material-ui/utils/callOnce.js

React Components that Implement Google's Material Design.

'use strict';

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

var _warning = require('warning');

var _warning2 = _interopRequireDefault(_warning);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var CALLED_ONCE = 'muiPrepared';

function callOnce() {
  if (process.env.NODE_ENV !== 'production') {
    return function (style) {
      if (style[CALLED_ONCE]) {
        process.env.NODE_ENV !== "production" ? (0, _warning2.default)(false, 'Material-UI: You cannot call prepareStyles() on the same style object more than once.') : void 0;
      }
      style[CALLED_ONCE] = true;
      return style;
    };
  }
}