react-router/es6/deprecateObjectProperties.js

A complete routing library for React

import warning from './routerWarning';

export var canUseMembrane = false;

// No-op by default.
var deprecateObjectProperties = function deprecateObjectProperties(object) {
  return object;
};

if (process.env.NODE_ENV !== 'production') {
  try {
    if (Object.defineProperty({}, 'x', {
      get: function get() {
        return true;
      }
    }).x) {
      canUseMembrane = true;
    }
    /* eslint-disable no-empty */
  } catch (e) {}
  /* eslint-enable no-empty */

  if (canUseMembrane) {
    deprecateObjectProperties = function deprecateObjectProperties(object, message) {
      // Wrap the deprecated object in a membrane to warn on property access.
      var membrane = {};

      var _loop = function _loop(prop) {
        if (!Object.prototype.hasOwnProperty.call(object, prop)) {
          return 'continue';
        }

        if (typeof object[prop] === 'function') {
          // Can't use fat arrow here because of use of arguments below.
          membrane[prop] = function () {
            process.env.NODE_ENV !== 'production' ? warning(false, message) : void 0;
            return object[prop].apply(object, arguments);
          };
          return 'continue';
        }

        // These properties are non-enumerable to prevent React dev tools from
        // seeing them and causing spurious warnings when accessing them. In
        // principle this could be done with a proxy, but support for the
        // ownKeys trap on proxies is not universal, even among browsers that
        // otherwise support proxies.
        Object.defineProperty(membrane, prop, {
          get: function get() {
            process.env.NODE_ENV !== 'production' ? warning(false, message) : void 0;
            return object[prop];
          }
        });
      };

      for (var prop in object) {
        var _ret = _loop(prop);

        if (_ret === 'continue') continue;
      }

      return membrane;
    };
  }
}

export default deprecateObjectProperties;