js-sys 0.2.7

Bindings for all JS global objects and functions in all JS environments like Node.js and browsers, built on `#[wasm_bindgen]` using the `wasm-bindgen` crate. 
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use wasm_bindgen_test::*;
use wasm_bindgen::JsCast;
use js_sys::*;

#[wasm_bindgen_test]
fn promise_inheritance() {
    let promise = Promise::new(&mut |_, _| ());
    assert!(promise.is_instance_of::<Promise>());
    assert!(promise.is_instance_of::<Object>());
    let _: &Object = promise.as_ref();
}