Javascript (Typescript): Remove empty properties from object

gistfile1.txt

  deleteEmptyProps(obj: any): any {
    // modifies passed obj in place, removing empty properties (inc. empty arrays)
    return Object.keys(obj).forEach(k => {
      if (!obj[k] || obj[k] === undefined ||
        Array.isArray(obj[k]) && obj[k].length === 0) {
        delete obj[k];
      }
    });
  }