code: function getCurrentScope(statementType) {
              let currentScope;
  
              if (statementType === "var") {
                  currentScope = functionStack[functionStack.length - 1];
              } else if (statementType === "let") {
                  currentScope = blockStack[blockStack.length - 1].let;
              } else if (statementType === "const") {
                  currentScope = blockStack[blockStack.length - 1].const;
              }
              return currentScope;
          }
docs: Determines the current scope (function or block)
  @param  {string} statementType node.kind, one of: "var", "let", or "const"
  @returns {Object} The scope associated with statementType