interface/index.d.ts at main · lgriffith3428/interface · GitHub

Repository navigation

declare type Address = string

declare type AddressTo<T> = Record<Address, T>

declare type Nullable<T> = T | null

declare type Maybe<T> = Nullable<T> | undefined

declare type ValuesOf<T extends readonly unknown[]> = T[number]

declare type ArrayOfLength<L extends number, T, Acc extends T[] = []> = Acc['length'] extends L

? Acc extends []

? L extends 0

? []

: T[]

: Acc

: ArrayOfLength<L, T, [...Acc, T]>

declare type Require<T, K extends keyof T> = T & Required<Pick<T, K>>

declare type RequireNonNullable<T, K extends keyof T> = T & { [P in K]-?: NonNullable<T[P]> }

// Utility type to create a range of numbers (inclusive of start but exclusive of end -- python style)

declare type NumberRange<

Start extends number,

End extends number,

Acc extends number[] = []

> = Acc['length'] extends End ? Acc[number] : NumberRange<Start, End, [...Acc, Acc['length'] & number]>