继上一篇《React Native WebView onMessage 收不到 window.postMessage 消息》之后，我遇到一个奇怪的 WebView 问题：

Setting onMessage on a WebView overrides existing values of window.postMessage, but a previous value was defined.

这次就机智了，第一时间找 React Native 官网的 issues，果然就有了：onMessage failing when there are JS warnings and errors on the page

由于里面给的方案是这样的：

(function() {
  var originalPostMessage = window.postMessage;

  var patchedPostMessage = function(message, targetOrigin, transfer) { 
    originalPostMessage(message, targetOrigin, transfer);
  };

  patchedPostMessage.toString = function() { 
    return String(Object.hasOwnProperty).replace('hasOwnProperty', 'postMessage'); 
  };

  window.postMessage = patchedPostMessage;
})();

实际上，就是在上一篇中，我们复写了 window.postMessage 方法导致的。不过，由于上面的代码及作者给出的，都不能满足 AirBnb ESLint 的风格，因此便记录一下修改后的代码

const patchPostMessageFunction = () => {
  const originalPostMessage = window.postMessage;

  const patchedPostMessage = (message, targetOrigin, transfer) => {
    originalPostMessage(message, targetOrigin, transfer);
  };

  patchedPostMessage.toString = () => String(Object.hasOwnProperty).replace('hasOwnProperty', 'postMessage');

  window.postMessage = patchedPostMessage;
};

const patchPostMessageJsCode = `(${String(patchPostMessageFunction)})();`;