attempt: externalize resolution with "pre"

packages/astro/src/core/create-vite.ts

@@ -6,6 +6,7 @@ import { builtinModules, createRequire } from 'module';
 import { fileURLToPath } from 'url';
 import vite from './vite.js';
 import astroVitePlugin from '../vite-plugin-astro/index.js';
+import externalVitePlugin from '../vite-plugin-external/index.js';
 import astroPostprocessVitePlugin from '../vite-plugin-astro-postprocess/index.js';
 import configAliasVitePlugin from '../vite-plugin-config-alias/index.js';
 import markdownVitePlugin from '../vite-plugin-markdown/index.js';
@@ -54,6 +55,7 @@ export async function createVite(inlineConfig: ViteConfigWithSSR, { astroConfig,
       exclude: [...ALWAYS_EXTERNAL],
     },
     plugins: [
+      externalVitePlugin({ config: astroConfig }),
       configAliasVitePlugin({ config: astroConfig }),
 			astroVitePlugin({ config: astroConfig, devServer, logging }),
 			markdownVitePlugin({ config: astroConfig, devServer }),

packages/astro/src/vite-plugin-external/index.ts

@@ -0,0 +1,20 @@
+import type vite from '../core/vite';
+import type { AstroConfig } from '../@types/astro';
+
+interface AstroPluginOptions {
+  config: AstroConfig;
+}
+
+/** Transform .astro files for Vite */
+export default function astro({ config }: AstroPluginOptions): vite.Plugin {
+  return {
+    name: '@astrojs/vite-plugin-external',
+    enforce: 'pre',
+    resolveId(source, importer, options) {
+      if (source.includes('.config.')) {
+        console.log({ source, importer, options });
+      }
+      return null;
+    }
+  };
+}