/**
 * Color depth of the ANSI escape codes emitted by the ASCII-art conversion.
 *
 * - `TRUE_COLOR` emits 24-bit `38;2;r;g;b` / `48;2;r;g;b` sequences
 * - `ANSI_256` approximates colors on the 256-color ANSI cube for older terminals
 *
 * @private within the repository
 */
export type AsciiArtColorDepth = 'TRUE_COLOR' | 'ANSI_256';
/**
 * Minimal structural subset of the DOM `ImageData` accepted by the ASCII-art conversion.
 *
 * Works with browser canvas `ImageData`, `@napi-rs/canvas` image data, or any raw RGBA buffer.
 *
 * @private within the repository
 */
export type AsciiArtImageData = {
    /**
     * Source image width in pixels.
     */
    readonly width: number;
    /**
     * Source image height in pixels.
     */
    readonly height: number;
    /**
     * Flat RGBA pixel buffer with 4 bytes per pixel.
     */
    readonly data: ArrayLike<number>;
};
/**
 * Options for `convertImageDataToAsciiArt`.
 *
 * @private within the repository
 */
export type ConvertImageDataToAsciiArtOptions = {
    /**
     * Source pixels to convert.
     */
    readonly imageData: AsciiArtImageData;
    /**
     * Output width in terminal character cells.
     */
    readonly columns: number;
    /**
     * Output height in terminal character cells.
     *
     * Each character cell renders two vertically stacked pixels, so `rows = columns / 2`
     * keeps a square image visually square in a common terminal font.
     */
    readonly rows: number;
    /**
     * Color depth of the emitted ANSI escape codes.
     *
     * @default 'TRUE_COLOR'
     */
    readonly colorDepth?: AsciiArtColorDepth;
    /**
     * Alpha channel value (0-255) below which an averaged half-cell is treated as fully transparent.
     *
     * @default 32
     */
    readonly alphaThreshold?: number;
};
/**
 * Converts raw RGBA image pixels into colored ASCII art for ANSI terminals.
 *
 * This is the universal image-to-terminal technique used across the repository:
 * every output character cell covers a rectangular region of source pixels which is
 * split into a top and bottom half; each half is area-averaged and rendered with
 * half-block characters (`▀` / `▄`) so one character shows two "pixels" vertically.
 * Transparent halves keep the terminal background so non-rectangular images
 * (for example rounded avatar cards) compose naturally into any terminal UI.
 *
 * @param options Source pixels, output grid size, and ANSI color depth.
 * @returns One ANSI-colored string per output row, each ending with a color reset.
 *
 * @private within the repository
 */
export declare function convertImageDataToAsciiArt(options: ConvertImageDataToAsciiArtOptions): ReadonlyArray<string>;