@ember/test-helpers/dist/dom/-logging.js

Helpers for testing Ember.js applications

/**
 * Logs a debug message to the console if the `testHelperLogging` query
 * parameter is set.
 *
 * @private
 * @param {string} helperName Name of the helper
 * @param {string|Element} target The target element or selector
 */
function log(helperName, target, ...args) {
  if (loggingEnabled()) {
    // eslint-disable-next-line no-console
    console.log(`${helperName}(${[elementToString(target), ...args.filter(Boolean)].join(', ')})`);
  }
}

/**
 * Returns whether the test helper logging is enabled or not via the
 * `testHelperLogging` query parameter.
 *
 * @private
 * @returns {boolean} true if enabled
 */
function loggingEnabled() {
  return typeof location !== 'undefined' && location.search.indexOf('testHelperLogging') !== -1;
}

/**
 * This generates a human-readable description to a DOM element.
 *
 * @private
 * @param {*} el The element that should be described
 * @returns {string} A human-readable description
 */
function elementToString(el) {
  let desc;
  if (el instanceof NodeList) {
    if (el.length === 0) {
      return 'empty NodeList';
    }
    desc = Array.prototype.slice.call(el, 0, 5).map(elementToString).join(', ');
    return el.length > 5 ? `${desc}... (+${el.length - 5} more)` : desc;
  }
  if (!(el instanceof HTMLElement || el instanceof SVGElement)) {
    return String(el);
  }
  desc = el.tagName.toLowerCase();
  if (el.id) {
    desc += `#${el.id}`;
  }
  if (el.className && !(el.className instanceof SVGAnimatedString)) {
    desc += `.${String(el.className).replace(/\s+/g, '.')}`;
  }
  Array.prototype.forEach.call(el.attributes, function (attr) {
    if (attr.name !== 'class' && attr.name !== 'id') {
      desc += `[${attr.name}${attr.value ? `="${attr.value}"]` : ']'}`;
    }
  });
  return desc;
}

export { elementToString, log };
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