What's the idiomatic way to return a Vec<T> where T is tsify(into_wasm_abi)?

[hillin]

With #111 we can now return a Vec<T> if T is #[wasm_bindgen]:

#[wasm_bindgen]
struct Thing(u32);

#[wasm_bindgen]
pub fn get_numbers() -> Vec<Thing> {
    vec![Thing(1), Thing(2), Thing(3)]
}

But it does not work if T is tsified:

#[derive(serde::Serialize, serde::Deserialize, tsify::Tsify)]
#[tsify(into_wasm_abi)]
struct Thing(u32);

  #[wasm_bindgen]
/*^^^^^^^^^^^^^^^ the trait `JsObject` is not implemented for `Thing`
    = help: the following other types implement trait `JsObject`:
              js_sys::Array
              js_sys::ArrayBuffer
              web_sys::features::gen_AudioBuffer::AudioBuffer
              js_sys::SharedArrayBuffer
              web_sys::features::gen_AudioBufferSourceNode::AudioBufferSourceNode
              js_sys::BigInt
              web_sys::features::gen_AudioContext::AudioContext
              web_sys::features::gen_AudioDestinationNode::AudioDestinationNode
            and 164 others
    = note: required for `Thing` to implement `WasmDescribeVector`
    = note: required for `Box<[Thing]>` to implement `WasmDescribe`
    = note: 1 redundant requirement hidden
    = note: required for `Vec<Thing>` to implement `WasmDescribe`
note: required by a bound in `ReturnWasmAbi`
   --> wasm-bindgen-0.2.88\src\convert\traits.rs:176:26
    |
176 | pub trait ReturnWasmAbi: WasmDescribe {
    |                          ^^^^^^^^^^^^ required by this bound in `ReturnWasmAbi`
    = note: this error originates in the attribute macro `wasm_bindgen` (in Nightly builds, run with -Z macro-backtrace for more info)
*/
pub fn get_numbers() -> Vec<Thing> {
    vec![Thing(1), Thing(2), Thing(3)]
}

[hillin]

For now my best bet is to relay the array with a struct:

#[derive(serde::Serialize, serde::Deserialize, tsify::Tsify)]
#[tsify(into_wasm_abi)]
pub struct ThingCollection(Vec<Thing>);

pub fn get_numbers() -> ThingCollection {
   ThingCollection(vec![Thing(1), Thing(2), Thing(3)])
}

This works very well as tsify generates ThingCollection as a type alias of Thing[]:

export type ThingCollection = Thing[];

But it would be even better if we can remove this indirection.

[eneoli]

You might want to check out the tsify-next crate. It replaces the currently unmaintained tsify crate and recently added support for returning Vectors and passing them as parameters.