/**
 * Color depth detection and SGR emission.
 *
 * Covers cavekit-terminal-blend R7: emit truecolor when the terminal supports it,
 * 256-color when it doesn't, and 16-color as a last resort so sequences degrade
 * cleanly under tmux, screen, and linux-console.
 */
export type ColorDepth = "truecolor" | "256" | "16";
export declare function detectColorDepth(env?: NodeJS.ProcessEnv): ColorDepth;
export declare function resetColorDepthCache(): void;
/**
 * Emit the SGR escape sequence to set the given color as foreground or background
 * at the given color depth. Returns "" for invalid input (empty/undefined hex).
 */
export declare function hexToSgr(hex: string | undefined | null, depth: ColorDepth, kind: "fg" | "bg"): string;
export declare function sgrReset(): string;
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