Javascript developers like to write console.log, then cleanup, then write more, then cleanup ...

Java developers don't write a lot System.out.println. Developers have Logger.

Use Logger in your project. Use this one, or write your own. No more console.log please.

Create a Logger

import { Logger } from 'fsts';

const logger = new Logger('MyClass');

export default class MyClass {
    constructor() {
        logger.info('instance created');
    }

    doSomething() {
        somePromise()
            .then(data => logger.debug('some promise data', data))
            .catch(err => logger.error('some promise error', err));
    }
}

Log Level

Logger has level, by default it is 'WARN', so your .info and .debug would not write anything to conole. Set LOG_LEVEL to see debug logs in development mode.

Logger.LOG_LEVEL = 'DEBUG';

Or during debug, write window.LOG_LEVEL = 'DEBUG' in your console.

Log Levels:

• ERROR

• WARN

• INFO

• DEBUG

• VERBOSE