function fgBg256 fgBg256(fg: number,bg?: number,): string Generates ANSI escape codes for setting both the text (foreground) and background colors using 8-bit color codes. Parameters fg: number The 8-bit color code for the foreground (0-255). optional bg: number The 8-bit color code for the background (0-255). Return Type string The ANSI escape code string for setting both the text and background colors.