node/tools/eslint/lib/rules/no-obj-calls.js

/**
 * @fileoverview Rule to flag use of an object property of the global object (Math and JSON) as a function
 * @author James Allardice
 */

"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = function(context) {

    return {
        "CallExpression": function(node) {

            if (node.callee.type === "Identifier") {
                var name = node.callee.name;
                if (name === "Math" || name === "JSON") {
                    context.report(node, "'{{name}}' is not a function.", { name: name });
                }
            }
        }
    };

};

module.exports.schema = [];