fix: process.exit in writeBundle hook

Author: davidpett

src/index.ts

@@ -68,9 +68,11 @@ export const unpluginFactory: UnpluginFactory<Options | undefined> = (options =
       compiler = await createCompiler(validated.config)
       buildQueue = new BuildQueue(compiler)
     },
-    async buildEnd() {
-      // ensure the process exits when the build is finished
-      process.exit(0)
+    async writeBundle() {
+      // Clean up compiler resources after files are written
+      await compiler?.destroy()
+      compiler = undefined
+      buildQueue = undefined
     },
     /**
      * `transformInclude` is called for every file that is being transformed.