Type alias DeepType<T, Path>

Picks a type of nested property.

Example

Given a complex object structure:

interface Company {
  id: number;
  name: string;
  description?: string;
  address: Address;
}

interface Address {
  country: string;
  region: string;
  street: Street;
  building: string;
}

interface Street {
  name: string;
  type: string;
}

Use it to pick a type of nested property:

DeepType<Company, ['id']> == number
DeepType<Company, ['name']> == string
DeepType<Company, ['description']> == string | undefined
DeepType<Company, ['some']> == never
DeepType<Company, ['address']> == Address
DeepType<Company, ['address', 'country']> == string
DeepType<Company, ['address', 'street']> == Street
DeepType<Company, ['address', 'street', 'name']> == string