/**
 * Preprocessor for reducing AI token usage
 *
 * Provides functions to compress code snippets before sending to LLM:
 * - Remove comments (single-line and multi-line)
 * - Collapse multiple blank lines
 * - Extract only changed functions/classes
 * - Summarize unchanged context
 */
import type { FileSnippet } from '../parsers/file-reader.js';
export interface PreprocessOptions {
    /** Strip single-line (//) and multi-line (block) comments */
    removeComments: boolean;
    /** Collapse multiple consecutive blank lines into one */
    removeBlankLines: boolean;
    /** Only include lines within changed functions/classes */
    extractChangedOnly: boolean;
    /** Replace large unchanged blocks with summaries */
    summarizeContext: boolean;
    /** Minimum lines to trigger summarization */
    summarizeThreshold: number;
}
export declare const DEFAULT_PREPROCESS_OPTIONS: PreprocessOptions;
/**
 * Remove single-line comments (//) from code
 */
export declare function removeSingleLineComments(content: string): string;
/**
 * Remove multi-line block comments from code
 */
export declare function removeMultiLineComments(content: string): string;
/**
 * Collapse multiple consecutive blank lines into a single blank line
 */
export declare function collapseBlankLines(content: string): string;
/**
 * Remove leading/trailing whitespace from each line while preserving indentation structure
 */
export declare function trimTrailingWhitespace(content: string): string;
/**
 * Summarize a block of code by showing first/last lines and a count
 */
export declare function summarizeBlock(lines: string[], maxPreview?: number): string;
/**
 * Extract the function or class containing specific line numbers
 */
export declare function extractContainingScope(content: string, changedLines: number[]): string;
/**
 * Preprocess a code snippet to reduce token count
 */
export declare function preprocessSnippet(snippet: FileSnippet, options?: Partial<PreprocessOptions>): FileSnippet;
/**
 * Preprocess multiple snippets
 */
export declare function preprocessSnippets(snippets: FileSnippet[], options?: Partial<PreprocessOptions>): FileSnippet[];
/**
 * Estimate token count for a string (rough approximation)
 * Uses ~4 characters per token as a heuristic
 */
export declare function estimateTokens(content: string): number;
/**
 * Calculate token savings from preprocessing
 */
export declare function calculateSavings(original: string, preprocessed: string): {
    originalTokens: number;
    newTokens: number;
    savedTokens: number;
    savingsPercent: number;
};
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