graphql-file-example-s3.js

// src/index.ts 
import { S3 } from 'aws-sdk'

// Creates S3 client
const s3client = new S3({
  accessKeyId: process.env.S3_KEY,
  secretAccessKey: process.env.S3_SECRET,
  params: {
    Bucket: process.env.S3_BUCKET
  }
})

// src/modules/fileApi.ts 

// Uploads a file to S3
const response = await s3.upload({
  Key: secret,
  ACL: 'public-read',
  Body: part,
  ContentLength: size,
  ContentType: contentType
}).promise()

// Saves untraceable url for database synchronisation 
const url = response.Location