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I am trying to migrate from 5 to 6 using ng update and I get an error
Uncaught ReferenceError: Buffer is not defined at Object../node_modules/amazon-cognito-identity-js/node_modules/crypto-browserify/helpers.js (helpers.js:2) at __webpack_require__ (bootstrap:81) at Object../node_modules/amazon-cognito-identity-js/node_modules/crypto-browserify/md5.js (md5.js:10) at __webpack_require__ (bootstrap:81) at Object../node_modules/amazon-cognito-identity-js/node_modules/crypto-browserify/create-hash.js (create-hash.js:3) at __webpack_require__ (bootstrap:81) at Object../node_modules/amazon-cognito-identity-js/node_modules/crypto-browserify/index.js (index.js:12) at __webpack_require__ (bootstrap:81) at Object../node_modules/amazon-cognito-identity-js/es/AuthenticationHelper.js (vendor.js:47207) at __webpack_require__ (bootstrap:81) Local environment works well for creating the new angular project. I don't use Buffer. It is something behind the scenes
Any ideas?
UPD
I was trying to update @types/node npm install --save-dev @types/node
+ @types/[email protected] updated 1 package in 12.031s [!] 26 vulnerabilities found [36141 packages audited] Severity: 11 Low | 13 Moderate | 2 High Run `npm audit` for more detail if I run npm audit
npm ERR! code ENOAUDIT npm ERR! audit Your configured registry (https://registry.npmjs.org/) does not support audit requests. npm ERR! A complete log of this run can be found in: npm ERR! /Users/myname/.npm/_logs/2018-05-16T13_45_17_410Z-debug.log 
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Ok, after an hour I finally managed to have cognito working on my Angular app (just after upgrading to 6.0).
About the message global is not defined (or something close can't remember). Add the following into index.html:
<!doctype html> <html lang="en"> <head> ... <script> var global = global || window; </script> </head> Then, you'll probably get an error saying that Buffer is not defined.
Install the buffer package using npm or yarn. And add the following into polyfills.ts ():
global.Buffer = global.Buffer || require('buffer').Buffer; Stackoverflow answers/github issues that helped me in case it's not fixed for you after that:
Upgrading to angular-6.x gives "Uncaught ReferenceError: global is not defined"
https://github.com/aws/aws-amplify/issues/840#issuecomment-389459988
https://github.com/aws/aws-amplify/issues/678
https://github.com/aws/aws-amplify/issues/153
https://github.com/crypto-browserify/createHash/issues/20
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