Add support for reading the extern alias

[nkolev92]

Fixes #10947

Add support for reading the aliases flag from the assets file.

Note that this requires a NuGet insertion which has not happened yet.

cc @wli3

I want to port this eventually to a 3.1.x.

[wli3]

Some questions. I think it is good in general. also + @dsplaisted in case you find something.

And the test will not pass until the insertion is in?

[dsplaisted]

👍

[nkolev92]

Now that the NuGet dependency has been merged, do I need to rebase to run the tests with the updated NuGet, or is kicking the build off again sufficient?

[dsplaisted]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[dsplaisted]

I believe that kicking off the build again (which I've done) should be sufficient

[nkolev92]

Failed with a compile error :(

[nkolev92]

Squashed my commits into 1 to retrigger the CI.

I'll rebase if it fails with a compile error again.

[dsplaisted]

@nkolev92 Is this ready to merge? It looks like tests are failing on .NET Framework only. If it's an issue where VS hasn't been updated with some functionality this feature needs, then you can use the RequiresMSBuildVersion Fact and Theory attributes to skip the test on full framework for now.

[nkolev92]

I had to do some printf debugging to get that error message on the CI :)

Let me fix that now @dsplaisted!

Thanks for the pointer.

[nkolev92]

Pushed again.

[dsplaisted]

@nkolev92 If those tests are eventually supposed to work on Full MSBuild, it would be preferrable to use RequiresMSBuildVersionFacts.

[nkolev92]

@dsplaisted Fixed.

[nkolev92]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[nkolev92]

@dsplaisted

Should be good now.
Looking at the tests tab, they only ran for core.