Implement a new functionality to a publicly accessible type without violating the pre-established agreement

I'm looking to enhance an existing exported type with a new method, without causing any disruption to the current usage in production.

import * as BunyanLogger from 'bunyan';
import init from './logger';

export type Logger = BunyanLogger;

I attempted using an interface instead of the type but found that I would need to implement all methods from BunyanLogger.

My goal is to extend the Logger type with an additional method. I tried using intersection like this, but it didn't work:

export type Logger = BunyanLogger & {
  debugInPlace: (featureRole?:string, ...params: any[]) => void;
};

Is there a way to add a new method to the Logger type without having to fully re-implement or delegate to methods in the BunyanLogger type?

Answer №1

By incorporating the entire bunyan namespace and defining it as an interface, I successfully resolved the issue at hand.

import Logger from 'bunyan';
import * as bunyanLogger from "bunyan";

export class ExtendedLogger extends Logger implements bunyanLogger {
  constructor(options: Logger.LoggerOptions) {
    super(options);
  }
}

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