/**
 * Serialize an object to a JSON string. Useful for easily creating JSON fetch request bodies.
 *
 * @param body - The object to be serialized to JSON.
 * @param replacer - The JSON.stringify replacer used when serializing.
 * @returns A JSON string.
 */
export declare function json(body: unknown, replacer?: (key: string, value: unknown) => unknown): string;
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