Review

class PeepholeSubstituteAlternateSyntax {
  /**
   * Reduce "return undefined" or "return void 0" to simply "return".
   *
   * @return The original node, maybe simplified.
   */
  private Node tryReduceReturn(Node n) {
    Node result = n.getFirstChild();

    if (result != null) {
      switch (result.getType()) {
        case Token.VOID:
          Node operand = result.getFirstChild();
          if (!mayHaveSideEffects(operand)) {
            n.removeFirstChild();
            reportCodeChange();
          }
          break;
        case Token.NAME:
          String name = result.getString();
          if (name.equals("undefined")) {
            n.removeFirstChild();
            reportCodeChange();
          }
          break;
      }
    }

    return n;
  }

}