Simple logging system

This is a simple JavaScript logging system written in TypeScript.

By default, it outputs content to the console. However, it can be easily customized to output somewhere else.

This project can be a base to build a more complex logging system like SLF4J/Logback in Java.

Installation

Using NPM:

npm install simple-logging-system

Using Yarn:

yarn add simple-logging-system

Usage

const logger = new Logger('MyComponent');
logger.info('Hello world');

It supports multiple arguments:

const logger = new Logger('MyComponent');
try {
  throw new Error('Oops');
} catch (e) {
  logger.error('An error ocurred!', e);
}

It's easy to change logger appenders:

ApplicationLogger.setLoggerFunction((level: LoggerLevel, loggerName: string, message: string, ...args: any[]) => {
  // log messages to console
  ApplicationLogger.loggerConsole(level, loggerName, message, ...args);
  // also log messages to Datadog
  this.logToDatadog(level, loggerName, message, ...args);
});

Or logger appenders can just be added to the existing ones:

// also log messages to Datadog (and messages are still log to the console, by default)
ApplicationLogger.addLoggerFunction(this.logToDatadog);

So it's possible to:

• Check for logs in unit tests easily
• Send logs to servers on production

Release process

1. run npm login
2. run npm run release <= yarn must not be used