[browser] Emit symbols in WasmSDK

src/mono/nuget/Microsoft.NET.Sdk.WebAssembly.Pack/build/Microsoft.NET.Sdk.WebAssembly.Browser.targets

@@ -334,6 +334,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       EnableThreads="$(_WasmEnableThreads)"
       EnableDiagnostics="$(_WasmEmitDiagnosticModuleBuild)"
       EmitSourceMap="$(_WasmEmitSourceMapBuild)"
+      EmitSymbolMap="$(WasmEmitSymbolMap)"
       FingerprintAssets="$(_WasmFingerprintAssets)"
       FingerprintDotnetJs="$(_WasmFingerprintDotnetJs)"
     >
@@ -362,6 +363,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       <_WasmFingerprintPatterns Include="DllFiles" Pattern="*.dll" Expression="#[.{fingerprint}]!" />
       <_WasmFingerprintPatterns Include="DatFiles" Pattern="*.dat" Expression="#[.{fingerprint}]!" />
       <_WasmFingerprintPatterns Include="Pdb" Pattern="*.pdb" Expression="#[.{fingerprint}]!" />
+      <_WasmFingerprintPatterns Include="Symbols" Pattern="*.js.symbols" Expression="#[.{fingerprint}]!" />
     </ItemGroup>
 
     <DefineStaticWebAssets
@@ -700,6 +702,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       EnableThreads="$(_WasmEnableThreads)"
       EnableDiagnostics="$(_WasmEmitDiagnosticModulePublish)"
       EmitSourceMap="$(_WasmEmitSourceMapPublish)"
+      EmitSymbolMap="$(WasmEmitSymbolMap)"
       IsWebCilEnabled="$(_WasmEnableWebcil)"
       FingerprintAssets="$(_WasmFingerprintAssets)"
     >

src/mono/wasm/Wasm.Build.Tests/ModuleConfigTests.cs

@@ -122,4 +122,29 @@ public async Task AssetIntegrity()
             "There are assets without integrity hash"
         );
     }
+
+    [Theory]
+    [InlineData(true, false)]
+    [InlineData(true, true)]
+    [InlineData(false, false)]
+    [InlineData(false, true)]
+    public void SymbolMapFileEmitted(bool emitSymbolMap, bool isPublish)
+    {
+        Configuration config = Configuration.Release;
+        string extraProperties = $"<WasmEmitSymbolMap>{emitSymbolMap.ToString().ToLowerInvariant()}</WasmEmitSymbolMap>";
+        ProjectInfo info = CopyTestAsset(config, aot: false, TestAsset.WasmBasicTestApp,
+            $"SymbolMapFile_{emitSymbolMap}_{isPublish}", extraProperties: extraProperties);
+
+        if (isPublish)
+            PublishProject(info, config, new PublishOptions(AssertAppBundle: false));
+        else
+            BuildProject(info, config, new BuildOptions(AssertAppBundle: false));
+
+        string frameworkDir = GetBinFrameworkDir(config, forPublish: isPublish);
+
+        // The file may be fingerprinted (e.g. dotnet.native.<hash>.js.symbols),
+        // so use a glob pattern to find it.
+        bool symbolsFileExists = Directory.EnumerateFiles(frameworkDir, "dotnet.native*.js.symbols").Any();
+        Assert.Equal(emitSymbolMap, symbolsFileExists);
+    }
 }

src/mono/wasm/Wasm.Build.Tests/WasmSdkBasedProjectProvider.cs

@@ -32,7 +32,7 @@ protected override IReadOnlyDictionary<string, bool> GetAllKnownDotnetFilesToFin
             { "dotnet.js", true },
             { "dotnet.js.map", false },
             { "dotnet.native.js", true },
-            { "dotnet.native.js.symbols", false },
+            { "dotnet.native.js.symbols", true },
             { "dotnet.native.wasm", true },
             { "dotnet.native.worker.mjs", true },
             { "dotnet.runtime.js", true },

src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/AssetsComputingHelper.cs

