code: function isExpression(node) {
          switch (node.type) {
          case Syntax.AssignmentExpression:
          case Syntax.ArrayExpression:
          case Syntax.ArrayPattern:
          case Syntax.BinaryExpression:
          case Syntax.CallExpression:
          case Syntax.ConditionalExpression:
          case Syntax.ClassExpression:
          case Syntax.ExportBatchSpecifier:
          case Syntax.ExportSpecifier:
          case Syntax.FunctionExpression:
          case Syntax.Identifier:
          case Syntax.ImportDefaultSpecifier:
          case Syntax.ImportNamespaceSpecifier:
          case Syntax.ImportSpecifier:
          case Syntax.Literal:
          case Syntax.LogicalExpression:
          case Syntax.MemberExpression:
          case Syntax.MethodDefinition:
          case Syntax.ModuleSpecifier:
          case Syntax.NewExpression:
          case Syntax.ObjectExpression:
          case Syntax.ObjectPattern:
          case Syntax.Property:
          case Syntax.SequenceExpression:
          case Syntax.ThisExpression:
          case Syntax.UnaryExpression:
          case Syntax.UpdateExpression:
          case Syntax.YieldExpression:
              return true;
          }
          return false;
      }
docs: Generation is done by generateExpression.