pissang edited a comment on issue #13695:
URL: 
https://github.com/apache/incubator-echarts/issues/13695#issuecomment-734050249


   Hi jarben.
   
   I think it's a problem about multiple npm version management. I found we can 
dot it after npm 6.9.0
   ```js
   npm install echarts@npm:echarts@4
   npm install echarts5@npm:echarts@5
   ```
   
   Then you can import two versions like your proposal API.
   
   Check 
https://stackoverflow.com/questions/26414587/how-to-install-multiple-versions-of-package-using-npm


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