// Example:
interface IPackagingInfoController {
    [prop: string]: any,
    selectedProductionGroup?: IProductionGroup;
}


// or:
interface AnyProperties {
    [prop: string]: any
}
type MyType = AnyProperties & {
    findAll(): string[]
}
let a: MyType
a.findAll() // OK, with autocomplete
a.abc = 12 // OK, but no autocomplete