export declare class GridMatrix {
    protected width: number;
    protected matrix: Array<Array<boolean>>;
    protected lastUsedCoordinates: {
        x: number;
        y: number;
    };
    protected currentRow: number;
    protected newRowTemplate: Array<boolean>;
    constructor(width: number);
    protected addNextRow(): void;
    /**
     * Finds the first N cells within the row that are not taken, and
     * returns the index of the first of those cells, if theres is no N
     * free cells in the row, returns null.
     */
    protected getFirstNFreeCellsInRow(y: number, n: number, onlyAfterIndex?: number): number | null;
    protected markCellsAsUsed(x: number, y: number, colSpan: number, rowSpan: number): void;
    protected findNextAvailableCellForElement(colSpan: number): {
        x: number;
        y: number;
    };
    nextElement(colSpan: number, rowSpan: number): {
        x: number;
        y: number;
    };
}