Run fails with es2015

[LanderBeeuwsaert]

• [ xx] build

Is this a regression?

Nope

Description

So, because of #12112 I tried to do a build & serve with tsconfig.json target set to es2015.
The build itself succeeds, the serve also, well quite, because when I browse to it, the browser screen just stays white and in the console:

Authentication is a service class that should normally be injected in the helpers services class.
This works in es5.
The build configuration is:
"env-t-as-dev": {
"optimization": false,
"outputHashing": "all",
"sourceMap": true,
"extractCss": true,
"namedChunks": false,
"aot": false,
"extractLicenses": false,
"vendorChunk": false,
"buildOptimizer": false,
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/env-t-as-dev.ts"
}
]
},

If you want more info, feel free to ask.

[alan-agius4]

closing as doesn't follow template

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