Function getOwnEnumerables

src/object.ts:35–48

(obj: any, ignoreNull?: boolean)

 * @return {Array<String>} property names
 */
export function getOwnEnumerables(obj: any, ignoreNull?: boolean): Array<string> {
  if (!obj || typeof obj !== 'object' || Array.isArray(obj)) {
    return [];
  }
  return Object.keys(obj).filter(function(key) {
    if (ignoreNull) {
      const value = obj[key];
      if (value === null || value === undefined || Number.isNaN(value)) {
        return false;
      }
    }
    return has(obj, key);
  });
}

// faster way like `Object.create(null)` to get a 'clean' empty object
// https://github.com/nodejs/node/blob/master/lib/events.js#L5