--async-exports option for type generation is not working

[mschuwalow]

The bindgen code has a leftover todo that breaks async export generation for all world interface exports:

jco/crates/js-component-bindgen/src/ts_bindgen.rs

Line 597 in 8309be7

let is_world_export = false; // TODO

E.g. if I generate code for the following wit

package example:node-fetch;

interface simple-request {
  record response {
    /// User-provided name for a request
    url: string,

    /// Response body, converted to JSON
    response-json: string,
  }

  /// This function performs a GET request
  /// to the provided URL without supplying an query parameters or a body
  get-json: func(url: string) -> response;
}

world component {
 export simple-request;
}

Using

jco types wit-generated --async-mode jspi --async-wasi-exports  --async-exports 'example:node-fetch/simple-request#get-json' -o src/generated

The generated export is

/** @module Interface example:node-fetch/simple-request **/
export function getJson(url: string): Response;
export interface Response {
  url: string,
  responseJson: string,
}

instead of the expected async code