import { DataType } from 'apache-arrow';
import { CosmographConfig } from "..";
import { ColorAccessorFn } from "../config/interfaces/data";
export declare enum LinkColorStrategy {
    /**
     * Uses the sum of numeric values between the same source and target points in {@link CosmographConfig.linkColorBy linkColorBy} to determine link colors and interpolates them from {@link CosmographConfig.linkColorPalette linkColorPalette}.
     * - Uses {@link CosmographConfig.unknownColor unknownColor} for nullish values
     * - Has effect only if {@link CosmographConfig.linkColorBy linkColorBy} provided and contains numeric data.
     */
    Sum = "sum",
    /**
     * Uses the average of numeric values between the same source and target points in {@link CosmographConfig.linkColorBy linkColorBy} to determine link colors and interpolates them from {@link CosmographConfig.linkColorPalette linkColorPalette}.
     * - Uses {@link CosmographConfig.unknownColor unknownColor} for nullish values
     * - Has effect only if {@link CosmographConfig.linkColorBy linkColorBy} provided and contains numeric data.
     */
    Average = "average",
    /**
     * Uses the count of links between the same source and target points in {@link CosmographConfig.linkColorBy linkColorBy} to determine link colors and interpolates them from {@link CosmographConfig.linkColorPalette linkColorPalette}.
     */
    Count = "count",
    /**
     * Uses colors from {@link CosmographConfig.linkColorPalette linkColorPalette} for {@link CosmographConfig.linkColorBy linkColorBy} data without interpolation.
     * - For numeric data: Creates equal-width buckets mapped to {@link CosmographConfig.linkColorPalette linkColorPalette} colors
     * - For categorical data: Assigns colors from {@link CosmographConfig.linkColorPalette linkColorPalette} in order, cycling when unique values exceed palette length
     * - Uses {@link CosmographConfig.unknownColor unknownColor} for nullish values
     * - Has effect only if {@link CosmographConfig.linkColorBy linkColorBy} provided
     */
    Categorical = "categorical",
    /**
     * Directly uses {@link CosmographConfig.linkColorBy linkColorBy} column values as colors.
     * - Applies the color if it's a valid color string (hex, rgb, named color, etc) or an array of `[r, g, b, a]`
     * - If {@link CosmographConfig.linkColorByFn linkColorByFn} exists, applies it to transform {@link CosmographConfig.linkColorBy linkColorBy} values into custom colors with it
     * - Falls back to {@link CosmographConfig.unknownColor unknownColor} if invalid color
     * - If neither {@link CosmographConfig.linkColorBy} nor {@link CosmographConfig.linkColorByFn} exist, colors all links with {@link CosmographConfig.unknownColor unknownColor}
     */
    Direct = "direct",
    /**
     * Colors all links uniformly to the same color specified by {@link CosmographConfig.linkDefaultColor linkDefaultColor}.
     */
    Single = "single"
}
export type LinkColorStrategyType = `${LinkColorStrategy}`;
/**
 * Determines the optimal color strategy for points based on the input configuration and color data type.
 *
 * @param config - The configuration object of the Cosmograph.
 * @param pointsSummary - Optional summaries of points.
 * @returns The resolved {@link PointColorStrategyType}
 */
export declare function resolveOptimalLinkColorStrategy(config?: CosmographConfig, dataColumnType?: DataType): LinkColorStrategyType;
/**
 * Determines the appropriate color accessor function based on the provided configuration and data.
 *
 * @param config - The configuration object of the Cosmograph.
 * @param data - The data array to be used for color scaling.
 * @param dataColumnType - The data type of the column being colored (optional).
 * @returns A color accessor function that can be used to determine the color of points.
 */
export declare const getActiveLinkColorFn: (strategy: LinkColorStrategyType, config: CosmographConfig, data: string[] | number[], dataColumnType?: DataType) => ColorAccessorFn;