diff --git a/packages/plugin-rsc/examples/basic/vite.config.ts b/packages/plugin-rsc/examples/basic/vite.config.ts
index 98edceac7..258a0e3ef 100644
--- a/packages/plugin-rsc/examples/basic/vite.config.ts
+++ b/packages/plugin-rsc/examples/basic/vite.config.ts
@@ -20,7 +20,6 @@ export default defineConfig({
       },
       // disable auto css injection to manually test `loadCss` feature.
       rscCssTransform: false,
-      ignoredPackageWarnings: [/@vitejs\/test-dep-/],
       copyServerAssetsToClient: (fileName) =>
         fileName !== '__server_secret.txt',
     }),
diff --git a/packages/plugin-rsc/src/plugin.ts b/packages/plugin-rsc/src/plugin.ts
index 47ac1ce58..54365be47 100644
--- a/packages/plugin-rsc/src/plugin.ts
+++ b/packages/plugin-rsc/src/plugin.ts
@@ -39,6 +39,7 @@ import {
 } from './vite-utils'
 import { cjsModuleRunnerPlugin } from './plugins/cjs'
 import { evalValue, parseIdQuery } from './plugins/utils'
+import { createDebug } from '@hiogawa/utils'
 
 // state for build orchestration
 let serverReferences: Record<string, string> = {}
@@ -98,6 +99,7 @@ export type RscPluginOptions = {
 
   rscCssTransform?: false | { filter?: (id: string) => boolean }
 
+  /** @deprecated use "DEBUG=vite-env:*" to see warnings. */
   ignoredPackageWarnings?: (string | RegExp)[]
 
   /**
@@ -939,7 +941,7 @@ function hashString(v: string) {
 function vitePluginUseClient(
   useClientPluginOptions: Pick<
     RscPluginOptions,
-    'ignoredPackageWarnings' | 'keepUseCientProxy' | 'environment'
+    'keepUseCientProxy' | 'environment'
   >,
 ): Plugin[] {
   const packageSources = new Map<string, string>()
@@ -969,6 +971,8 @@ function vitePluginUseClient(
     }
   }
 
+  const debug = createDebug('vite-rsc:use-client')
+
   return [
     {
       name: 'rsc:use-client',
@@ -992,18 +996,9 @@ function vitePluginUseClient(
           // expectation on dependency optimizer on browser. Directly copying over
           // "?v=<hash>" from client optimizer in client reference can make a hashed
           // module stale, so we use another virtual module wrapper to delay such process.
-          // TODO: suggest `optimizeDeps.exclude` and skip warning if that's already the case.
-          const ignored = useClientPluginOptions.ignoredPackageWarnings?.some(
-            (pattern) =>
-              pattern instanceof RegExp
-                ? pattern.test(id)
-                : id.includes(`/node_modules/${pattern}/`),
+          debug(
+            `internal client reference created through a package imported in '${this.environment.name}' environment: ${id}`,
           )
-          if (!ignored) {
-            this.warn(
-              `[vite-rsc] detected an internal client boundary created by a package imported on rsc environment`,
-            )
-          }
           id = cleanUrl(id)
           warnInoncistentClientOptimization(this, id)
           importId = `/@id/__x00__virtual:vite-rsc/client-in-server-package-proxy/${encodeURIComponent(id)}`
@@ -1232,13 +1227,15 @@ function vitePluginDefineEncryptionKey(
 function vitePluginUseServer(
   useServerPluginOptions: Pick<
     RscPluginOptions,
-    'ignoredPackageWarnings' | 'enableActionEncryption' | 'environment'
+    'enableActionEncryption' | 'environment'
   >,
 ): Plugin[] {
   const serverEnvironmentName = useServerPluginOptions.environment?.rsc ?? 'rsc'
   const browserEnvironmentName =
     useServerPluginOptions.environment?.browser ?? 'client'
 
+  const debug = createDebug('vite-rsc:use-server')
+
   return [
     {
       name: 'rsc:use-server',
@@ -1253,20 +1250,12 @@ function vitePluginUseServer(
               this.environment.mode === 'dev' &&
               id.includes('/node_modules/')
             ) {
-              const ignored =
-                useServerPluginOptions.ignoredPackageWarnings?.some(
-                  (pattern) =>
-                    pattern instanceof RegExp
-                      ? pattern.test(id)
-                      : id.includes(`/node_modules/${pattern}/`),
-                )
-              if (!ignored) {
-                this.warn(
-                  `[vite-rsc] detected an internal server function created by a package imported on ${this.environment.name} environment`,
-                )
-              }
-              // module runner has additional resolution step and it's not strict about
+              // similar situation as `use client` (see `virtual:client-in-server-package-proxy`)
+              // but module runner has additional resolution step and it's not strict about
               // module identity of `import(id)` like browser, so we simply strip queries such as `?v=`.
+              debug(
+                `internal server reference created through a package imported in ${this.environment.name} environment: ${id}`,
+              )
               id = cleanUrl(id)
             }
             if (config.command === 'build') {