fix: chunks are analysed multiple times (vitejs#2541)

Co-authored-by: Richard Petersen <[email protected]>

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

@@ -218,6 +218,7 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
 
           if (imports.length) {
             const s = new MagicString(code)
+            const analyzed: Set<string> = new Set<string>()
             for (let index = 0; index < imports.length; index++) {
               const { s: start, e: end, d: dynamicIndex } = imports[index]
               // if dynamic import polyfill is used, rewrite the import to
@@ -234,6 +235,8 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
                 // literal import - trace direct imports and add to deps
                 const addDeps = (filename: string) => {
                   if (filename === ownerFilename) return
+                  if (analyzed.has(filename)) return
+                  analyzed.add(filename)
                   const chunk = bundle[filename] as OutputChunk | undefined
                   if (chunk) {
                     deps.add(config.base + chunk.fileName)