feat: WasmExport for raw exports

Author: GerardSmit

AspNetCore.sln

@@ -251,37 +251,22 @@
     </Target>
 
     <!--
-        Generate WasmExports.g.cs automatically.
-        This file contains the [UnmanagedCallersOnly] exports that must be in the main assembly.
-        Generated at build time so users don't have to write it manually.
+        Source generator for WasmExports.g.cs.
+        The generator scans referenced assemblies for [WasmExport] methods
+        and generates forwarding exports with [UnmanagedCallersOnly] in the main assembly.
+        This provides better incremental compilation support than MSBuild targets.
     -->
-    <PropertyGroup>
-        <WasmExportsGeneratedDir>$(BaseIntermediateOutputPath)generated\</WasmExportsGeneratedDir>
-        <WasmExportsGeneratedFile>$(WasmExportsGeneratedDir)WasmExports.g.cs</WasmExportsGeneratedFile>
-        <WasmExportsNamespace Condition="'$(WasmExportsNamespace)' == ''">$(RootNamespace)</WasmExportsNamespace>
-        <WasmExportsNamespace Condition="'$(WasmExportsNamespace)' == ''">$(AssemblyName)</WasmExportsNamespace>
-    </PropertyGroup>
-
-    <Target Name="GenerateWasmExports" 
-            BeforeTargets="CoreCompile"
-            Inputs="$(MSBuildThisFileDirectory)WasmExports.cs.template"
-            Outputs="$(WasmExportsGeneratedFile)">
-        <MakeDir Directories="$(WasmExportsGeneratedDir)" />
-        
-        <PropertyGroup>
-            <_WasmExportsTemplate>$([System.IO.File]::ReadAllText('$(MSBuildThisFileDirectory)WasmExports.cs.template'))</_WasmExportsTemplate>
-            <_WasmExportsContent>$(_WasmExportsTemplate.Replace('$NAMESPACE$', '$(WasmExportsNamespace)'))</_WasmExportsContent>
-        </PropertyGroup>
-
-        <WriteLinesToFile File="$(WasmExportsGeneratedFile)"
-                          Lines="$(_WasmExportsContent)"
-                          Overwrite="true"
-                          WriteOnlyWhenDifferent="true" />
-    </Target>
-
-    <!-- Include the generated file in compilation -->
-    <ItemGroup>
-        <Compile Include="$(WasmExportsGeneratedFile)" Visible="false" />
+    
+    <!-- For local development (ZaptoWasmUseProjectReference=true), reference the generator project -->
+    <ItemGroup Condition="'$(ZaptoWasmUseProjectReference)' == 'true'">
+        <ProjectReference Include="$(MSBuildThisFileDirectory)..\..\..\src\Zapto.AspNetCore.Wasm.SourceGenerator\Zapto.AspNetCore.Wasm.SourceGenerator.csproj"
+                          OutputItemType="Analyzer"
+                          ReferenceOutputAssembly="false" />
+    </ItemGroup>
+    
+    <!-- For NuGet package consumption, include the analyzer from package path -->
+    <ItemGroup Condition="'$(ZaptoWasmUseProjectReference)' != 'true'">
+        <Analyzer Include="$(MSBuildThisFileDirectory)..\analyzers\dotnet\cs\Zapto.AspNetCore.Wasm.SourceGenerator.dll" />
     </ItemGroup>
 
 </Project>

sdk/Zapto.AspNetCore.CloudFlare.SDK/Sdk/Sdk.targets

@@ -21,9 +21,23 @@
         <None Include="Sdk\Sdk.props" Pack="true" PackagePath="Sdk" />
         <None Include="Sdk\index.js" Pack="true" PackagePath="Sdk" />
         <None Include="Sdk\wrangler.toml" Pack="true" PackagePath="Sdk" />
-        <None Include="Sdk\WasmExports.cs.template" Pack="true" PackagePath="Sdk" />
+        <!-- Source generator replaces WasmExports.cs.template for better incremental compilation -->
         <!-- Sdk.targets is added dynamically with version substitution -->
     </ItemGroup>
+    
+    <!-- Include the source generator in the package -->
+    <ItemGroup>
+        <ProjectReference Include="..\..\src\Zapto.AspNetCore.Wasm.SourceGenerator\Zapto.AspNetCore.Wasm.SourceGenerator.csproj" 
+                          PrivateAssets="all" 
+                          ReferenceOutputAssembly="false" />
+    </ItemGroup>
+    
+    <Target Name="IncludeSourceGenerator" BeforeTargets="GenerateNuspec">
+        <ItemGroup>
+            <_PackageFiles Include="..\..\src\Zapto.AspNetCore.Wasm.SourceGenerator\bin\$(Configuration)\netstandard2.0\Zapto.AspNetCore.Wasm.SourceGenerator.dll" 
+                           PackagePath="analyzers/dotnet/cs" />
+        </ItemGroup>
+    </Target>
 
     <!-- 
         Generate Sdk.targets with the package version embedded.

sdk/Zapto.AspNetCore.CloudFlare.SDK/Sdk/WasmExports.cs.template

@@ -0,0 +1,7 @@
+// ReSharper disable once CheckNamespace
+namespace System.Runtime.CompilerServices;
+
+/// <summary>
+/// Polyfill for init-only properties in netstandard2.0.
+/// </summary>
+internal static class IsExternalInit;