paambaati/reading-between-the-lines

/**
 * Logger utility.
 */

import pino from 'pino';

export default class Logger {
  private options: pino.LoggerOptions;
  /**
   * Logger instance.
   * @memberof Logger
   */
  public logger: pino.Logger;
  /**
   * Creates an instance of Logger.
   * @param {string} appName Name of the app/module.
   * @param {pino.LoggerOptions} options Logger options.
   * @memberof Logger
   */
  constructor(private appName: string, options?: pino.LoggerOptions) {
    if (!options) {
      this.options = {
        name: this.appName,
        // Log levels - https://github.com/pinojs/pino/blob/master/docs/API.md#discussion-3
        level: process.env.LOG_LEVEL || 'info',
        useLevelLabels: true
      };
    } else {
      this.options = {
        name: this.appName,
        ...options
      };
    }
    this.options.enabled = this.options.level !== 'silent';
    this.options.serializers = {
      err: pino.stdSerializers.err
    };
    this.logger = pino(this.options);
    return this;
  }
}