Build.PowerShell.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netstandard2.1</TargetFramework>
    <AssemblyName>Build.PowerShell</AssemblyName>
    <OutDir>artifacts</OutDir>
  </PropertyGroup>
 
  <ItemGroup>
    <!-- Copies the psd1 file and flattens the directory with TargetPath-->
    <None Include="$(ProjectDir)\src\**\*.psd1" TargetPath="%(Filename)%(Extension)" CopyToOutputDirectory="PreserveNewest"/>

    <!-- Finds all ps1 files for merging -->
    <MyPowerShellFiles Include="src\**\*.ps1"/>
  </ItemGroup>

  <Target Name="CombineFiles" AfterTargets="CopyFilesToOutputDirectory">
    <!-- loops through all the ps1 files and reads them in the ItemsFromFile variable -->
    <ReadLinesFromFile File="%(MyPowerShellFiles.Identity)">
      <Output TaskParameter="Lines" ItemName="ItemsFromFile"/>
    </ReadLinesFromFile>

    <!-- Resets the psm1 file and injects the needed using statement to consume our sdk project -->
    <WriteLinesToFile File="$(OutDir)\$(AssemblyName).psm1" Lines="using module '.\$(AssemblyName).dll'" Overwrite="true" Encoding="Unicode"/>

    <!-- writes all of the functions into a single psm1 file -->
    <WriteLinesToFile File="$(OutDir)\$(AssemblyName).psm1" Lines="@(ItemsFromFile)" Overwrite="false" Encoding="Unicode"/>
  </Target>
</Project>