Allow pdb delta to be optionally included in a hot reload payload (#39540) (#39742)

* Allow pdb delta to be optionally included in a hot reload payload

Fixes #39036

Author: pranavkm

src/Components/Web.JS/src/Boot.WebAssembly.ts

@@ -42,8 +42,8 @@ async function boot(options?: Partial<WebAssemblyStartOptions>): Promise<void> {
     }
   });
 
-  Blazor._internal.applyHotReload = (id: string, metadataDelta: string, ilDeta: string) => {
-    DotNet.invokeMethod('Microsoft.AspNetCore.Components.WebAssembly', 'ApplyHotReloadDelta', id, metadataDelta, ilDeta);
+  Blazor._internal.applyHotReload = (id: string, metadataDelta: string, ilDelta: string, pdbDelta: string | undefined) => {
+    DotNet.invokeMethod('Microsoft.AspNetCore.Components.WebAssembly', 'ApplyHotReloadDelta', id, metadataDelta, ilDelta, pdbDelta);
   };
 
   Blazor._internal.getApplyUpdateCapabilities = () => DotNet.invokeMethod('Microsoft.AspNetCore.Components.WebAssembly', 'GetApplyUpdateCapabilities');

src/Components/Web.JS/src/GlobalExports.ts

@@ -60,7 +60,7 @@ interface IBlazor {
     attachWebRendererInterop?: typeof attachWebRendererInterop,
 
     // APIs invoked by hot reload
-    applyHotReload?: (id: string, metadataDelta: string, ilDelta: string) => void,
+    applyHotReload?: (id: string, metadataDelta: string, ilDelta: string, pdbDelta: string | undefined) => void,
     getApplyUpdateCapabilities?: () => string,
   }
 }

src/Components/WebAssembly/WebAssembly/src/HotReload/HotReloadAgent.cs

@@ -188,7 +188,7 @@ public void ApplyDeltas(IReadOnlyList<UpdateDelta> deltas)
                 {
                     if (TryGetModuleId(assembly) is Guid moduleId && moduleId == item.ModuleId)
                     {
-                        MetadataUpdater.ApplyUpdate(assembly, item.MetadataDelta, item.ILDelta, ReadOnlySpan<byte>.Empty);
+                        MetadataUpdater.ApplyUpdate(assembly, item.MetadataDelta, item.ILDelta, item.PdbBytes ?? ReadOnlySpan<byte>.Empty);
                     }
                 }
 

src/Components/WebAssembly/WebAssembly/src/HotReload/UpdateDelta.cs

@@ -11,6 +11,8 @@ internal sealed class UpdateDelta
 
         public byte[] ILDelta { get; set; } = default!;
 
+        public byte[]? PdbBytes { get; set; }
+
         public int[]? UpdatedTypes { get; set; }
     }
 }

src/Components/WebAssembly/WebAssembly/src/HotReload/WebAssemblyHotReload.cs

@@ -42,13 +42,14 @@ internal static async Task InitializeAsync()
         /// For framework use only.
         /// </summary>
         [JSInvokable(nameof(ApplyHotReloadDelta))]
-        public static void ApplyHotReloadDelta(string moduleIdString, byte[] metadataDelta, byte[] ilDeta)
+        public static void ApplyHotReloadDelta(string moduleIdString, byte[] metadataDelta, byte[] ilDelta, byte[] pdbBytes)
         {
             var moduleId = Guid.Parse(moduleIdString);
 
             _updateDeltas[0].ModuleId = moduleId;
             _updateDeltas[0].MetadataDelta = metadataDelta;
-            _updateDeltas[0].ILDelta = ilDeta;
+            _updateDeltas[0].ILDelta = ilDelta;
+            _updateDeltas[0].PdbBytes = pdbBytes;
 
             _hotReloadAgent!.ApplyDeltas(_updateDeltas);
         }

src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt

@@ -1 +1,3 @@
 #nullable enable
+*REMOVED*static Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.ApplyHotReloadDelta(string! moduleIdString, byte[]! metadataDelta, byte[]! ilDeta) -> void
+static Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.ApplyHotReloadDelta(string! moduleIdString, byte[]! metadataDelta, byte[]! ilDelta, byte[]! pdbBytes) -> void