function isCallback(node) {
            return (
                containsOnlyIdentifiers(node.callee) &&
                callbacks.indexOf(sourceCode.getText(node.callee)) > -1
            )
        }
Check to see if a CallExpression is in our callback list.
@param {ASTNode} node The node to check against our callback names list.
@returns {boolean} Whether or not this function matches our callback name.