const log4js = require('../lib/log4js'); log4js.configure({ appenders: { console: { type: 'console', }, file: { type: 'file', filename: 'tmp-test.log', maxLogSize: 1024, backups: 3, }, }, categories: { default: { appenders: ['console', 'file'], level: 'info' }, }, }); const log = log4js.getLogger('test'); function doTheLogging(x) { log.info('Logging something %d', x); } let i = 0; for (; i < 5000; i += 1) { doTheLogging(i); }