My question is about the error:

 Uncaught ReferenceError: require is not defined

Code:

const AWS = require('aws-sdk')

const s3 = new AWS.S3()
AWS.config.update({accessKeyId: 'key id', secretAccessKey: 'access key'})

const myBucket = 'bucket name'
const myKey = 'key path'
const signedUrlExpireSeconds = 60 * 5 // your expiry time in seconds.

const url = s3.getSignedUrl('getObject', {
Bucket: myBucket,
Key: myKey,
Expires: signedUrlExpireSeconds