perf: replace startsWith with === (#13989)

Author: btea

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

@@ -122,9 +122,10 @@ export function assetImportMetaUrlPlugin(config: ResolvedConfig): Plugin {
               preferRelative: true,
             })
             file = await assetResolver(url, id)
-            file ??= url.startsWith('/')
-              ? slash(path.join(config.publicDir, url))
-              : slash(path.resolve(path.dirname(id), url))
+            file ??=
+              url[0] === '/'
+                ? slash(path.join(config.publicDir, url))
+                : slash(path.resolve(path.dirname(id), url))
           }
 
           // Get final asset URL. If the file does not exist,

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

@@ -619,7 +619,7 @@ export async function toAbsoluteGlob(
   if (glob.startsWith('../')) return pre + posix.join(dir, glob)
   if (glob.startsWith('**')) return pre + glob
 
-  const isSubImportsPattern = glob.startsWith('#') && glob.includes('*')
+  const isSubImportsPattern = glob[0] === '#' && glob.includes('*')
 
   const resolved = normalizePath(
     (await resolveId(glob, importer, {