export declare const JSON_BUF_PROPERTY = "__json_buf";
/**
 * Copies a tool-use block with an updated `__json_buf`, installing `.input` as
 * a memoized getter so the partial-JSON parse happens on first read instead of
 * on every delta.
 */
export declare function withLazyInput<T extends {
    input: unknown;
}>(prev: T, jsonBuf: string): T;
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