/** @module TypeScript: Nested Types */
/**
 * Prev is a long tuple that you can use to get the previous number (up to a max value). So Prev[3] is 2, and Prev[1] is 0. This limits the depth of recursion as we proceed deeper into the object tree.
 * Taken from https://newbedev.com/typescript-deep-keyof-of-a-nested-object
 */
export type Prev = [
    never,
    0,
    1,
    2,
    3,
    4,
    5,
    6,
    7,
    8,
    9,
    10,
    11,
    12,
    13,
    14,
    15,
    16,
    17,
    18,
    19,
    20,
    ...0[]
];
/**
 * Join concatenates two strings with a dot in the middle, unless the last string is empty.
 * So Join<"a","b.c"> is "a.b.c" while Join<"a",""> is "a".
 * Taken from https://newbedev.com/typescript-deep-keyof-of-a-nested-object
 * @typeParam L The left side of the string
 * @typeParam R The right side of the string
 */
export type Join<L, R> = L extends string | number ? R extends string | number ? `${L}${"" extends R ? "" : "."}${R}` : never : never;
/**
 * Leaves is a union of all nested elements of T which are not object types.
 * Taken from https://newbedev.com/typescript-deep-keyof-of-a-nested-object
 * @typeParam T The object from which leaves are derived.
 * @typeParam D The maximum allowed depth of recursion.
 */
export type Leaves<T, D extends number = 3> = [D] extends [never] ? never : T extends object ? {
    [K in keyof T]-?: Join<K, Leaves<T[K], Prev[D]>>;
}[keyof T] : "";
/**
 * Paths is a union of all nested elements of T.
 * Taken from https://newbedev.com/typescript-deep-keyof-of-a-nested-object
 * @typeParam T The object from which leaves are derived.
 * @typeParam D The maximum allowed depth of recursion.
 */
export type Paths<T, D extends number = 2> = [D] extends [never] ? never : T extends object ? {
    [K in keyof T]-?: K extends string | number ? `${K}` | Join<K, Paths<T[K], Prev[D]>> : never;
}[keyof T] : "";
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