@instructure/canvas-rce/es/getThemeVars.js

A component wrapping Canvas's usage of Tinymce

/*
 * Copyright (C) 2023 - present Instructure, Inc.
 *
 * This file is part of Canvas.
 *
 * Canvas is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, version 3 of the License.
 *
 * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

import { getRegistry } from '@instructure/theme-registry';
import { merge, cloneDeep } from 'lodash';

// The running theme is the running theme for this page load, and it never
// changes, so there's no point in doing the work more than once.
let memoizedVariables;
function getThemeVars() {
  if (memoizedVariables) return memoizedVariables;

  // @ts-expect-error
  const {
    currentThemeKey,
    overrides,
    themes
  } = getRegistry();
  // Just assume the "canvas" theme if the default key is null. This will
  // never happen in the live app because one way or another a theme gets
  // used, but unit tests don't always do that.
  // Also we have to cloneDeep this because the merge below is about to
  // mutate the whole thing.
  const themeKey = currentThemeKey || 'canvas';
  const variables = cloneDeep(themes[themeKey]);
  merge(variables, overrides);
  memoizedVariables = {
    variables,
    key: themeKey
  };
  return memoizedVariables;
}
export { getThemeVars };