Experimental support for decorators error when tsconfig.json isn't in project root.

[jessehallam]

• [ x] I have searched through existing issues
• [ x] I have read through docs
• [ x] I have read FAQ

Info

• Platform: Windows 10
• Vetur version: 0.12.5
• VS Code version: 1.24.1

Problem

Experimental TS decorators yield a false negative on the tsconfig "experimentalDecorators": true value when VS Code is opened to a folder farther up the tree from the location where tsconfig.json resides.

In other words:

• The project lives at C:\Projects\FooProject, and VS Code is opened there.
• The tsconfig.json file is, in fact, at C:\Projects\FooProject\FrontEnd\tsconfig.json.

Result:

The @ symbol next to a decorator in SFCs has a red line under it. It shows the following error:

Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.

Opening VS Code to the exact director with the tsconfig.json file fixes the issue.

Reproducible Case

See this repo for a minimal reproducible sample.

This image shows that VS Code believe there is an error in App.vue.

And this image shows that VS Code believes the error lies in the decorator.

[iam3yal]

Related #815.

[jessehallam]

Closing this issue and using the message chain of #815.