The powershell[.exe] executable for PowerShell is built by
powershell-unix and powershell-windows projects,
as they are the top dependencies of the graph, and has emitEntryPoint: true,
meaning a native executable is produced automatically by CLI (no need to own a
separate native host).
This project is a very simple shim that provides a Main function for .NET CLI
to produce an app. It initializes PowerShell's custom AssemblyLoadContext and
then delegates to the same Start function in
Microsoft.PowerShell.ConsoleHost that the original native PowerShell host
executes; thus we share the same entry point and the same PowerShell host, but
use a different native host. This lets us take full advantage of .NET CLI's
native host.
We use this shim so that the ConsoleHost project and the original native host
do not have to be changed. Additionally, until .NET CLI bugs surrounding content
file deployment are solved, this shim allows us to continue with our split
Modules folders work-around to deploy the correct versions.