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kotlinlang

Is the `NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE` compiler error for the `wasmJs` target planned to be relaxed at some point?

We are considering this, but it is not on our short-term roadmap. Relaxing this rule for external interfaces seems more approachable than for external classes.
We always welcome people talking about specific use cases, they help us set priorities.

<@U3K6VQZLJ> has a real use case it seems. It was mentioned in <#C0B8L3U69|javascript> wanting to create mocks of certain JS APIs, but that can't be done for WASM as you can't extend, for start.