@@ -53,6 +53,7 @@ public static bool ShouldFilterCandidate(
         bool enableThreads,
         bool enableDiagnostics,
         bool emitSourceMap,
+        bool emitSymbolMap,
         out string reason)
     {
         var extension = candidate.GetMetadata("Extension");
@@ -90,7 +91,7 @@ public static bool ShouldFilterCandidate(
             ".js" when assetType == "native" => $"{fileName}{extension} is not used by Blazor",
             ".mjs" when assetType == "native" && !(enableThreads && fileName == "dotnet.native.worker") => $"{fileName}{extension} is not used by Blazor",
             ".pdb" when !copySymbols => "copying symbols is disabled",
-            ".symbols" when fromMonoPackage => "extension .symbols is not required.",
+            ".symbols" when !emitSymbolMap => "emitting wasm symbol map is not enabled",
             _ => null
         };
 

src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/ComputeWasmBuildAssets.cs

@@ -52,6 +52,8 @@ public class ComputeWasmBuildAssets : Task
 
     public bool EmitSourceMap { get; set; }
 
+    public bool EmitSymbolMap { get; set; }
+
     public bool FingerprintAssets { get; set; }
 
     public bool FingerprintDotNetJs { get; set; }
@@ -91,7 +93,7 @@ public override bool Execute()
             for (int i = 0; i < Candidates.Length; i++)
             {
                 var candidate = Candidates[i];
-                if (AssetsComputingHelper.ShouldFilterCandidate(candidate, TimeZoneSupport, InvariantGlobalization, LoadFullICUData, CopySymbols, customIcuCandidateFilename, EnableThreads, EnableDiagnostics, EmitSourceMap, out var reason))
+                if (AssetsComputingHelper.ShouldFilterCandidate(candidate, TimeZoneSupport, InvariantGlobalization, LoadFullICUData, CopySymbols, customIcuCandidateFilename, EnableThreads, EnableDiagnostics, EmitSourceMap, EmitSymbolMap, out var reason))
                 {
                     Log.LogMessage(MessageImportance.Low, "Skipping asset '{0}' because '{1}'", candidate.ItemSpec, reason);
                     filesToRemove.Add(candidate);
@@ -251,6 +253,7 @@ private static void ApplyUniqueMetadataProperties(ITaskItem candidate)
             case ".js" when filename.StartsWith("dotnet"):
             case ".mjs" when filename.StartsWith("dotnet"):
             case ".dat" when filename.StartsWith("icudt"):
+            case ".symbols" when filename.StartsWith("dotnet.native"):
                 candidate.SetMetadata("AssetTraitName", "WasmResource");
                 candidate.SetMetadata("AssetTraitValue", "native");
                 break;

src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/ComputeWasmPublishAssets.cs

@@ -58,6 +58,8 @@ public class ComputeWasmPublishAssets : Task
 
     public bool EmitSourceMap { get; set; }
 
+    public bool EmitSymbolMap { get; set; }
+
     public bool IsWebCilEnabled { get; set; }
 
     public bool FingerprintAssets { get; set; }
@@ -676,7 +678,7 @@ private void GroupResolvedFilesToPublish(
         foreach (var candidate in resolvedFilesToPublish)
         {
 #pragma warning disable CA1864 // Prefer the 'IDictionary.TryAdd(TKey, TValue)' method. Dictionary.TryAdd() not available in .Net framework.
-            if (AssetsComputingHelper.ShouldFilterCandidate(candidate, TimeZoneSupport, InvariantGlobalization, LoadFullICUData, CopySymbols, customIcuCandidateFilename, EnableThreads, EnableDiagnostics, EmitSourceMap, out var reason))
+            if (AssetsComputingHelper.ShouldFilterCandidate(candidate, TimeZoneSupport, InvariantGlobalization, LoadFullICUData, CopySymbols, customIcuCandidateFilename, EnableThreads, EnableDiagnostics, EmitSourceMap, EmitSymbolMap, out var reason))
             {
                 Log.LogMessage(MessageImportance.Low, "Skipping asset '{0}' because '{1}'", candidate.ItemSpec, reason);
                 if (!resolvedFilesToPublishToRemove.ContainsKey(candidate.ItemSpec))