/**
 * PreToolUse input parsing and signal extraction
 */
import type { PreToolUseInput, ExtractedSignals } from './types.js';
/**
 * Detects whether parsed JSON data is from a PreToolUse hook
 * by checking for the presence of a string `tool_name` field.
 */
export declare function isPreToolUseInput(data: unknown): boolean;
/**
 * Parses PreToolUse hook input from a JSON string.
 *
 * @param jsonString - Raw JSON string from stdin
 * @returns Validated PreToolUseInput
 * @throws Error if input is empty, invalid JSON, missing tool_name, or unsupported tool
 */
export declare function parsePreToolUseInput(jsonString: string): PreToolUseInput;
/**
 * Extracts file-path-based signals from tool_input.
 *
 * @param toolInput - The tool_input object from PreToolUse stdin
 * @param projectDir - The project directory to strip from absolute paths
 * @returns ExtractedSignals with words, extensions, and paths from the file path
 */
export declare function extractToolSignals(toolInput: Record<string, unknown>, projectDir: string): ExtractedSignals;
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