react-utils.js

// Copyright (c) 2016 - 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import React from 'react';

const [major, minor] = React.version.split('.');
const versionHigherThanThirteen = Number(minor) > 13 || Number(major) > 13;

export const isReactDOMSupported = () =>
  versionHigherThanThirteen;

/**
 * Support React 0.13 and greater where refs are React components, not DOM
 * nodes.
 * @param {*} ref React's ref.
 * @returns {Element} DOM element.
 */
export const getDOMNode = ref => {
  if (!isReactDOMSupported()) {
    return ref && ref.getDOMNode();
  }
  return ref;
};

const USED_MESSAGES = {};
const HIDDEN_PROCESSES = {
  test: true,
  production: true
};

/**
 * Warn the user about something
 * @param {String} message - the message to be shown
 * @param {Boolean} onlyShowMessageOnce - whether or not we allow the
 - message to be show multiple times
 */
export function warning(message, onlyShowMessageOnce = false) {
  /* eslint-disable no-undef, no-process-env */
  if (process && HIDDEN_PROCESSES[process.env.NODE_ENV]) {
    return;
  }
  /* eslint-enable no-undef, no-process-env */
  if (!onlyShowMessageOnce || !USED_MESSAGES[message]) {
    /* eslint-disable no-console */
    console.warn(message);
    /* eslint-enable no-console */
    USED_MESSAGES[message] = true;
  }
}

/**
 * Convience wrapper for warning
 * @param {String} message - the message to be shown
 */
export function warnOnce(message) {
  warning(message, true);
}