import { DataBase, DataTableList } from '../../data';
import { ChartContext, DataType, LayerScale, LayerStyle } from '../../types';
/**
 * Integrate scales from different sources into the final scale.
 * @param defaultScale
 * Default scale means "new scale", has medium priority.
 * @param currentScale
 * Current scale means "old scale", has lowest priority.
 * @param incomingScale
 * Incoming scale means "new scale", has highest priority.
 * @returns
 * The final merged scale.
 */
export declare function createScale<Scale extends Maybe<LayerScale>>(defaultScale: Scale, currentScale: Scale, incomingScale?: Scale): Scale & {
    nice: Partial<{
        count: number;
        zero: boolean;
        fixedStep: number;
        fixedStart: number;
    }> & Partial<{
        paddingInner: number;
        fixedPaddingInner: number;
        fixedBandwidth: number;
        fixedBoundary: "start" | "end";
    }> & Partial<{
        paddingInner: number;
    }>;
};
/**
 * Check if the data type meets the layer requirements.
 * @param dataType
 * Only subclasses that inherit from the `DataBase` class are valid data sources.
 * @param currentData
 * Current data means "old data", has lowest priority.
 * @param incomingData
 * Incoming data means "new data", has highest priority.
 * @param filter
 * Just a callback method.
 * @returns
 */
export declare function createData<Data extends Maybe<DataBase<unknown>>>(dataType: DataType, currentData: Data, incomingData: Data, filter?: (data: Data) => Data | void): Data;
/**
 * Integrate styles from different sources into the final style.
 * @param context
 * Theme from chart context will be used to generate style.
 * @param defaultStyle
 * Default style means "new style", has medium priority.
 * @param currentStyle
 * Current style means "old style", has lowest priority.
 * @param incomingStyle
 * Incoming style means "new style", has highest priority.
 * @returns
 * The final merged style.
 */
export declare function createStyle<Style extends Maybe<AnyObject>>(context: ChartContext, defaultStyle: Style, currentStyle: Style, incomingStyle: LayerStyle<Style>): Style;
/**
 * Check if TableList has a specific columns.
 * @param data
 * The `TableList` to check.
 * @param keys
 * The headers that the tableList must have.
 * @throw
 * Throw `Error` when tableList lack of specific header.
 */
export declare function checkColumns(data: Maybe<DataTableList>, keys: Meta[]): void;
/**
 * Generates the class name of the base element.
 * @param sublayer
 * The sublayer tags that the elements have.
 * @returns
 * Selectable `className` for basic element.
 */
export declare function elClass(sublayer: string): string;