import { CellCollection } from '../CellCollection';
import { Grid } from '../Grid';
import { CellValueChange } from '../ValueTypes';
/**
 * Implements a class that deals with the case where only one cell in a row, column or block holds a value
 * but that cell also holds additional potential values. The solver will create changes that remove all the
 * other potentials from that cell.
 */
export declare class HiddenSinglesSolver {
    /**
     * The source of changes provided to callers.
     */
    static source: string;
    /**
     * Searches the grid for cells where the value only appears once in the row, column or block
     * and if it finds any, returns an array of changes to apply to the target grid.
     * @param targetGrid The grid to solve.
     * @returns An array of changes to apply to the grid to solve it.
     */
    static solve(targetGrid: Grid): CellValueChange[];
    /**
     * Searches a given Row, Column or Block for cells where its value doesn't appear
     * in any of the other cells implying that it should have that value.
     * TODO: does this code return changes with empty valuesToRemove?
     * @param block A reference to a row, column or block that holds 9 unique values.
     * @returns An array of changes that can be applied back to the grid.
     */
    static solveForBlock(block: CellCollection): CellValueChange[];
}