here is an easy one :)

OS

Mac OSX Sierra 10.12.3

Versions

@angular/cli: 1.0.0-rc.1
node: 6.9.1
os: darwin x64
@angular/common: 2.4.9
@angular/compiler: 2.4.9
@angular/core: 2.4.9
@angular/forms: 2.4.9
@angular/http: 2.4.9
@angular/platform-browser: 2.4.9
@angular/platform-browser-dynamic: 2.4.9
@angular/router: 3.4.9
@angular/cli: 1.0.0-rc.1
@angular/compiler-cli: 2.4.9

Repro steps.

ng new foo --ng4
ng eject

Notice the eject command removes the EOF from tsconfig.app.json