Incorrect resolution of default import for library.type = "system" #19922
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AlekseyMalakhov
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Hello, sorry for small delay, investigating, sounds like a bug |
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Open an issue - #19950, it should work, because for other external types we generate |
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Currently I’m migrating my project from Webpack 4 to Webpack 5. Project uses SystemJS modules.
In Webpack 4 when you bundle a library (e. g. React) as SystemJS module, default import of resulting module will return a whole object (React in my case).
In Webpack 5 when you bundle a library (e. g. React) as SystemJS module, default import of resulting module will return undefined, instead of the whole object.
I created a small, reproducible example. Here is a link
Repo contains 2 folders - webpack4 and webpack5 with (almost) identical code. The goal is to show the difference in behavior between Webpack 4 and 5.
How to start:
npm installin both folders (webpack4 and webpack5)npm run servein both foldersconsole.logsfromsrc/app.jsfile.You will see the following difference:
http://localhost:9004 - displays data for both default and named import (React and useEffect).
http://localhost:9005 - displays data only for named import (useEffect). React is undefined.
If we check the resulted
main.jsfiles created by both webpacks we will see the that Webpack 5 has the following expression:But the problem is that
edoes not have adefaultproperty. That’s why React is undefined.Webpack 4 does not have this string and works correctly - for default import it returns the whole React module.
Any suggestions how to fix it in Webpack 5?
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