fix: analysing build chunk without dependencies (#15469)

Co-authored-by: patak <[email protected]>

Author: morethanwords

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

@@ -5,7 +5,7 @@ import type {
   ImportSpecifier,
 } from 'es-module-lexer'
 import { init, parse as parseImports } from 'es-module-lexer'
-import type { OutputChunk, SourceMap } from 'rollup'
+import type { SourceMap } from 'rollup'
 import type { RawSourceMap } from '@ampproject/remapping'
 import convertSourceMap from 'convert-source-map'
 import {
@@ -377,15 +377,17 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
                   if (filename === ownerFilename) return
                   if (analyzed.has(filename)) return
                   analyzed.add(filename)
-                  const chunk = bundle[filename] as OutputChunk | undefined
+                  const chunk = bundle[filename]
                   if (chunk) {
                     deps.add(chunk.fileName)
-                    chunk.imports.forEach(addDeps)
-                    // Ensure that the css imported by current chunk is loaded after the dependencies.
-                    // So the style of current chunk won't be overwritten unexpectedly.
-                    chunk.viteMetadata!.importedCss.forEach((file) => {
-                      deps.add(file)
-                    })
+                    if (chunk.type === 'chunk') {
+                      chunk.imports.forEach(addDeps)
+                      // Ensure that the css imported by current chunk is loaded after the dependencies.
+                      // So the style of current chunk won't be overwritten unexpectedly.
+                      chunk.viteMetadata!.importedCss.forEach((file) => {
+                        deps.add(file)
+                      })
+                    }
                   } else {
                     const removedPureCssFiles =
                       removedPureCssFilesCache.get(config)!