/**
 * Generate extended 256-color palette (indices 16-255) from base16 colors
 * using LAB color space interpolation. User-defined colors beyond index 15
 * in the scheme's colors array are preserved and not overwritten.
 *
 * @param colors - Array of hex color strings (at least 16; entries beyond 16 are user-defined extended colors)
 * @param bg - Background color as hex string
 * @param fg - Foreground color as hex string
 * @param harmonious - If true, disable light-theme inversion
 * @returns Array of 240 hex color strings for indices 16-255
 */
export declare function generatePalette(colors: string[], bg: string, fg: string, harmonious: boolean): string[];
