diff --git a/packages/vite/src/node/config.ts b/packages/vite/src/node/config.ts
index f633d1158bfa95..a30d84465e9990 100644
--- a/packages/vite/src/node/config.ts
+++ b/packages/vite/src/node/config.ts
@@ -63,7 +63,7 @@ export function defineConfig(config: UserConfigExport): UserConfigExport {
   return config
 }
 
-export type PluginOption = Plugin | false | null | undefined
+export type PluginOption = Plugin | false | null | undefined | PluginOption[]
 
 export interface UserConfig {
   /**
@@ -109,7 +109,7 @@ export interface UserConfig {
   /**
    * Array of vite plugins to use.
    */
-  plugins?: (PluginOption | PluginOption[])[]
+  plugins?: PluginOption[]
   /**
    * Configure resolver
    */
@@ -199,7 +199,7 @@ export interface UserConfig {
     /**
      * Vite plugins that apply to worker bundle
      */
-    plugins?: (PluginOption | PluginOption[])[]
+    plugins?: PluginOption[]
     /**
      * Rollup options to build worker bundle
      */
@@ -322,7 +322,7 @@ export async function resolveConfig(
   configEnv.mode = mode
 
   // resolve plugins
-  const rawUserPlugins = (config.plugins || []).flat().filter((p) => {
+  const rawUserPlugins = (config.plugins || []).flat(Infinity).filter((p) => {
     if (!p) {
       return false
     } else if (!p.apply) {