Typerror when calling super() in constructor

[latenssi]

I was debugging an error in js-libp2p which caused it to be unable to connect to peers in a production build in browser build by webpack using create-react-app framework.

I finally found this error message in the logs when a connection fails:
TypeError: Failed to construct 'AbortController': Please use the 'new' operator, this DOM object constructor cannot be called as a function.

The problem is the super() call in the constructor of TimeoutController here: master/index.js#L10.
If I replace the implementation of TimeoutController with one that uses JS prototypes rather than JS classes I get no errors and the connections happen as intended. Not sure if it actually works anymore like that tho'.

I do not know why this happens only in a production build and not in a development setup (webpack-dev-server) but this does happen consistently and prevents libp2p connections in create-react-app based apps.

[jacobheun]

@latenssi what is your es build target for webpack? I am wondering if the production build is compiling to es5 resulting in a _super.call(this) type of call, which might cause this error. The dev server is likely just using es6 targets.

[latenssi]

Yes you are correct, my create-react-app setup seems to be using ES 5 as target.

Perhaps the easiest way to fix my problem is considering ES 6 as target.