import { OnDestroy } from '@angular/core';
import { Subject } from 'rxjs';
import { GameGrid } from '../definitions';
import * as i0 from "@angular/core";
export declare class GameManagerService implements OnDestroy {
    private _grid;
    private _grid$;
    grid$: import("rxjs").Observable<GameGrid>;
    private _gameOver$;
    gameOver$: Subject<unknown>;
    private _foodEaten$;
    foodEaten$: Subject<unknown>;
    private _gridSize;
    private _snake;
    private _nextMoveDir;
    private _moveDir;
    private _food;
    private _interval$;
    private _paused;
    private _playable;
    private _signalSub;
    signal$: import("rxjs").Observable<number>;
    initialize(height: number, width: number): void;
    ngOnDestroy(): void;
    start(): void;
    changeSpeed(period: number): void;
    pause(): void;
    reset(): void;
    up(): void;
    right(): void;
    down(): void;
    left(): void;
    private _endGame;
    private _buildEmptyGrid;
    private _gridChanged;
    private _initSnake;
    private _spawnFood;
    private _drawSnake;
    private _gameCycle;
    /**
     * Checks if field is not currently occupied (is free to take)
     * @param newHead
     * @private
     */
    private _willCrash;
    private _willGrow;
    private _increaseSpeed;
    static ɵfac: i0.ɵɵFactoryDeclaration<GameManagerService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<GameManagerService>;
}