Bindgen restricts which types can be passed across the boundary. The one folks often run into first is that &[T] only works when T is IntoWasmAbi (including JS-imported types4) — i.e. usually not your Rust-exported structs. This means that you are often forced to construct a Vec. This makes sense since JS is going to take control over the resulting JS array, and can mutate it as it pleases. It also means that when the type comes back in, you are unable to accept it as &[T] or Vec unless the earlier IntoWasmAbi caveat applies.
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