@aws-amplify/ui-react doesn't transpile ES6 to ES5

[ericclemmons]

Describe the bug

Originally discovered by @sawyerh: #5282 (comment)

When using @aws-amplify/ui-react in a Next.js project, I get:

node_modules/@aws-amplify/ui-react/dist/index.js:1
export * from './components'
^^^^^^

SyntaxError: Unexpected token 'export'

To Reproduce
Steps to reproduce the behavior:

1. yarn create next-app

2. Update pages/index.tsx with:

    import { withAuthenticator } from '@aws-amplify/ui-react'

3. http://localhost:3000/

Expected behavior

Work like aws-amplify-react does.

Screenshots

Environment

  System:
    OS: macOS Mojave 10.14.6
    CPU: (4) x64 Intel(R) Core(TM) i7-7660U CPU @ 2.50GHz
    Memory: 234.59 MB / 16.00 GB
    Shell: 5.7.1 - /usr/local/bin/zsh
  Binaries:
    Node: 10.16.3 - ~/.nvm/versions/node/v10.16.3/bin/node
    Yarn: 1.22.0 - /usr/local/bin/yarn
    npm: 6.9.0 - ~/.nvm/versions/node/v10.16.3/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Browsers:
    Chrome: 80.0.3987.149
    Firefox: 68.6.0
    Safari: 13.1
  npmPackages:
    @aws-amplify/ui-react: unstable => 0.2.2-unstable.3+bb17bcb83
    @types/node: ^13.9.1 => 13.11.0
    @types/react: ^16.9.23 => 16.9.32
    aws-amplify: unstable => 3.0.7-unstable.3+bb17bcb83
    next: latest => 9.3.4
    react: latest => 16.13.1
    react-dom: latest => 16.13.1
    typescript: ^3.8.3 => 3.8.3
  npmGlobalPackages:
    @aws-amplify/cli: 4.13.3
    create-react-app: 3.1.1
    npm: 6.9.0
    pure-prompt: 1.10.3

[ericclemmons]

Potential solution: #5282 (comment)

[github-actions]

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