rxjs / 7.5.5 / api / index / type-alias / cons.html /

Cons

type-alias stable

Constructs a new tuple with the specified type at the head. If you declare Cons<A, [B, C]> you will get back [A, B, C].

type Cons<X, Y extends readonly, any> = [];

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https://rxjs.dev/api/index/type-alias/Cons