fix/standard-tsconfig uses the normal tsconfig.json.

Related Issues:

Both of these were closed but I'm experiencing the exact same issue:
#39411
microsoft/vscode#101696

This one is open but doesn't include the same visual details/simple reproduction:
#39632

I've tried reproducing this with VS Code 1.47.2 and Angular 10 and Typescript 10.8.3 (which means I'm not using "Solution Style" tsconfig.json and I _cannot reproduce the issue.

This problem seems to be specific to "Solution Style" tsconfig.json.

[alan-agius4]

Duplicate of #39632 and #39370

[seangwright]

Closing as a duplicate.