function isVariableDeclaration(node) {
			return (
				node.type === "VariableDeclaration" ||
				(node.type === "ExportNamedDeclaration" &&
					node.declaration &&
					node.declaration.type === "VariableDeclaration")
			);
		}
Checks whether a given node is a variable declaration or not.
@param {ASTNode} node any node
@returns {boolean} `true` if the node is a variable declaration.