import { WCAG2Param } from "../typings/WCAG2Param";
import { Color } from "./Color";
import { ColorBuilder } from "../services/ColorBuilder";
export interface MostReadableOption extends WCAG2Param {
    fallbackColors: boolean;
}
export declare class WCAG2 {
    private readonly builder;
    private base;
    constructor(builder: ColorBuilder);
    build(fn: (builder: ColorBuilder) => Color): this;
    new(c: Color): this;
    /**
     * Analyze the 2 colors and returns the color contrast defined by (WCAG Version 2)
     *
     * @param color second color
     *
     * @return readability number for foreground or background color
     */
    readability(color: Color): number;
    isReadable(color: Color, wcag2?: Partial<WCAG2Param>): boolean;
    mostReadable(colors: Color[], opts?: Partial<MostReadableOption>): Color | undefined;
    /**
     * return valid WCAG2 parms for isReadable.
     * If input parms are invalid, return {"level":"AA", "size":"small"}
     *
     * @param parms input wcag2 param object
     */
    private validateWCAG2Parms;
}
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