Accepted answer

The "click" event is fine. Problem is that, RN core's <WebView> implementation for Android is flawed at polyfilling window.postMessage(). This issue has been well discussed in this github issue.

So it seems the nature of problem, is RN has to polyfill the native window.postMessage for some reason, but the override didn't take place timely, causing window.postMessage calls still made to the native one.

One solution (for Android) proposed in that github issue, is simply stop using the native window.postMessage, and directly use the internal interface, which is the actual polyfill function.

// in place of `window.postMessage(data)`, use:

One heads-up though, this API is not public and might be subject to change in future.

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