ami-cjs.js/src/helpers/helper.utils.js

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/**
 * check HTMLElement
 * @param {HTMLElement} obj
 * @return {boolean}
 */
export function isElement(obj) {
  try {
    // Using W3 DOM2 (works for FF, Opera and Chrom)
    return obj instanceof HTMLElement;
  } catch (e) {
    // Browsers not supporting W3 DOM2 don't have HTMLElement and
    // an exception is thrown and we end up here. Testing some
    // properties that all elements have. (works on IE7)
    return (typeof obj === 'object') &&
      (obj.nodeType === 1) && (typeof obj.style === 'object') &&
      (typeof obj.ownerDocument === 'object');
  }
}

/**
 * check string
 * @param {String} str
 * @return {Boolean}
 */
export function isString(str) {
  return typeof str === 'string' || str instanceof String;
}