test.js

const core = require('@optimizely/js-sdk-core')
// this will prefix all log messages with 'myModuleName: '
const logger = createLogger('myModuleName')

logger.log(core.LogLevel.INFO, 'same .log() API as before')

// or you can use debug / info / warn / error
logger.debug('this is a debug message')
logger.info('this is an info message')
logger.warn('this is a warning')
logger.error('this is an error')


// you can also pass arguments to string interpolate
// the benefit of doing it this way is it wont be evaluated
// unless the log level should log
logger.info('user got variation "%s" for experiment "%s"', variationKey, experimentKey)
logger.error('error occurred: "%s"', ex.message)


// if the last argument passed is an error object, it will call errorHandler.handlerError
logger.warn("i got an error", ex)
// if only an error is passed it will log ex.message and call errorHandler.handlerError
logger.error(ex)