function setBinding( { keys, fn, target } ) {
  const keySets = parseKeys( keys );

  const { __reactKeydownUUID } = target;
  if ( !__reactKeydownUUID ) {
    target.__reactKeydownUUID = uuid();
    _handlers.set( target.__reactKeydownUUID, new Map( [ [ keySets, fn ] ] ) );
  } else {
    _handlers.get( __reactKeydownUUID ).set( keySets, fn );
  }
}
setBinding

@access public
@param {object} args All arguments necessary to set the binding
@param {array} args.keys Key codes that should trigger the fn
@param {function} args.fn The callback to be triggered when given keys are pressed
@param {object} args.target The decorated class