code: function isValidExpression(node) {
  			if (allowTernary) {
  				// Recursive check for ternary and logical expressions
  				if (node.type === "ConditionalExpression") {
  					return isValidExpression(node.consequent) && isValidExpression(node.alternate);
  				}
  			}
  			if (allowShortCircuit) {
  				if (node.type === "LogicalExpression") {
  					return isValidExpression(node.right);
  				}
  			}
  
  			return /^(?:Assignment|Call|New|Update|Yield)Expression$/.test(node.type) ||
  				(node.type === "UnaryExpression" && ["delete", "void"].indexOf(node.operator) >= 0);
  		}
docs: Determines whether or not a given node is a valid expression. Recurses on short circuit eval and ternary nodes if enabled by flags.
  @param {ASTNode} node - any node
  @returns {boolean} whether the given node is a valid expression