TLDR - Typescript Logging Done Right

Introduction

TLDR is a logging library driven by and designed for TypeScript. It follows the design and functionality of logrus. TLDR implements structured logging, which means that you can pass structured contexts into the library and evaluate them using a LMS lateron.

Usage Example

The example below is intended to be run in node, if you'd like to run it in the browser change NodeConsoleBackend to BrowserConsoleBackend.

/**
 * First of all, import all required classes and variables.
 * You need to import the logger as well as at least one backend.
 */
import { NodeConsoleBackend, Logger } from '@deinstapel/tldr';

/**
 * ConfigureInstance should be called **exactly** once.
 * Without configureInstance, all log messages will be dropped.
 * You might add global metadata here, for example your apps version
 * or a unique session ID for a specific app startup
 */
Logger.configureInstance({
  globalContext: { session: Math.round(Math.random() * 10000000) },
  backends: [new NodeConsoleBackend({
    color: true,
    formatting: 'human', // Can also be JSON
  })],
});

/**
 * Create a child logger with fields and log an info message
 */
Logger.withFields({
  var: 'foo',
  var2: 'bar',
  answer: 42,
}).info('hello, world');

/**
 * Annotate a single field and log a message with custom log level
 */
Logger.withField('answer', 42).log('customlevel', 'custom message')