chore: cleanup

Author: hi-ogawa

packages/plugin-rsc/src/plugin.ts

@@ -1172,7 +1172,7 @@ export function vitePluginUseClient(
 
 /** @experimental */
 export function vitePluginDefineEncryptionKey(
-  useServerPluginOptions?: Pick<RscPluginOptions, 'defineEncryptionKey'>,
+  useServerPluginOptions: Pick<RscPluginOptions, 'defineEncryptionKey'>,
 ): Plugin[] {
   let defineEncryptionKey: string
   let emitEncryptionKey = false
@@ -1185,7 +1185,7 @@ export function vitePluginDefineEncryptionKey(
       async configEnvironment(name, _config, env) {
         if (name === 'rsc' && !env.isPreview) {
           defineEncryptionKey =
-            useServerPluginOptions?.defineEncryptionKey ??
+            useServerPluginOptions.defineEncryptionKey ??
             JSON.stringify(toBase64(await generateEncryptionKey()))
         }
       },