import { CellGrid } from './CellGrid.js';
import { Color } from './Color.js';
import { Grid } from './Grid.js';
import { Size } from './Size.js';
export declare class FracGrid extends Grid<number> {
    constructor(size: Size);
    overlay(cell_grid: CellGrid, frac: number): void;
    color_for_value(val: number): Color;
}