/**
 * Read specific lines from a source file.
 * @param filePath Path to the source file
 * @param start Start line (1-based, inclusive)
 * @param end End line (1-based, inclusive)
 * @returns Array of source lines, or ['<source code not available>'] on error
 */
export declare function readSourceLines(filePath: string, start: number, end: number): Promise<string[]>;
/**
 * Read specific lines from a source file as a single string.
 * @param filePath Path to the source file
 * @param start Start line (1-based, inclusive)
 * @param end End line (1-based, inclusive)
 * @returns Source code string, or '<source code not available>' on error
 */
export declare function readSourceAsString(filePath: string, start: number, end: number): Promise<string>;
/**
 * Read all lines from a source file.
 * @param filePath Path to the source file
 * @returns Array of all source lines, or empty array on error
 */
export declare function readAllLines(filePath: string): Promise<string[]>;
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