/**
 * CLI utilities — argument parsing, color parsing, and frame processing helpers.
 *
 * These helpers are intentionally framework-free so the CLI inherits the
 * zero-dependency posture of the library itself.
 */
import { RGBColor, ImageData } from '../types.js';
import { GifResult } from '../gif-result.js';
/** Error class for user-facing CLI failures (bad flags, missing input, etc). */
export declare class CliError extends Error {
    constructor(message: string);
}
/** Result of parsing CLI argv. */
export interface ParsedArgs {
    positional: string[];
    options: Map<string, string | boolean>;
}
export declare function parseArgs(argv: string[]): ParsedArgs;
export declare function getString(args: ParsedArgs, ...keys: string[]): string | undefined;
export declare function requireString(args: ParsedArgs, ...keys: string[]): string;
export declare function getNumber(args: ParsedArgs, ...keys: string[]): number | undefined;
export declare function requireNumber(args: ParsedArgs, ...keys: string[]): number;
export declare function getInt(args: ParsedArgs, ...keys: string[]): number | undefined;
export declare function requireInt(args: ParsedArgs, ...keys: string[]): number;
export declare function getBool(args: ParsedArgs, ...keys: string[]): boolean;
export declare function getChoice<T extends string>(args: ParsedArgs, keys: string[], choices: readonly T[]): T | undefined;
/**
 * Parses a color string. Accepts:
 *   - "r,g,b"   e.g. "255,0,0"
 *   - "#rrggbb" e.g. "#ff0000"
 *   - "#rgb"    e.g. "#f00"
 */
export declare function parseColor(input: string): RGBColor;
export declare function getColor(args: ParsedArgs, ...keys: string[]): RGBColor | undefined;
/** Parses "color1;color2;..." (semicolons because commas separate RGB). */
export declare function getColorList(args: ParsedArgs, ...keys: string[]): RGBColor[] | undefined;
/** Reads a file into a Uint8Array, surfacing a friendly error if it's missing. */
export declare function readGifFile(path: string): Promise<Uint8Array>;
/** Ensures the parent directory of `outputPath` exists before writing. */
export declare function ensureParentDir(outputPath: string): Promise<void>;
/**
 * Reads a GIF, applies a per-frame transform, and writes the result.
 *
 * For single-frame GIFs the output is a static GIF; for animated GIFs the
 * original delays and loop count are preserved.
 */
export declare function processGifFrames(inputPath: string, outputPath: string, transform: (frame: ImageData) => ImageData, options?: {
    maxColors?: number;
}): Promise<GifResult>;
/** Formats a byte count for human display ("1.5 KB"). */
export declare function formatBytes(bytes: number): string;