Is it possible to define (rather than import) a class that extends another?

[rossng]

I would like to define a custom error class in my Rust code and be able to consume it from my TypeScript code. Looking at the documentation, I can only see how to do this the opposite way around (example).

I have tried something like this:

use js_sys::{Error, Object};

#[wasm_bindgen(extends = Object, extends = Error)]
pub struct BuildError {
}

#[wasm_bindgen]
impl BuildError {
    #[wasm_bindgen(constructor, extends = Error)]
    pub fn new(message: &str) -> BuildError {
        BuildError {}
    }
}

But it clearly isn't the right approach. Is there any way to achieve what I'm trying to do?