rust wasm_error ai_generated true

error: the trait bound `JsValue: From<MyType>` is not satisfied

ID: rust/rust-wasm-bindgen-error

Also available as: JSON · Markdown
82%Fix Rate
84%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1 active — — —

Root Cause

wasm-bindgen cannot automatically convert Rust types to JS. Types exposed to JS must implement or derive the necessary wasm-bindgen traits.

generic

Workarounds

  1. 88% success Use #[wasm_bindgen] attribute on structs and impl blocks 
    use wasm_bindgen::prelude::*;
#[wasm_bindgen]
pub struct MyType { ... }
#[wasm_bindgen]
impl MyType { ... }

    Sources: https://rustwasm.github.io/docs/wasm-bindgen/reference/types.html

  2. 85% success Serialize to JSON via serde-wasm-bindgen for complex types 
    use serde_wasm_bindgen;
let js_value = serde_wasm_bindgen::to_value(&my_struct)?;

    Sources: https://docs.rs/serde-wasm-bindgen/latest/serde_wasm_bindgen/

Dead Ends

Common approaches that don't work:

  1. Use transmute to force type conversion between Rust and JS 95% fail

    Memory layouts differ between Rust and WASM; transmute causes undefined behavior

Error Chain

Leads to:
Preceded by:
Frequently confused with: