Function defineDeprecationWarning

docs/index.js:596–606

(methodName, info)

"production" !== 'development' &&
  (function () {
    function defineDeprecationWarning(methodName, info) {
      Object.defineProperty(Component.prototype, methodName, {
        get: function () {
          console.warn(
            "%s(...) is deprecated in plain JavaScript React classes. %s",
            info[0],
            info[1]
          );
        }
      });
    }
    function getIteratorFn(maybeIterable) {
      if (null === maybeIterable || "object" !== typeof maybeIterable)
        return null;