lib/rules/no-unsupported-features.js
function extendsNull(node) {
            return (
                node.superClass != null &&
                node.superClass.type === "Literal" &&
                node.superClass.value === null
            )
        }
function extendsNull(node) {
            return (
                node.superClass != null &&
                node.superClass.type === "Literal" &&
                node.superClass.value === null
            )
        }
Checks whether the given class extends from null or not.

@param {ASTNode} node - The class node to check.
@returns {boolean} `true` if the class extends from null.