import { Append, AppendOptional, Concat, Length, List } from ".";
type _Init<L extends List, Acc extends unknown[] = []> = Length<L> extends 0 ? Acc : L extends readonly [any?] ? Acc : L extends readonly [infer H, ...infer T] ? _Init<T, Append<Acc, H>> : L extends readonly [...infer I, any] ? Concat<Acc, I> : L extends {
    0?: any;
} ? L extends readonly [_?: infer H, ...__: infer T] ? _Init<T, AppendOptional<Acc, H>> : Concat<Acc, L> : Concat<Acc, L>;
/**
 * gets all elements of list `L` except the last one.
 *
 * if `L` is empty, returns an empty list.
 *
 * @since 0.0.2
 *
 * @example
 * type e0 = Init<never>                          // []
 * type e1 = Init<[]>                             // []
 * type e2 = Init<[string]>                       // []
 * type e3 = Init<string[]>                       // string[]
 * type e4 = Init<[...string[], number]>          // string[]
 * type e5 = Init<[string, ...number[]]>          // [string, ...number]
 * type e6 = Init<[string, ...number[], boolean]> // [string, ...number]
 * type e7 = Init<[string?]>                      // []
 * type e8 = Init<[string?, ...number[]]>         // [(string | undefined)?, ...number[]]
 */
export type Init<L extends List> = _Init<L>;
export {};
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