Review

class PeepholeSubstituteAlternateSyntax {
  /**
   * Does the expression contain a property assignment?
   */
  private boolean isPropertyAssignmentInExpression(Node n) {
    Predicate<Node> isPropertyAssignmentInExpressionPredicate =
        new Predicate<Node>() {
      @Override
      public boolean apply(Node input) {
        return (input.getType() == Token.GETPROP &&
            input.getParent().getType() == Token.ASSIGN);
      }
    };

    return NodeUtil.has(n, isPropertyAssignmentInExpressionPredicate,
        DONT_TRAVERSE_FUNCTIONS_PREDICATE);
  }

}