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/**
* Returns a function that checks if an elements index matches the given rule
* highly optimized to return the fastest solution.
*
* @param parsed A tuple [a, b], as returned by `parse`.
* @returns A highly optimized function that returns whether an index matches the nth-check.
* @example
*
* ```js
* const check = nthCheck.compile([2, 3]);
*
* check(0); // `false`
* check(1); // `false`
* check(2); // `true`
* check(3); // `false`
* check(4); // `true`
* check(5); // `false`
* check(6); // `true`
* ```
*/
export declare function compile(parsed: [a: number, b: number]): (index: number) => boolean;
/**
* Returns a function that produces a monotonously increasing sequence of indices.
*
* If the sequence has an end, the returned function will return `null` after
* the last index in the sequence.
*
* @param parsed A tuple [a, b], as returned by `parse`.
* @returns A function that produces a sequence of indices.
* @example <caption>Always increasing (2n+3)</caption>
*
* ```js
* const gen = nthCheck.generate([2, 3])
*
* gen() // `1`
* gen() // `3`
* gen() // `5`
* gen() // `8`
* gen() // `11`
* ```
*
* @example <caption>With end value (-2n+10)</caption>
*
* ```js
*
* const gen = nthCheck.generate([-2, 5]);
*
* gen() // 0
* gen() // 2
* gen() // 4
* gen() // null
* ```
*/
export declare function generate(parsed: [a: number, b: number]): () => number | null;
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