Attempting to use web_sys::window() fails in webworker

[wellcaffeinated]

🐛 Bug description

Loading a wasm-pack module that tries to use web_sys::window() in a webworker fails because "Window" is not defined (capitalized).

This is due to this line of code in the built module .js file:

// ...
export function __widl_instanceof_Window(idx) { return getObject(idx) instanceof Window ? 1 : 0; }
// ...

I tried changing this line to be something (naive):

export function __widl_instanceof_Window(idx) { var Win = 'Window' in self ? Window : DedicatedWorkerGlobalScope; return getObject(idx) instanceof Win ? 1 : 0; }

And this works.

Recommend you find a different way to check for instance of Window that doesn't rely on the Window class being in the global scope.

🤔 Expected Behavior

Should load correctly.

👟 Steps to reproduce

1. Create a simple rust module that tries to use web_sys::window()
2. build it for webpack
3. Load it in a webworker with worker-loader (i'm using workerize-loader... and waiting on a fix Fix for #67 developit/workerize-loader#68)

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.8.1
rustc version: 1.34.1 (fc50f328b 2019-04-24)

[wellcaffeinated]

ah jeeze sorry. Wrong repo.
Already reported here:
rustwasm/wasm-bindgen#1046