fix($webpack): make up for fact that webpack creates chunks with hyphens for index files

Author: faceyspacey

src/flushChunks.js

@@ -195,15 +195,15 @@ const filesFromChunks = (
   checkChunkNames?: boolean
 ): Files => {
   const hasChunk = entry => {
-    const result = !!assetsByChunkName[entry]
+    const result = !!(assetsByChunkName[entry] || assetsByChunkName[entry+'-'])
     if (!result && checkChunkNames) {
       console.warn(`[FLUSH CHUNKS]: Unable to find ${entry} in Webpack chunks. Please check usage of Babel plugin.`)
     }
 
     return result
   }
 
-  const entryToFiles = entry => assetsByChunkName[entry]
+  const entryToFiles = entry => assetsByChunkName[entry] || assetsByChunkName[entry+'-']
 
   return [].concat(...chunkNames.filter(hasChunk).map(entryToFiles))
 }