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Showing content from https://github.com/rustwasm/wasm-bindgen/issues/3213 below:

Cannot inherit from structs created via `#[wasm_bindgen]` attribute as expected · Issue #3213 · wasm-bindgen/wasm-bindgen · GitHub

If I create a struct in rust and export the struct via #[wasm_bindgen] attribute, and if I then inherit this struct from javascript space, my Javascript derived class will only be recognized as the parent class. For example, if I override any methods of the parent class, only the parent class methods are called. Also, obj instanceof DerivedClass == false and obj instance ParentClass == true, where i would expect both instanceof conditions to be true.

1. Create a struct A in rust and export the struct via #[wasm_bindgen]

2. In javasript, create a class B that inherits the Rust struct A

3. Create an instance of your derived javascript class. let obj = new B()

4. test expect(obj instanceof B).toBe(true)

Step 4 should pass

Step 4 will fail (obj is not an instance of B)

Why this matters is because when I override any methods of the Base class, the override methods are not being called, but instead only the base methods are being called.

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