refactor: use named regex constants over inline literals (#22964)

Author: btea

packages/vite/src/node/config.ts

@@ -2521,6 +2521,7 @@ async function bundleConfigFile(
   const importMetaResolveVarName =
     '__vite_injected_original_import_meta_resolve'
   const importMetaResolveRegex = /import\.meta\s*\.\s*resolve/
+  const configFileRegex = /\.[cm]?[jt]s$/
 
   const nativeIncompatibilities: NativeConfigIncompatibility[] = []
 
@@ -2607,7 +2608,7 @@ async function bundleConfigFile(
       {
         name: 'inject-file-scope-variables',
         transform: {
-          filter: { id: /\.[cm]?[jt]s$/ },
+          filter: { id: configFileRegex },
           handler(code, id) {
             let injectValues =
               `const ${dirnameVarName} = ${JSON.stringify(path.dirname(id))};` +

packages/vite/src/node/nativeConfigCompat.ts

@@ -220,7 +220,7 @@ export function createNativeConfigCompatPlugin(
     transform: {
       filter: {
         id: {
-          include: /\.[cm]?[jt]sx?$/,
+          include: jsTsExtRE,
           // exclude rolldown runtime
           exclude: /^\0/,
         },