このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
cannot find name 'aws'
対処
関連リンク
Cannot get aws-sdk working with Angular universal ・ Issue #1944 ...
https://github.com/aws/aws-sdk-js/issues/1944
Typescript error: Cannot find name 'Buffer'/'http'/'https' - GitHub
https://github.com/aws/aws-sdk-js/issues/1271
Angular 7でAWS Amplifyを使おうとしたらCannot find name - Playful IT
https://playfulit.net/articles/angular-7-aws-amplify-cannot-find-name-buffer-error
Angularでaws-amplifyを利用する場合のエラー対策 - Qiita
https://qiita.com/Junpei_Takagi/items/d43fcbb63b867dba99e8
JavascriptのAWS SDKをAngular2/4で使ったらめっちゃエラー出た件 ...
http://tossy-yukky.hatenablog.com/entry/2017/06/19/184926
integrating aws-sdk to angular2 gives "Cannot find module 'stream ...
https://stackoverflow.com/questions/43017736/integrating-aws-sdk-to-angular2-gives-cannot-find-modul・・・
How to configure aws-sdk in Angular 7
https://stackoverflow.com/questions/54035140/how-to-configure-aws-sdk-in-angular-7
Ionic AWS Error
https://stackoverflow.com/questions/49088821/ionic-aws-error
cannot find name 'Buffer' in ionic app when integrating ...
https://stackoverflow.com/questions/44775350/cannot-find-name-buffer-in-ionic-app-when-integrating-a・・・
How do I use AWS sdk definitions for TypeScript?
https://stackoverflow.com/questions/33225183/how-do-i-use-aws-sdk-definitions-for-typescript