From 66cd1640d16170e0c2d9eb4565ad1ebe81f940e1 Mon Sep 17 00:00:00 2001
From: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>
Date: Sat, 24 Sep 2022 19:57:56 +0530
Subject: [PATCH] fix(build): remove leading underscore from chunks (#1394)

---
 src/node/build/bundle.ts | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/node/build/bundle.ts b/src/node/build/bundle.ts
index 1ec51b37..1d3fb566 100644
--- a/src/node/build/bundle.ts
+++ b/src/node/build/bundle.ts
@@ -68,6 +68,7 @@ export async function bundle(
         // other
         preserveEntrySignatures: 'allow-extension',
         output: {
+          sanitizeFileName,
           ...rollupOptions?.output,
           ...(ssr
             ? {
@@ -197,3 +198,19 @@ 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(/^_+/, '')
+  )
+}