/**
 * In the past, name of `typia` was `typescript-json`, and supported
 * JSON serialization by wrapping `fast-json-stringify. `typescript-json` was
 * a helper library of `fast-json-stringify`, which can skip manual JSON schema
 * definition just by putting pure TypeScript type.
 *
 * This `$string` function is a part of `fast-json-stringify` at that time, and
 * still being used in `typia` for the string serialization.
 *
 * @reference https://github.com/fastify/fast-json-stringify/blob/master/lib/serializer.js
 * @blog https://dev.to/samchon/good-bye-typescript-is-ancestor-of-typia-20000x-faster-validator-49fi
 */
export declare const _jsonStringifyString: (str: string) => string;