Can I extend a Typescript tuple type?

Question

Say I have a Typescript tuple:

type Sandwich = [name: string, toppings: object]

Now I want to extend it:

type HotDog = [name: string, toppings: object, length: number]

Can HotDog extend Sandwich without duplication?

Answer 1

Just spread one into the other:

type Sandwich = [name: string, toppings: object]
type HotDog = [...sandwich: Sandwich, length: number]
//   ^ type is [name: string, toppings: object, length: number]

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