code: function isCallback(node) {
              return containsOnlyIdentifiers(node.callee) && callbacks.indexOf(sourceCode.getText(node.callee)) > -1;
          }
docs: 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.