fix: update benchmark and plugins

Author: jp-knj

benchmark/bench/mdx-compilers.js

@@ -1,4 +1,4 @@
-import { performance } from 'perf_hooks';
+import { performance } from 'node:perf_hooks';
 import { VFile } from 'vfile';
 import { createMdxProcessor } from '../../packages/integrations/mdx/dist/plugins.js';
 

packages/integrations/mdx/src/plugins.ts

@@ -23,7 +23,7 @@ import { rehypeOptimizeStatic } from './rehype-optimize-static.js';
 // Skip nonessential plugins during performance benchmark runs
 const isPerformanceBenchmark = Boolean(process.env.ASTRO_PERFORMANCE_BENCHMARK);
 
-export interface MdxProcessorExtraOptions {
+interface MdxProcessorExtraOptions {
 	sourcemap: boolean;
 	experimentalHeadingIdCompat: boolean;
 	config?: AstroConfig;