revert: "fix(build): remove leading underscore from chunks" (#1471)

This reverts commit 66cd1640d1.

src/node/build/bundle.ts

@@ -68,7 +68,6 @@ export async function bundle(
         // other
         preserveEntrySignatures: 'allow-extension',
         output: {
-          sanitizeFileName,
           ...rollupOptions?.output,
           ...(ssr
             ? {
@@ -198,19 +197,3 @@ function staticImportedByEntry(
   cache.set(id, someImporterIs)
   return someImporterIs
 }
-
-// https://github.com/rollup/rollup/blob/69ff4181e701a0fe0026d0ba147f31bc86beffa8/src/utils/sanitizeFileName.ts
-
-const INVALID_CHAR_REGEX = /[\x00-\x1F\x7F<>*#"{}|^[\]`;?:&=+$,]/g
-const DRIVE_LETTER_REGEX = /^[a-z]:/i
-
-function sanitizeFileName(name: string) {
-  const driveLetter = DRIVE_LETTER_REGEX.exec(name)?.[0] || ''
-  return (
-    driveLetter +
-    name
-      .substring(driveLetter.length)
-      .replace(INVALID_CHAR_REGEX, '_')
-      .replace(/^_+/, '')
-  )
-}