lib/graph-util.js
function addSetValues(args) {
  for (var key in args.from) {
    if (args.from[key]) {
      args.to[key] = true;
    }
  }
}
function addSetValues(args) {
  for (var key in args.from) {
    if (args.from[key]) {
      args.to[key] = true;
    }
  }
}
function addSetValues ( args ) { for ( var key in args . from ) { if ( args . from [ key ] ) { args . to [ key ] = true ; } } }
Makes 'to' the set union of 'from' and 'to'.
@param {!{from: !Object.<string, boolean>, to: !Object.<string, boolean>}}
args
Makes to the set union of from and to .