element-vir/dist/util/increment.d.ts

Heroic. Reactive. Declarative. Type safe. Web components without compromise.

import { type ArrayElement } from '@augment-vir/common';
import { type IsNever } from 'type-fest';
/**
 * The largest number in this tuple is the largest number of nestings of the same element that
 * `element-vir` will support with types (in runtime it'll support any level of nesting the same
 * element).
 *
 * @category Internal
 */
export type Incrementable = [
    0,
    1,
    2,
    3,
    4,
    5,
    6,
    7,
    8,
    9,
    10,
    11,
    12,
    13,
    14,
    15,
    16,
    17,
    18,
    19,
    20,
    21,
    22,
    23,
    24,
    25,
    26,
    27,
    28,
    29,
    30
];
/**
 * Increments the given number. If an invalid type parameter is given, it is treated as `0` and this
 * will output `1`. If the upper bound of increments has been reached, this will output `never`.
 *
 * @category Internal
 */
export type Increment<T> = IsNever<Extract<ArrayElement<Incrementable>, T>> extends true ? IsNever<T> extends true ? 1 : never : Incrementable extends [any, ...infer Rest] ? T extends keyof Rest ? Rest[T] extends undefined ? never : Rest[T] : 1 : 1;
/**
 * Decrements the given number. If an invalid type parameter is given, `never` is the output.
 *
 * @category Internal
 */
export type Decrement<T> = IsNever<Extract<ArrayElement<Incrementable>, T>> extends true ? never : T extends keyof Incrementable ? [never, ...Incrementable][T] : never;