/**
 * @license
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Hct } from '../hct/hct.js';
/**
 *  A convenience class for retrieving colors that are constant in hue and
 *  chroma, but vary in tone.
 */
export declare class TonalPalette {
    readonly hue: number;
    readonly chroma: number;
    readonly keyColor: Hct;
    private readonly cache;
    /**
     * @param argb ARGB representation of a color
     * @return Tones matching that color's hue and chroma.
     */
    static fromInt(argb: number): TonalPalette;
    /**
     * @param hct Hct
     * @return Tones matching that color's hue and chroma.
     */
    static fromHct(hct: Hct): TonalPalette;
    /**
     * @param hue HCT hue
     * @param chroma HCT chroma
     * @return Tones matching hue and chroma.
     */
    static fromHueAndChroma(hue: number, chroma: number): TonalPalette;
    private constructor();
    /**
     * @param tone HCT tone, measured from 0 to 100.
     * @return ARGB representation of a color with that tone.
     */
    tone(tone: number): number;
    /**
     * @param tone HCT tone.
     * @return HCT representation of a color with that tone.
     */
    getHct(tone: number): Hct;
    private averageArgb;
}