/**
 * @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.
 */
/**
 * Default options for ranking colors based on usage counts.
 * desired: is the max count of the colors returned.
 * fallbackColorARGB: Is the default color that should be used if no
 *                    other colors are suitable.
 * filter: controls if the resulting colors should be filtered to not include
 *         hues that are not used often enough, and colors that are effectively
 *         grayscale.
 */
declare interface ScoreOptions {
    desired?: number;
    fallbackColorARGB?: number;
    filter?: boolean;
}
/**
 *  Given a large set of colors, remove colors that are unsuitable for a UI
 *  theme, and rank the rest based on suitability.
 *
 *  Enables use of a high cluster count for image quantization, thus ensuring
 *  colors aren't muddied, while curating the high cluster count to a much
 *  smaller number of appropriate choices.
 */
export declare class Score {
    private static readonly TARGET_CHROMA;
    private static readonly WEIGHT_PROPORTION;
    private static readonly WEIGHT_CHROMA_ABOVE;
    private static readonly WEIGHT_CHROMA_BELOW;
    private static readonly CUTOFF_CHROMA;
    private static readonly CUTOFF_EXCITED_PROPORTION;
    private constructor();
    /**
     * Given a map with keys of colors and values of how often the color appears,
     * rank the colors based on suitability for being used for a UI theme.
     *
     * @param colorsToPopulation map with keys of colors and values of how often
     *     the color appears, usually from a source image.
     * @param {ScoreOptions} options optional parameters.
     * @return Colors sorted by suitability for a UI theme. The most suitable
     *     color is the first item, the least suitable is the last. There will
     *     always be at least one color returned. If all the input colors
     *     were not suitable for a theme, a default fallback color will be
     *     provided, Google Blue.
     */
    static score(colorsToPopulation: Map<number, number>, options?: ScoreOptions): number[];
}
export {};