import type { AsciiArtColorDepth } from './convertImageDataToAsciiArt';
/**
 * Detects the ANSI color depth supported by the current terminal.
 *
 * Prefers 24-bit true color when the environment advertises it (modern terminals such as
 * Windows Terminal, ConEmu, VS Code, mintty, iTerm2, and WezTerm) and falls back to the
 * portable 256-color palette otherwise.
 *
 * Note: `$` is used to indicate that this function is not a pure function - it reads the process environment
 *
 * @returns Color depth usable by `convertImageDataToAsciiArt`
 *
 * @private within the repository
 */
export declare function $detectTerminalAnsiColorDepth(): AsciiArtColorDepth;