import { Grid } from './Grid';
import { CellValueChange } from './ValueTypes';
/**
 * An enumeration of available solving strategies. Note that backtracking
 * is handled separately in the options.
 */
export declare enum SudokuSolverStrategy {
    NakedSingles = 0,
    HiddenSingles = 1,
    NakedPairs = 2,
    HiddenPairs = 3,
    NakedTriples = 4,
    HiddenTriples = 5,
    NakedQuads = 6,
    HiddenQuads = 7,
    PointingPairs = 8,
    IntersectionRemoval = 9
}
/**
 * Defines the available options for solving the puzzle.
 */
export declare class SudokuSolverOptions {
    /**
     * An optional array of SudokuSolverStrategy values representing the solvers to include.
     * If an array isn't provided, it will include all solvers by default. To run
     * the backtracking algorithm on its own, specify an empty array i.e. [].
     */
    includeStrategies?: SudokuSolverStrategy[];
    /**
     * An optional value whether to complete puzzles using backtracking. If the value is
     * not specified or set to true, backtracking will be used to fill in any unknown
     * cells. If it is explicitly set to false, it will not run backtracking. Note that
     * this might result in outputting incomlpete puzzles but it's useful when writing new
     * solver classes.
     */
    includeBacktracking?: boolean;
    /**
     * An optional callback function that allows you to see each individual set of changes as the
     * grid is solved.
     */
    stepCallback?: (changes: CellValueChange[], resultingGrid: Grid) => void;
}
/**
 * Fills in any missing default values not provided by the calling application.
 * @param providedOptions Options provided by the calling application.
 * @returns Options with defaults filled in where unspecified.
 */
export declare function deriveOptions(providedOptions: SudokuSolverOptions): SudokuSolverOptions;