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: / var / canvas / node_modules / @instructure / ui-axe-check / es /
Filename : runAxeCheck.js
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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 - present Instructure, 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 axeCore from 'axe-core';
export default async function runAxe(element, options = {}) {
  let result = true;
  const context = {
    include: [element],
    exclude: options.exclude
  };
  const config = {
    runOnly: {
      type: 'tag',
      values: ['wcag2a', 'wcag2aa', 'section508', 'best-practice']
    }
  };
  try {
    const axeResult = await axeCore.run(context, config);

    // violations to ignore/filter out
    const ignores = [...(options.ignores || []), 'color-contrast' // because we test color contrast in theme tests
    ];

    const violations = (axeResult.violations || []).filter(violation => !ignores.includes(violation.id));
    if (violations.length > 0) {
      result = new Error(formatError(violations));
    }
  } catch (err) {
    result = err;
  }
  return result;
}
function formatError(violations) {
  let msg = '';
  for (const violation of violations) {
    msg += `[${violation.id}] rule violation:\n`;
    for (const node of violation.nodes) {
      msg += `${node.failureSummary}:\n${node.html}\n`;
    }
    msg += `${violation.help} ${violation.helpUrl}\n`;
  }
  return msg;
}