How declare pub struct with pub fields with wasm_bindgen attribute

libs
1 
#[wasm_bindgen]
pub struct Foo{
   pub bar: String,
}

got error:

the trait bound String: std::marker::Copy is not satisfied the trait std::marker::Copy is not implemented for String

2

For cross-referencing: you also posted this as a bug here: How declare pub struct with pub fields with wasm_bindgen attribute · Issue #3417 · rustwasm/wasm-bindgen · GitHub

The error message tells you that it expects the fields to implement Copy. String does not (and cannot) implement Copy, so you cannot use that as a public field. You should be able to implement a getter (docs) to return your string though.