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> Anything wrong with that?

It only works in browser environments.

Node has EventEmitter: https://nodejs.org/en/learn/asynchronous-work/the-nodejs-eve...

See, for instance, https://www.electronjs.org/docs/latest/api/ipc-renderer

Browser environments don't have EventEmitter. Different event APIs between browsers & nodejs. A library (3rd party or custom) is needed to make event code isomorphic.

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