Use an IIFE to avoid global variable collisions when the script is loaded more than once, see https://github.com/phetsims/phet-io-wrappers/issues/406
Use an IIFE to avoid global variable collisions when the script is loaded more than once, see https://github.com/phetsims/phet-io-wrappers/issues/406

phetsims/chipper,phetsims/chipper,phetsims/chipper