@material-ui/core/styles/themeListener.js

React components that implement Google's Material Design.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.CHANNEL = void 0;

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

var _propTypes = _interopRequireDefault(require("prop-types"));

// Same value used by react-jss
var CHANNEL = '__THEMING__';
exports.CHANNEL = CHANNEL;
var themeListener = {
  contextTypes: (0, _defineProperty2.default)({}, CHANNEL, _propTypes.default.object),
  initial: function initial(context) {
    if (!context[CHANNEL]) {
      return null;
    }

    return context[CHANNEL].getState();
  },
  subscribe: function subscribe(context, cb) {
    if (!context[CHANNEL]) {
      return null;
    }

    return context[CHANNEL].subscribe(cb);
  },
  unsubscribe: function unsubscribe(context, subscriptionId) {
    if (context[CHANNEL]) {
      context[CHANNEL].unsubscribe(subscriptionId);
    }
  }
};
var _default = themeListener;
exports.default = _default;