addWatchFile dose not work when using rspack bundler with virtual module id returned by resolveId

[tangye1234]

Environment

node: 24
rspack core: 1.5.8
unplugin: 2.3.10

Reproduction

Plugin can work in vitejs, but not rspack.

When I setup my own unplugin in rspack dev mode, where the file is resolved as a virtual module, and re-resolved to the real path in load hook, and add it to the watch file. Then I modify the original source, the resolve id and load won't be called any longer.

In my rspack, we have normal css rules, and a plugin which will process a special css file, I don't wont it to be processed by the other css rules, it is a plugin who try to resolve it to another virtual module(not a css file with a unique extention).

I will provide the minimum reproduction in my spare time.

Describe the bug

The hmr won't work in rspack with virtual module.

Additional context

No response

Logs

[tangye1234]

I can use following pnpm patch to fix this issue:

diff --git a/dist/context-BZKy5Nsn.js b/dist/context-BZKy5Nsn.js
index 3186708e19f07486767d3ab469d3eee926a73b3a..a575dee69d091f83006253d1dc656da0a91b4098 100644
--- a/dist/context-BZKy5Nsn.js
+++ b/dist/context-BZKy5Nsn.js
@@ -24,7 +24,14 @@ function createBuildContext(options, compiler, compilation, loaderContext) {
 	return {
 		parse,
 		addWatchFile(id) {
-			options.addWatchFile(resolve(process.cwd(), id));
+			const resolvedPath = resolve(process.cwd(), id);
+			options.addWatchFile(resolvedPath);
+			// PATCH: Also add to loaderContext for per-module HMR
+			// In Webpack/Rspack, loaderContext provides addDependency() method to register file dependencies
+			// This ensures the module will be invalidated when the file changes
+			if (loaderContext && typeof loaderContext.addDependency === 'function') {
+				loaderContext.addDependency(resolvedPath);
+			}
 		},
 		emitFile(emittedFile) {
 			const outFileName = emittedFile.fileName || emittedFile.name;
diff --git a/dist/context-D_KPTgTH.js b/dist/context-D_KPTgTH.js
index 1c62136fb4ec12ab8556862d4ccc1e055a25ceb7..461f7dbb9e91e78d3dbd1a31101f151a0af2ba2f 100644
--- a/dist/context-D_KPTgTH.js
+++ b/dist/context-D_KPTgTH.js
@@ -15,7 +15,17 @@ function createBuildContext(compiler, compilation, loaderContext) {
 		},
 		addWatchFile(file) {
 			const cwd = process.cwd();
-			compilation.fileDependencies.add(resolve(cwd, file));
+			const resolvedPath = resolve(cwd, file);
+			compilation.fileDependencies.add(resolvedPath);
+
+			// PATCH: Also add to loaderContext for per-module HMR
+			// In Rspack, loaderContext provides addDependency() method to register file dependencies
+			// This ensures the module will be invalidated when the file changes
+			// See: rspack/packages/rspack/src/loader-runner/index.ts:313-316
+			if (loaderContext && typeof loaderContext.addDependency === 'function') {
+				loaderContext.addDependency(resolvedPath);
+				console.log('[unplugin patch] Added dependency via loaderContext.addDependency:', resolvedPath);
+			}
 		},
 		getWatchFiles() {
 			return Array.from(compilation.fileDependencies);