fix(build): preload treeshaking ignore equal (#17480)

Author: bluwy

packages/vite/src/node/plugins/importAnalysisBuild.ts

@@ -42,7 +42,7 @@ const preloadMarkerRE = new RegExp(preloadMarker, 'g')
 const dynamicImportPrefixRE = /import\s*\(/
 
 const dynamicImportTreeshakenRE =
-  /((?:\bconst\s+|\blet\s+|\bvar\s+|,\s*)(\{[^}.]+\})\s*=\s*await\s+import\([^)]+\))|(\(\s*await\s+import\([^)]+\)\s*\)(\??\.[\w$]+))|\bimport\([^)]+\)(\s*\.then\(\s*(?:function\s*)?\(\s*\{([^}.]+)\}\))/g
+  /((?:\bconst\s+|\blet\s+|\bvar\s+|,\s*)(\{[^}.=]+\})\s*=\s*await\s+import\([^)]+\))|(\(\s*await\s+import\([^)]+\)\s*\)(\??\.[\w$]+))|\bimport\([^)]+\)(\s*\.then\(\s*(?:function\s*)?\(\s*\{([^}.=]+)\}\))/g
 
 function toRelativePath(filename: string, importer: string) {
   const relPath = path.posix.relative(path.posix.dirname(importer), filename)