Task Manager: provide the ability to reuse custom problem matchers

[josh-stoddard-tanium]

I have several related tasks that share a custom output format. I'd like to be able to define a problem matcher for this format once and reference it in multiple tasks like I can for built-in matchers, eg. "problemMatcher": "$my-matcher".

[vscodebot[bot]]

(Experimental duplicate detection) Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Provide Task Runner viewlet (#28235)
• Selection of problem matcher is not very intuitive when running a task (#29562)

[dbaeumer]

This is only possible using an extension. You can provide an extension that contributes problem matchers which then can be referenced via a string. See https://marketplace.visualstudio.com/items?itemName=eamodio.tsl-problem-matcher as an example.

Keeping the issue open to be able to do the same in tasks.json files.

[psukys]

How are problemmatcher conflicts resolved (i.e. two ProblemMatchers having the same name) at the moment?

[dbaeumer]

The extension that got parsed last wins. In this regard it might not be obvious for the user.

[juliancarrivick]

I would find this especially useful in a monorepo. e.g. an Angular repo with many projects where the same task would be reused across each project except with a different base path.

[junalmeida]

This feature request is open since 2018, will it be addressed anytime soon?

[farrrb]

I also think that this would be a great addition!

[willson556]

A nice solution for this would be to allow specifying problem matchers from a JSON file, ideally matching the GitHub format: https://github.com/actions/toolkit/blob/main/docs/problem-matchers.md