export declare const defaultGrasslandsSeedSet: string[];
/**
 * Reads a seed prompt file, validates each line, and returns the validated array.
 * @param filePath - Path to the file.
 * @returns An array of prompts, or undefined if no path or empty file.
 * @throws If the file cannot be read, a line is invalid, or other errors occur.
 */
export declare function readSeedFile(filePath?: string): Promise<string[] | undefined>;