Function defineDeprecationWarning

docs/external/js/react.development.js:591–599

(methodName, info)

    };

    var defineDeprecationWarning = function (methodName, info) {
      Object.defineProperty(Component.prototype, methodName, {
        get: function () {
          warn('%s(...) is deprecated in plain JavaScript React classes. %s', info[0], info[1]);

          return undefined;
        }
      });
    };

    for (var fnName in deprecatedAPIs) {
      if (deprecatedAPIs.hasOwnProperty(fnName)) {