/**
 * AST-based preprocessing for toolEval code strings.
 *
 * Detects common LLM patterns that produce no return value and rewrites
 * the code so the result is captured:
 * - Bare expressions without `return` → auto-return the last expression
 * - Defined-but-not-called functions → auto-call the single uncalled one
 */
/**
 * Preprocess a code string before passing to AsyncFunction.
 *
 * If the code already has a top-level `return`, it is returned unchanged.
 * Otherwise:
 * - If the last statement is an expression, wraps it with `return (...)`.
 * - If there is exactly one uncalled top-level function declaration,
 *   appends `return await name()`.
 * - On parse failure, throws the acorn SyntaxError (includes line:column).
 */
export declare function preprocessCode(code: string): string;
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