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https://github.com/fluencelabs/wasm-bindgen
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88618116ac
This commit adds support to attach `#[wasm_bindgen]` on an `async fn` which will change the return value into a `Promise` in JS. This in theory has the exact same semantics as an `async` function in JS where you call it with all the arguments, nothing happens and you get a promise back, and then later the promise actually resolves. This commit also adds a helper trait, `IntoJsResult`, to allow `async` functions with multiple kinds of return values instead of requiring everything to be `Result<JsValue, JsValue>`.
51 lines
2.7 KiB
Plaintext
51 lines
2.7 KiB
Plaintext
error[E0277]: the trait bound `std::result::Result<(), ()>: wasm_bindgen::__rt::IntoJsResult` is not satisfied
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--> $DIR/async-errors.rs:29:1
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29 | #[wasm_bindgen]
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| ^^^^^^^^^^^^^^^ the trait `wasm_bindgen::__rt::IntoJsResult` is not implemented for `std::result::Result<(), ()>`
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= help: the following implementations were found:
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<std::result::Result<(), E> as wasm_bindgen::__rt::IntoJsResult>
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<std::result::Result<T, E> as wasm_bindgen::__rt::IntoJsResult>
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= note: required by `wasm_bindgen::__rt::IntoJsResult::into_js_result`
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error[E0277]: the trait bound `std::result::Result<(), BadType>: wasm_bindgen::__rt::IntoJsResult` is not satisfied
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--> $DIR/async-errors.rs:31:1
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31 | #[wasm_bindgen]
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| ^^^^^^^^^^^^^^^ the trait `wasm_bindgen::__rt::IntoJsResult` is not implemented for `std::result::Result<(), BadType>`
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= help: the following implementations were found:
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<std::result::Result<(), E> as wasm_bindgen::__rt::IntoJsResult>
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<std::result::Result<T, E> as wasm_bindgen::__rt::IntoJsResult>
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= note: required by `wasm_bindgen::__rt::IntoJsResult::into_js_result`
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error[E0277]: the trait bound `wasm_bindgen::JsValue: std::convert::From<BadType>` is not satisfied
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--> $DIR/async-errors.rs:33:1
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33 | #[wasm_bindgen]
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| ^^^^^^^^^^^^^^^ the trait `std::convert::From<BadType>` is not implemented for `wasm_bindgen::JsValue`
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= help: the following implementations were found:
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<wasm_bindgen::JsValue as std::convert::From<&'a T>>
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<wasm_bindgen::JsValue as std::convert::From<&'a std::string::String>>
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<wasm_bindgen::JsValue as std::convert::From<&'a str>>
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<wasm_bindgen::JsValue as std::convert::From<MyType>>
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and 62 others
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= note: required because of the requirements on the impl of `std::convert::Into<wasm_bindgen::JsValue>` for `BadType`
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= note: required because of the requirements on the impl of `wasm_bindgen::__rt::IntoJsResult` for `BadType`
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= note: required by `wasm_bindgen::__rt::IntoJsResult::into_js_result`
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error[E0277]: the trait bound `std::result::Result<BadType, wasm_bindgen::JsValue>: wasm_bindgen::__rt::IntoJsResult` is not satisfied
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--> $DIR/async-errors.rs:35:1
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35 | #[wasm_bindgen]
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| ^^^^^^^^^^^^^^^ the trait `wasm_bindgen::__rt::IntoJsResult` is not implemented for `std::result::Result<BadType, wasm_bindgen::JsValue>`
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= help: the following implementations were found:
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<std::result::Result<(), E> as wasm_bindgen::__rt::IntoJsResult>
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<std::result::Result<T, E> as wasm_bindgen::__rt::IntoJsResult>
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= note: required by `wasm_bindgen::__rt::IntoJsResult::into_js_result`
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For more information about this error, try `rustc --explain E0277`.
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