@triviality/logger/src/PrefixLogger.ts

Typescript loggers with an interface that support composition

import { LoggerInterface, LogLevel } from './LoggerInterface';
import { AbstractLogLevelLogger } from './AbstractLogLevelLogger';

export class PrefixLogger extends AbstractLogLevelLogger implements LoggerInterface {

  public static with(logger: LoggerInterface,
                     prefix: string): LoggerInterface {
    return new this(logger, prefix);
  }

  constructor(private readonly logger: LoggerInterface,
              private readonly prefix: string) {
    super();
  }

  public log(level: LogLevel, message?: any, ...optionalParams: any[]) {
    this.logger.log(level, this.prefix + message, ...optionalParams);
  }

}