loglevel Transport for LogLayer

A transport for using loglevel with LogLayer.

Installation

npm install @loglayer/transport-loglevel loglevel

Usage

import { LogLayer } from 'loglayer';
import { LogLevelTransport } from '@loglayer/transport-loglevel';
import log from 'loglevel';

const logger = log.getLogger('myapp');
logger.setLevel('trace'); // Enable all log levels

const loglayer = new LogLayer({
  transport: new LogLevelTransport({
    logger,
    // Optional: control where object data appears in log messages
    appendObjectData: false // default: false - object data appears first
  })
});

loglayer.info('Hello world');

Configuration Options

appendObjectData

Controls where object data (metadata, context, errors) appears in the log messages:

• false (default): Object data appears as the first parameter
• true: Object data appears as the last parameter

Example with appendObjectData: false (default):

loglayer.withMetadata({ user: 'john' }).info('User logged in');
// logger.info({ user: 'john' }, 'User logged in')

Example with appendObjectData: true:

loglayer.withMetadata({ user: 'john' }).info('User logged in');
// logger.info('User logged in', { user: 'john' })

Log Level Mapping

| LogLayer | LogLevel | |----------|----------| | trace | trace | | debug | debug | | info | info | | warn | warn | | error | error | | fatal | error |