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import { IParser, OnParse } from "./interfaces.ts";export class NilParser implements IParser<unknown, null | undefined> {  constructor(    readonly description = {      name: "Null",      children: [],      extras: [],    } as const,  ) {}  parse<C, D>(    a: unknown,    onParse: OnParse<unknown, null | undefined, C, D>,  ): C | D {    if (a === null || a === undefined) return onParse.parsed(a);
    return onParse.invalid({      value: a,      keys: [],      parser: this,    });  }}