Usage

For a complete walkthrough video please visit @ngworker/lumberjack v2 - Show & Tell BLS024

To register Lumberjack, add provideLumberjack() to your root or bootstrapApplication function.

bootstrapApplication(AppComponent, {
  providers: [
    // (...)
    provideLumberjack(),
    // (...)
  ],
});

You must also register the log driver provider functions for the log drivers that you want to enable.

If you want to add the LumberjackHttpDriver and the LumberjackConsoleDriver, add the following code

bootstrapApplication(AppComponent, {
  providers: [
    // (...)
    provideLumberjack(),
    provideLumberjackConsoleDriver(),
    provideLumberjackHttpDriver(withHttpConfig({...})),
    // (...)
  ],
});

Using the LumberjackService

For quick or simple use cases, you can use the LumberjackService directly by passing logs to its log method. However, we recommend implementing application-specific logger services instead. See the Best practices section.

First, inject the LumberjackService where you want to use it.

import { Component } from '@angular/core';
import { LumberjackService } from '@ngworker/lumberjack';

@Component({
  // (...)
})
export class MyComponent implements OnInit {
  constructor(private readonly lumberjack: LumberjackService) {}

  // (...)
}

or using the inject function

import { inject, Component } from '@angular/core';
import { LumberjackService } from '@ngworker/lumberjack';

@Component({
  // (...)
})
export class MyComponent implements OnInit {
  readonly #lumberjack = inject(LumberjackService);
  // (...)
}

Then we can start logging. However, you'll also want to inject LumberjackTimeService to maintain a high level of testability.

// (...)
import { LumberjackService, LumberjackTimeService } from '@ngworker/lumberjack';

// (...)
export class MyComponent implements OnInit {
  readonly #lumberjack = inject(LumberjackService);
  readonly #time = inject(LumberjackTimeService);

  // (...)
  ngOnInit(): void {
    this.#lumberjack.log({
      level: 'info',
      message: 'Hello, World!',
      scope: 'MyComponent',
      createdAt: this.#time.getUnixEpochTicks(),
    });
  }
}

Alternatively, you can also use the shorthand version:

// (...)
import { LumberjackService, LumberjackTimeService } from '@ngworker/lumberjack';

// (...)
export class MyComponent implements OnInit {
  readonly #lumberjack = inject(LumberjackService);
  readonly #time = inject(LumberjackTimeService);

  // (...)
  ngOnInit(): void {
    this.#lumberjack.logInfo('Hello, World!');
  }
}

Each log level has its associated shorthand version: 'info' is logInfo, 'debug' is logDebug, etc.

provideLumberjack

Optionally, we can pass one or more options to the provideLumberjack function.

Option	Type	Optional?	Description
format	(log: LumberjackLog) => string	Yes	Pass a custom formatter to transform a log into a log message.
levels	LumberjackConfigLevels	Yes	The root log levels defining the default log levels for log drivers.

Default options

Lumberjack's configuration is flexible. We can provide a full configuration object, a partial option set, or no options at all.

Lumberjack replaces omitted options with defaults.

When the format option is not configured, Lumberjack will use the following default formatter.

function lumberjackFormatLog({ scope, createdAt: timestamp, level, message }: LumberjackLog) {
  return `${level} ${utcTimestampFor(timestamp)}${scope ? ` [${scope}]` : ''} ${message}`;
}

Where utcTimestampFor is a function that converts Unix Epoch ticks to UTC 0 hours offset with milliseconds resolution.

Default log levels

When the levels setting is not configured, log levels are configured depending on whether our application runs in development mode or production mode.

By default, in development mode, all log levels are enabled.

By default, in production mode, the following log levels are enabled:

• Critical
• Error
• Info
• Warning