fix(ssr): remove pure CSS dynamic import (#17371)

Author: sapphi-red

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

@@ -318,7 +318,64 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
 },
 
 generateBundle({ format },bundle){
-if(format!=='es'||ssr||isWorker){
+if(format!=='es'){
+return
+}
+
+if(ssr||isWorker){
+constremovedPureCssFiles=removedPureCssFilesCache.get(config)
+if(removedPureCssFiles&&removedPureCssFiles.size>0){
+for(constfileinbundle){
+constchunk=bundle[file]
+if(chunk.type==='chunk'&&chunk.code.includes('import')){
+constcode=chunk.code
+letimports!: ImportSpecifier[]
+try{
+imports=parseImports(code)[0].filter((i)=>i.d>-1)
+}catch(e: any){
+constloc=numberToPos(code,e.idx)
+this.error({
+name: e.name,
+message: e.message,
+stack: e.stack,
+cause: e.cause,
+pos: e.idx,
+loc: { ...loc,file: chunk.fileName},
+frame: generateCodeFrame(code,loc),
+})
+}
+
+for(constimpofimports){
+const{
+n: name,
+s: start,
+e: end,
+ss: expStart,
+se: expEnd,
+}=imp
+leturl=name
+if(!url){
+constrawUrl=code.slice(start,end)
+if(rawUrl[0]===`"`&&rawUrl[rawUrl.length-1]===`"`)
+url=rawUrl.slice(1,-1)
+}
+if(!url)continue
+
+constnormalizedFile=path.posix.join(
+path.posix.dirname(chunk.fileName),
+url,
+)
+if(removedPureCssFiles.has(normalizedFile)){
+// remove with Promise.resolve({}) while preserving source map location
+chunk.code=
+chunk.code.slice(0,expStart)+
+`Promise.resolve({${''.padEnd(expEnd-expStart-19,' ')}})`+
+chunk.code.slice(expEnd)
+}
+}
+}
+}
+}
 return
 }