Convert Callback Functions Into Promises With NodeJS Promisify Package

[Meddy369]

I am working on a small program using the aws-cli-js, and would like to use async and await instead of the callback based method. I have the following code:

// import packages cli and promisify
const awsCli = require('aws-cli-js'); 
const { promisify } = require('util');

// configure aws-cli-js
const Options = awsCli.Options;
const Aws = awsCli.Aws;
const options = new Options(accessKey, secretKey);
const aws = new Aws(options);

// promisifiy aws.command function
const awsCommandProm = promisify(aws.command);

async function getLambdas(){
      try {
        const response = await awsCommandProm('lambda list-functions');
        console.log(response)
      } catch (error) {
        console.error(error);
      }
}
const lambdaFunctions = getLambdas();

When the code executes the following error is thrown: TypeError: Cannot read properties of undefined (reading 'options') at command (/pathTo/node_modules/aws-cli-js/lib/index.js:49:37)

I used the promisify function from the node.js util package and know that it takes a function that is callback based and converts is to a promise based function. What am I doing wrong here?

[mattqs]

See https://github.com/Quobject/aws-cli-js#usage
Usage
With promise

var options = new Options(
  /* accessKey    */ 'your key',
  /* secretKey    */ 'your key2',
  /* sessionToken */ 'your token',
  /* currentWorkingDirectory */ null,
  /* cliPath */ 'aws'
);

var aws = new Aws(options);

aws.command('iam list-users').then(function (data) {
  console.log('data = ', data); 
});

//i.e.
var data = await aws.command('iam list-users');