ApolloLink export is undefined since 3.5

[DanielFGray]

Intended outcome:

I'm building a custom link using

import { ApolloLink } from '@apollo/client'
class MyLink extends ApolloLink {}

Actual outcome:

in v3.4.17 it works fine, but in 3.5 it is undefined

TypeError: Class extends value undefined is not a constructor or null

the types are fine, but console.log(ApolloLink) prints undefined

How to reproduce the issue:

Downgrade to 3.4.x and it works fine
upgrade to 3.5 and it is undefined

[benjamn]

@DanielFGray What bundler are you using? Can you provide a small reproduction?

[hwillson]

We haven't heard back regarding our question in #9143 (comment) so we'll close this off.

[CarsonF]

I just hit this as well. 4 days too late apparently haha. I'm still on webpack 4.46... Continuing to dig.

Edit: Ok figured out my problem. FileLoader wasn't configured to exclude .cjs files, so webpack thought it was a raw file instead of js code to resolve/load.
@DanielFGray maybe this is your problem too.

[inakineitor]

@CarsonF Hi! How did you configure FileLoader? I followed your suggestion by adding cjs to source extensions instead of asset extensions but it is not working for me.

[CarsonF]

You'll have to consult expo/metro docs. I'm not even sure that uses Webpack.
Maybe facebook/metro#535 will help?

[inakineitor]

Thank you!