How to properly deal with promisifyAll in typescript?

I'm solving this by declaration merging the setAsync & getAsync methods. I added the following code in my own custom .d.ts file.

declare module "redis" {

    export interface RedisClient extends NodeJS.EventEmitter {
        setAsync(key:string, value:string): Promise<void>;
        getAsync(key:string): Promise<string>;
    }

}

Another way to do it which requires less code is to extend the Redis object like so:

import { promisify } from 'util';
import { ClientOpts, RedisClient } from 'redis';

class AsyncRedis extends RedisClient {
  public readonly getAsync = promisify(this.get).bind(this);
  public readonly setAsync = promisify(this.set).bind(this);
  public readonly quitAsync = promisify(this.quit).bind(this);
  public readonly rpushAsync: (list: string, item: string) => Promise<number> = promisify(
    this.rpush
  ).bind(this);
  public readonly blpopAsync: (
    list: string,
    timeout: number
  ) => Promise<[string, string]> = promisify(this.blpop).bind(this);
  public readonly flushdbAsync = promisify(this.flushdb).bind(this);
}

Notice that not all method signatures overwrite correctly, so you have to help typescript a little.

Now you can just use this enhanced class by creating it with your options, for example:

new AsyncRedis({
  host: process.env.REDIS_HOST || '127.0.0.1',
  password: process.env.REDIS_PASSWORD || 'whatever',
 });