`ng add ngxtension` fails without "compilerOptions".

[Nvveen]

I have a base tsconfig.json that just references other tsconfig.json files in my project:

{
    "files": [],
    "references": [
        {
            "path": "./src/tsconfig.app.json"
        },
        {
            "path": "./src/tsconfig.spec.json"
        }
    ]
}

If I ng add ngxtension I get an error: Cannot use 'in' operator to search for 'skipLibCheck' in undefined. If I add an empty "compilerOptions": {} the command works again. This step isn't needed in the first place for me, because I already have the skipLibCheck option in tsconfig.base.json, but it would be nice if the generator would shot a warning or something instead.