offset = (options, ...objects) => {
  objects = flatten(objects)
  if (objects.length === 0) throw new Error('wrong number of arguments')

  const results = objects.map((object) => {
    if (path2.isA(object)) return offsetPath2(options, object)
    if (geom2.isA(object)) return offsetGeom2(options, object)
    // if (geom3.isA(object)) return geom3.transform(matrix, object)
    return object
  })
  return results.length === 1 ? results[0] : results
}
Create offset geometry from the given geometry using the given options.
Offsets from internal and external space are created.
@param {Object} options - options for offset
@param {Float} [options.delta=1] - delta of offset (+ to exterior, - from interior)
@param {String} [options.corners='edge'] - type of corner to create after offseting; edge, chamfer, round
@param {Integer} [options.segments=16] - number of segments when creating round corners
@param {...Object} objects - the geometries to offset
@return {Object|Array} new geometry, or list of new geometries
@alias module:modeling/expansions.offset

@example
let small = offset({ delta: -4, corners: 'chamfer' }, square({size: 40})) // contract