Issues when targeting es5

[abariatti]

Hi,

On windows 10 / 64

Cloning the app,
npm install --global typescript webpack webpack-dev-server tslint
npm install
npm start

gives me a bunch of errors:

[at-loader] node_modules\@angular\core\src\facade\lang.d.ts:12:17
    'Map' only refers to a type, but is being used as a value here.

[at-loader] node_modules\@angular\core\src\facade\lang.d.ts:13:17
    'Set' only refers to a type, but is being used as a value here.

[at-loader] node_modules\@types\core-js\index.d.ts:47:36
    Cannot find name 'Iterable'.

[at-loader] node_modules\@types\core-js\index.d.ts:350:48
    Cannot find name 'PropertyKey'.

[at-loader] node_modules\@types\core-js\index.d.ts:351:52
    Cannot find name 'PropertyKey'.

Workaround:

On tsconfig.json
"target": "es5"
"target": "es6"

What should be done to target es5 correctly?