From 432515a118c86b8dc177c2b3d94386daf945aefc Mon Sep 17 00:00:00 2001
From: shir0u <85612853+shir0u@users.noreply.github.com>
Date: Tue, 2 Nov 2021 03:59:37 +1100
Subject: [PATCH] fix: allow css to be written for systemjs output

---
 packages/vite/src/node/plugins/css.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/vite/src/node/plugins/css.ts b/packages/vite/src/node/plugins/css.ts
index 5a1430e4c04954..947104c1ddde3d 100644
--- a/packages/vite/src/node/plugins/css.ts
+++ b/packages/vite/src/node/plugins/css.ts
@@ -391,7 +391,11 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
           // this is a shared CSS-only chunk that is empty.
           pureCssChunks.add(chunk.fileName)
         }
-        if (opts.format === 'es' || opts.format === 'cjs') {
+        if (
+          opts.format === 'es' ||
+          opts.format === 'cjs' ||
+          opts.format === 'system'
+        ) {
           chunkCSS = await processChunkCSS(chunkCSS, {
             inlined: false,
             minify: true
@@ -450,7 +454,7 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
           .join('|')
           .replace(/\./g, '\\.')
         const emptyChunkRE = new RegExp(
-          opts.format === 'es'
+          opts.format === 'es' || opts.format === 'system'
             ? `\\bimport\\s*"[^"]*(?:${emptyChunkFiles})";\n?`
             : `\\brequire\\(\\s*"[^"]*(?:${emptyChunkFiles})"\\);\n?`,
           'g'