/**
 * Shared helpers for LLM providers.
 *
 * Both VertexLLMProvider and OpenAICompatibleLLMProvider need the same
 * pre-/post-processing logic around `generateJSON`. Keeping the helpers
 * here means a fix (e.g. handling a new fence dialect) lands in one place.
 */
/**
 * Strip common code-fence wrappers from LLM JSON output.
 *
 * Models often return ```json\n{...}\n``` or plain ```\n{...}\n```; the
 * fences must be stripped before JSON.parse. Returns the trimmed inner
 * payload, or the original (trimmed) text if no fences are present.
 */
export declare function stripJsonFences(text: string): string;
/**
 * Build a system prompt that appends a JSON-schema instruction.
 *
 * If both `base` and `schema` are provided, the schema instruction is
 * appended with a blank line separator. If only `schema` is provided,
 * the schema instruction alone is returned. If neither is provided,
 * returns an empty string.
 */
export declare function buildJsonSystemPrompt(base: string | undefined, schema: unknown): string;
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