y u no Wasm, WKWebView?.swift

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate {
    var webView: WKWebView!
    
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let myURL = URL(string:"https://webassembly.org")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
        
        webView.evaluateJavaScript("""
            if(typeof WebAssembly !== 'undefined') {
                console.log("no Wasm for you!");
            }
        """) { _, error in
                    //
        }
        
        webView.evaluateJavaScript("typeof WebAssembly !== 'undefined' ? 'Yes' : 'No'") { (result, error) in
            if error != nil {
                print(result)
            }
        }
    }
}