fix npm build (#701)

ErsatzTV/ErsatzTV.csproj

@@ -12,6 +12,43 @@
         <IncludeAllContentForSelfExtract>true</IncludeAllContentForSelfExtract>
     </PropertyGroup>
 
+    <Target Name="PublishRunWebpack" AfterTargets="ComputeFilesToPublish">
+        <!-- Build Target: Run webpack dist build -->
+        <Message Importance="high" Text="Running npm build..." />
+        <Exec WorkingDirectory="$(SpaRoot)" Command="npm run build" />
+
+        <!-- Include the newly-built files in the publish output -->
+        <ItemGroup>
+            <DistFiles Include="wwwroot\v2\**" />
+            <ResolvedFileToPublish Include="@(DistFiles->'%(FullPath)')" Exclude="@(ResolvedFileToPublish)">
+                <RelativePath>%(DistFiles.Identity)</RelativePath>
+                <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
+            </ResolvedFileToPublish>
+        </ItemGroup>
+    </Target>
+
+    <Target Name="DebugEnsureNodeEnv" BeforeTargets="Build">
+        <!-- Build Target:  Ensure Node.js is installed -->
+        <Exec Command="node --version" ContinueOnError="true">
+            <Output TaskParameter="ExitCode" PropertyName="ErrorCode" />
+        </Exec>
+        <Error Condition="'$(ErrorCode)' != '0'" Text="Node.js is required to build and run this project. To continue, please install Node.js from https://nodejs.org/, and then restart your command prompt or IDE." />
+    </Target>
+
+    <Target Name="DebugEnsureNpm" AfterTargets="DebugEnsureNodeEnv">
+        <!-- Build Target:  Ensure Node.js is installed -->
+        <Exec Command="npm --version" ContinueOnError="true">
+            <Output TaskParameter="ExitCode" PropertyName="ErrorCode" />
+        </Exec>
+    </Target>
+
+    <Target Name="EnsureNodeModulesInstalled" BeforeTargets="Build" Inputs="package.json" Outputs="packages-lock.json">
+        <!-- Build Target: Restore NPM packages using npm -->
+        <Message Importance="high" Text="Restoring dependencies using 'npm'. This may take several minutes..." />
+
+        <Exec WorkingDirectory="$(SpaRoot)" Command="npm ci" />
+    </Target>
+
     <ItemGroup>
       <Folder Include="Resources" />
     </ItemGroup>