/**
 * Hook input parsing
 */
import type { HookInput, PreToolUseInput, SubagentHookInput } from './types.js';
/**
 * Discriminated union for stdin input types
 */
export type StdinInput = {
    kind: 'prompt';
    input: HookInput;
} | {
    kind: 'tooluse';
    input: PreToolUseInput;
};
/**
 * Parses stdin JSON and dispatches to the appropriate parser based on shape.
 *
 * If the data contains a `tool_name` field, it's treated as PreToolUse input.
 * Otherwise, it's treated as a prompt-based hook input (UserPromptSubmit/SubagentStart).
 *
 * @param jsonString - Raw JSON string from stdin
 * @returns Discriminated StdinInput union
 * @throws Error if input is empty, invalid JSON, or validation fails
 */
export declare function parseStdinInput(jsonString: string): StdinInput;
/**
 * Parses hook input from JSON string.
 *
 * @param jsonString - Raw JSON string from stdin
 * @returns Validated HookInput
 * @throws Error if input is empty, invalid JSON, or missing required fields
 */
export declare function parseHookInput(jsonString: string): HookInput;
/**
 * Builds a SubagentHookInput from a parsed stdin payload, keeping only
 * string-typed fields and defaulting session_id.
 */
export declare function buildSubagentInput(obj: Record<string, unknown>): SubagentHookInput;
/**
 * Reads input from stdin synchronously.
 *
 * @returns Raw string from stdin
 */
export declare function readStdin(): string;
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