index.js
function sightglass(obj, keypath, callback, options) {
    return new Observer(obj, keypath, callback, options)
  }
function sightglass(obj, keypath, callback, options) {
    return new Observer(obj, keypath, callback, options)
  }
function sightglass ( obj , keypath , callback , options ) { return new Observer ( obj , keypath , callback , options ) }
Public sightglass interface.
Public sightglass interface .