TypeScript / Node utilize credential_process in for AWS profile to access S3

s3.ts

import * as https from 'https';
import * as AWS from 'aws-sdk';
import { execFileSync } from 'child_process';
import * as process from 'process';

const REGION = process.env.AWS_REGION || 'us-east-1';
const { CREDENTIALS_PROCESS } = process.env;

export const createDefaultConfiguration = async (): Promise<AWS.S3.ClientConfiguration> => {
    const config = {
        REGION,
        httpOptions: {
            agent: new https.Agent({
                rejectUnauthorized: false,
            }),
        },
    };
    // extract from 'credentials_process' that returns a json object to std out
    if (CREDENTIALS_PROCESS) {
        const credentialChain = new AWS.CredentialProviderChain();
        const creds = JSON.parse(execFileSync(CREDENTIALS_PROCESS).toString());
        credentialChain.providers.unshift(
            new AWS.Credentials({
                accessKeyId: creds.AccessKeyId,
                secretAccessKey: creds.SecretAccessKey,
                sessionToken: creds.SessionToken,
            })
        );
        return {
            ...config,
            credentials: await credentialChain.resolvePromise(),
        };
    }
    return config;
};

const getS3 = async () => {
    return new AWS.S3({
        ...(await createDefaultConfiguration()),
        apiVersion: '2006-03-01',
    });
};