JavaScript synchronous native communication to WKWebView

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No I don’t believe it is possible due to the multi-process architecture of WKWebView. WKWebView runs in the same process as your application but it communicates with WebKit which runs in its own process (Introducing the Modern WebKit API). The JavaScript code will be running in the WebKit process. So essentially you are asking to have synchronous communication between two different processes which goes against their design.

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