fix(build): decode urls in CSS files (fix #15109)

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

@@ -264,22 +264,23 @@ export function cssPlugin(config: ResolvedConfig): Plugin {
       const ssr = options?.ssr === true
 
       const urlReplacer: CssUrlReplacer = async (url, importer) => {
-        if (checkPublicFile(url, config)) {
+        const decodedUrl = decodeURI(url)
+        if (checkPublicFile(decodedUrl, config)) {
           if (encodePublicUrlsInCSS(config)) {
-            return publicFileToBuiltUrl(url, config)
+            return publicFileToBuiltUrl(decodedUrl, config)
           } else {
-            return joinUrlSegments(config.base, url)
+            return joinUrlSegments(config.base, decodedUrl)
           }
         }
-        const resolved = await resolveUrl(url, importer)
+        const resolved = await resolveUrl(decodedUrl, importer)
         if (resolved) {
           return fileToUrl(resolved, config, this)
         }
         if (config.command === 'build') {
           const isExternal = config.build.rollupOptions.external
             ? resolveUserExternal(
                 config.build.rollupOptions.external,
-                url, // use URL as id since id could not be resolved
+                decodedUrl, // use URL as id since id could not be resolved
                 id,
                 false,
               )
@@ -288,11 +289,11 @@ export function cssPlugin(config: ResolvedConfig): Plugin {
           if (!isExternal) {
             // #9800 If we cannot resolve the css url, leave a warning.
             config.logger.warnOnce(
-              `\n${url} referenced in ${id} didn't resolve at build time, it will remain unchanged to be resolved at runtime`,
+              `\n${decodedUrl} referenced in ${id} didn't resolve at build time, it will remain unchanged to be resolved at runtime`,
             )
           }
         }
-        return url
+        return decodedUrl
       }
 
       const {

playground/assets/__tests__/assets.spec.ts

@@ -23,6 +23,10 @@ const assetMatch = isBuild
   ? /\/foo\/bar\/assets\/asset-[-\w]{8}\.png/
   : '/foo/bar/nested/asset.png'
 
+const encodedAssetMatch = isBuild
+  ? /\/foo\/bar\/assets\/asset_small_-[-\w]{8}\.png/
+  : '/foo/bar/nested/asset[small].png'
+
 const iconMatch = `/foo/bar/icon.png`
 
 const fetchPath = (p: string) => {
@@ -153,6 +157,10 @@ describe('css url() references', () => {
     expect(await getBg('.css-url-relative')).toMatch(assetMatch)
   })
 
+  test('encoded', async () => {
+    expect(await getBg('.css-url-encoded')).toMatch(encodedAssetMatch)
+  })
+
   test('image-set relative', async () => {
     const imageSet = await getBg('.css-image-set-relative')
     imageSet.split(', ').forEach((s) => {

playground/assets/index.html

@@ -40,6 +40,9 @@ <h2>CSS url references</h2>
 <div class="css-url-relative">
   <span style="background: #fff">CSS background (relative)</span>
 </div>
+<div class="css-url-encoded">
+  <span style="background: #fff">CSS background (encoded)</span>
+</div>
 <div class="css-image-set-relative">
   <span style="background: #fff"
     >CSS background with image-set() (relative)</span