Yew (worker) agents are not webpack friendly when using web-sys

[jstarry]

Problem Yew starts workers by making a fake script, setting its source, and trying to call wasm_bindgen on it, which doesn't work in the scope of webpack.

Potential Solution

#[cfg(feature = "web_sys")]
fn worker_new(name_of_resource: &str, is_module: bool) -> Worker {
    let href = utils::document().location().unwrap().href().unwrap();
    let script_url = format!("{}{}", href, name_of_resource);
    cfg_if! {
        if #[cfg(feature = "webpack")] {
            return Worker::new(&script_url).expect("failed to spawn worker");
        }
    }

Context: https://github.com/yewstack/yew/issues/1046#issuecomment-602800124

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[voidpumpkin]

yew-agent since 0.2 no longer creates workers. It only re-exports methods from gloo. If anyone encounters the issue please create it in gloo repository instead.