Dongbo Wang (@daxian-dbw) I think I'm a little late with the PR, but it could still be useful for a while.

Ilya (@iSazonov) We still need to have TypeCatalogGen in our build. With the type catalog, you can use a .NET type without caring whether the assembly that contains it is already loaded because powershell is able to look it up in the type catalog and load the assembly automatically. So it would be a breaking change if we remove the type catalog. And TypeCatalogGen will be useful for new features too, for example, the extension methods support Staffan Gustafsson (@powercode) is working on -- we will need to do some analysis of all reference assemblies at build time to build a cache of all .NET extension methods, which will improve the runtime performance. So this PR is not late 😄
BTW, I'm busy on other tasks recently and thus is slow on code review, sorry for that.

Travis Plunk (@TravisEz13) Dongbo Wang (@daxian-dbw) Could you please continue the code review?

Dongbo Wang (@daxian-dbw) Are you ok with this change now?

Travis Plunk (@TravisEz13) I haven't got the time to carefully review this yet. Will do it soon.

Dongbo Wang (@daxian-dbw) Could you please review?

Will the TypeCatalogGen target execute when we running dotnet restore or dotnet build on Microsoft.PowerShell.SDK.csproj?

We call dotnet msbuild .\Microsoft.PowerShell.SDK.csproj /t:"Clean;TypeCatalogGen" "/property:DesignTimeBuild=true" in Build.psm1 in the same point as before - so the behavior must be the same.

Ah, sorry - your question of a direct call - it needs to be checked explicitly because dependencies is deeply.

Update: I preserve current logic - currently we call Start-PSBuild -TypeGen (and dotnet msbuild .\Microsoft.PowerShell.SDK.csproj /t:_GetDependencies "/property:DesignTimeBuild=true;_DependencyFile=$ps_inc_file" /nologo) to update the type catalog and also the type catalog file CorePsTypeCatalog.cs will be generated if it absent (or changed, or we have updates in type references.).

Great. My concern was that the type catalog (both .inc and .cs) would be generated when just running Start-PSBuild for a build. I will continue the review.
(BTW, I took Monday off, so please don't be concerned if I didn't reply promptly.)

Dongbo Wang (@daxian-dbw) Do you want to review?

This PR has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed if no further activity occurs within 10 days.
Thank you for your contributions.
Community members are welcome to grab these works.

This PR has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed if no further activity occurs within 10 days.
Thank you for your contributions.
Community members are welcome to grab these works.

Should I fix or close the PR?

/cc Dongbo Wang (@daxian-dbw)

Sorry that I completely lost the context here. I won't have much time for code review recently. I'm fine we close this PR for now and we can revive it when needed.