leo-logger

Leo-Logger

Such an awesome logger that we had to break it out from the LEO SDK and make it its own project!

Available methods

• sub
• info
• json
• time
• timeEnd
• log
• debug
• error
• warn
• trace
• configure

Available configuration options

• a = all
• t = time
• i = info
• d = debug
• e = error
• w = warn
• x = trace
• j = json
• T = printTimestamp

Usage example:

export LEO_LOGGER='/.*/d'

export LEO_LOGGER='/my-logger/wei;/.*/ei'

Working with namespaces

You can log logs for specific namespaces by passing a string when requiring the leo-logger. Example:

const logger = require('leo-logger')('my-special-namespace');

When you use a namespace, logging works the same, but the output will be prefixed with the namespace:

logger.log('My namespaced log');
// outputs: my-special-namespace my namespaced log

If you want to display logs for certain namespaces only, you can adjust LEO_LOGGER to match the namespace.

# Example outputting all logs for my-special-namespace
export LEO_LOGGER='/my\-special\-namespace/a'

You may notice in the previous example how it appears we’re using regex. This allows you to employ more powerful namespace logging. As an example, let’s say you have a shopping cart, and you want to have logs specific to the checkout process. Each of the checkout pages would include the leo-logger. I'm going to use an example of 2 checkout pages, which would look like this:

const logger = require('leo-logger')('checkout-payment');

const logger = require('leo-logger')('checkout-process-order');

Then if you want to display logs for the process-order page, you would do this:

export LEO_LOGGER='/checkout\-process\-order/a'

But if you want to display logs for all checkout pages, you can use the power of regex to select everything starting with “checkout”:

export LEO_LOGGER='/checkout.*/a'

Loggers

logger.log('my logged message');
logger.info('my info');
logger.debug('just some debugging code');

Timers

// start a timer
logger.time('myTimer');
// stop a timer
logger.timeEnd('endTimer');

To-Do

More documentation with examples with code and output.

Support

Want to hire an expert, or need technical support? Reach out to the Leo team: https://leoinsights.com/contact