Detect prototype overrides.js

var funcSerialized = (name) => `function ${name}() { [native code] }`;
var nativeObjects = [Array, Boolean, Date, Function, JSON, Object, Promise, RegExp];
var ignoreList = ['length', 'constructor', '__proto__', 'caller', 'callee', 'arguments', 'source', 'toGMTString'];
var test = (nativeObject) => {
  const proto = nativeObject.prototype || nativeObject;
  Object.getOwnPropertyNames(proto)
    .filter(name => !ignoreList.includes(name))
    .filter(name => proto[name])
    .map(name => ({
      name,
      func: proto[name],
      funcToString: proto[name].toString(),
    })).forEach(({ name, func, funcToString}) => {
      if (funcToString !== funcSerialized(name)) {
        console.log('Function', name, 'overloaded by client script:', func);
      }
    });
};
nativeObjects.forEach(obj => test(obj));