/**
 * Checks if the system prefers dark mode.
 * Falls back safely if matchMedia is not supported.
 * @returns True if system is in dark mode.
 */
export declare const systemIsInDarkMode: () => boolean;
/**
 * Checks if on Safari.
 * @returns True if on Safari.
 */
export declare const isSafari: () => boolean;
/**
 * Checks if on Firefox.
 * @returns True if on Firefox.
 */
export declare const isFirefox: () => boolean;
/**
 * Returns a valid index within the given maximum index.
 * Out of bound index loops back to the first valid index.
 * @param index - The index to validate.
 * @param maxIndex - The maximum index. If not provided or 0, returns 0.
 * @returns The valid index.
 */
export declare const getValidIndex: (index: number, maxIndex?: number) => number;
/**
 * Returns a value bounded between a minimum and maximum limit.
 * @returns The bounded value.
 */
export declare const minMax: (value: number, minLimit: number, maxLimit: number) => number;
/**
 * Transforms a hex string into rgba values.
 * @param hex - A hex color, starting with '#' and including 3 (=shorthand), 6 (=default) or 8 (=including alpha) values.
 * @returns an array of rgba values: R, G, B [0-255], alpha [0-1]. Or null if the hex color is invalid.
 */
export declare const hexToRgbaArray: (hex: string) => [number, number, number, number] | null;
/**
 * Transforms a rgb string into rgba values.
 * @param rgbaStr - A rgb or rgba color, starting with 'rgb' and including 3 or 4 (=including alpha) values.
 * @returns an array of rgba values: R, G, B [0-255] and alpha [0-1]. Or null if the rgb string is invalid.
 */
export declare const rgbStrToRgbaArray: (rgbaStr: string) => [number, number, number, number] | null;
/**
 * Transform a color string to an array of rgba values.
 * @param color A string representing a color. Can be of type hex ('#0033ff') or rgb(a) ('rgba(255, 23, 15, 0.5)').
 * @returns an array of rgba values: R, G, B [0-255] and alpha [0-1]. Or null if the color isn't in a valid format.
 */
export declare const colorToRgbaArray: (color: string) => [number, number, number, number] | null;