How to use the tv4.tv4.validateResult function in tv4

Config.getLocal = function getLocal(file) {
            var cfg = new Config();
            var json;
            if(fs.existsSync(file)) {
                json = xm.FileUtil.readJSONSync(file);
                var schema = xm.FileUtil.readJSONSync(path.join(process.cwd(), 'schema', 'tsd-config_v4.json'));
                var res = tv4.validateResult(json, schema);
                if(!res.valid || res.missing.length > 0) {
                    console.log(res.error.message);
                    if(res.error.dataPath) {
                        console.log(res.error.dataPath);
                    }
                    if(res.error.schemaPath) {
                        console.log(res.error.schemaPath);
                    }
                    throw (new Error('malformed config: doesn\'t comply with schema'));
                }
                cfg.typingsPath = json.typingsPath;
                cfg.version = json.version;
                cfg.repo = json.repo;
                cfg.ref = json.ref;
            }
            return cfg;