@gitlab/ui/dist/vendor/bootstrap-vue/src/utils/warn.js

GitLab UI Components

import { IS_BROWSER, HAS_MUTATION_OBSERVER_SUPPORT } from '../constants/env';
import { getNoWarn } from './env';

/**
 * Log a warning message to the console with BootstrapVue formatting
 * @param {string} message
 */
const warn = function (message) /* istanbul ignore next */{
  let source = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
  if (!getNoWarn()) {
    console.warn(`[BootstrapVue warn]: ${source ? `${source} - ` : ''}${message}`);
  }
};

/**
 * Warn when no Promise support is given
 * @param {string} source
 * @returns {boolean} warned
 */
const warnNotClient = source => {
  /* istanbul ignore else */
  if (IS_BROWSER) {
    return false;
  } else {
    warn(`${source}: Can not be called during SSR.`);
    return true;
  }
};

/**
 * Warn when no MutationObserver support is given
 * @param {string} source
 * @returns {boolean} warned
 */
const warnNoMutationObserverSupport = source => {
  /* istanbul ignore else */
  if (HAS_MUTATION_OBSERVER_SUPPORT) {
    return false;
  } else {
    warn(`${source}: Requires MutationObserver support.`);
    return true;
  }
};

export { warn, warnNoMutationObserverSupport, warnNotClient };