import { FilterConstraint, FilterMap } from './search-params';
/**
 * A utility class for building filter maps
 */
export declare class FilterMapBuilder {
    private filterMap;
    /**
     * Adds a filter to the FilterMap under construction.
     * If existing constraint(s) already exist for this field and value, then the old and new constraints
     * will be joined into a single array.
     * @param field The field to filter on (e.g., 'subject', 'year', ...)
     * @param value The value of the field to filter on (e.g., 'Cicero', '1920', ...)
     * @param constraint The constraint to apply to the `field`, with respect to the given `value`.
     * Allowed values are the enum members of `FilterConstraint`.
     */
    addFilter(field: string, value: string, constraint: FilterConstraint): this;
    /**
     * Removes a single filter currently associated with the given field, value, and constraint type.
     * @param field The field to remove a filter for
     * @param value The value to remove the filter for
     * @param constraint The constraint type to remove for this field and value
     */
    removeSingleFilter(field: string, value: string, constraint: FilterConstraint): this;
    /**
     * Removes any filters currently associated with the given field and value.
     * @param field The field to remove a filter for
     * @param value The value to remove the filter for
     */
    removeFilters(field: string, value: string): this;
    /** If there are no remaining filters for this field, deletes the whole field object. */
    private deleteFieldIfEmpty;
    /**
     * Initializes the filter map under construction to have filters exactly equal to the given one.
     * This will overwrite *all* existing filters already added to the builder.
     * @param map The FilterMap to set this builder's state to.
     */
    setFilterMap(map: FilterMap): this;
    /**
     * Adds all filters from an existing filter map to the one being built.
     * Filters from the provided map may overwrite existing filters already added to the builder.
     * @param map The FilterMap to merge into the one being built.
     */
    mergeFilterMap(map: FilterMap): this;
    /**
     * Produces a `FilterMap` including all the filters that have been applied to
     * this builder.
     */
    build(): FilterMap;
}