Cannot use JS strings without copying them into wasm memory · Issue #287 · rustwasm/wasm-bindgen (original) (raw)

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Description

This doesn't work, but it should:

#[wasm_bindgen] extern { #[wasm_bindgen(js_name = String)] pub extern type JsString;

pub fn slice(this: &JsString, start: u32, end: u32) -> JsString;

}

This is blocking all the String related bindings in #275.

I haven't dug in very far, but I think the issue is that strings are special cased by wasm-bindgen to always copy in/out of wasm memory, and so we can't reference them as an opaque extern type.