import { CssColor } from './CssNamedColorsType';
/**
 * Analyses the color (normally used in the background) and retrieves what color (black or white) has a better contrast.
 * @param cssColor The CSS named color string. The list of colors is defined as a TypeScript type to help the usage.
 * @param threshold Contrast threshold to control the resulting font color, float values from 0 to 1. Default is 0.5.
 * @example fontColorContrast('beige')
 * @example fontColorContrast('darkcyan', 0.3)
 */
declare function fontColorContrast(cssColor: CssColor, threshold?: number): '#ffffff' | '#000000';
/**
 * Analyses the color (normally used in the background) and retrieves what color (black or white) has a better contrast.
 * @param hex The hex color string must be a valid hexadecimal color number to work correctly. Works with or without '#', with 3 or 6 color chars. Any other length or an invalid hex character will be ignored. A space is allowed between the hash symbol and the number.
 * @param threshold Contrast threshold to control the resulting font color, float values from 0 to 1. Default is 0.5.
 * @example fontColorContrast('00FFDD') === fontColorContrast('0FD') === fontColorContrast('#00FFDD') === fontColorContrast('#0FD') === fontColorContrast('# 00FFDD') === fontColorContrast('# 0FD')
 */
declare function fontColorContrast(hex: string, threshold?: number): '#ffffff' | '#000000';
/**
 * Analyses the color (normally used in the background) and retrieves what color (black or white) has a better contrast.
 * @param hex The hex color number must be an integer between 0 and 0xffffff (16777215).
 * @param threshold Contrast threshold to control the resulting font color, float values from 0 to 1. Default is 0.5.
 * @example fontColorContrast(0XF3DC56) === fontColorContrast(15981654)
 */
declare function fontColorContrast(hex: number, threshold?: number): '#ffffff' | '#000000';
/**
 * Analyses the color (normally used in the background) and retrieves what color (black or white) has a better contrast.
 * @param red The red portion of the color. Must be an integer between 0 and 255.
 * @param green The green portion of the color. Must be an integer between 0 and 255.
 * @param blue The blue portion of the color. Must be an integer between 0 and 255.
 * @param threshold Contrast threshold to control the resulting font color, float values from 0 to 1. Default is 0.5.
 * @example fontColorContrast(0, 243, 216) === fontColorContrast(0x0, 0xF3, 0xd8).
 */
declare function fontColorContrast(red: number, green: number, blue: number, threshold?: number): '#ffffff' | '#000000';
/**
 * Analyses the color (normally used in the background) and retrieves what color (black or white) has a better contrast.
 * @param rgbArray Array with red, green and blue. Each value must be an integer between 0 and 255.
 * @param threshold Contrast threshold to control the resulting font color, float values from 0 to 1. Default is 0.5.
 * @example fontColorContrast(fontColorContrast([0, 243, 216]) === fontColorContrast([0x0, 0xF3, 0xd8])
 */
declare function fontColorContrast(rgbArray: number[], threshold?: number): '#ffffff' | '#000000';
export default fontColorContrast;
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