import { SymbolMergeHandler } from '../events/onSymbolMerge.js';
import GridData from '../grid.js';
import { State } from '../primitives.js';
import Symbol from './symbol.js';
export default abstract class CustomSymbol extends Symbol implements SymbolMergeHandler {
    readonly description: string;
    readonly grid: GridData;
    /**
     * **A custom symbol**
     *
     * @param description - The description of the symbol. Leave this empty to hide the description.
     * @param grid - The thumbnail grid of the rule, preferably 5x4 in size.
     * @param x - The x-coordinate of the symbol.
     * @param y - The y-coordinate of the symbol.
     */
    constructor(description: string, grid: GridData, x: number, y: number);
    get explanation(): string;
    createExampleGrid(): GridData;
    validateSymbol(_grid: GridData): State;
    get validateWithSolution(): boolean;
    descriptionEquals(other: Symbol): boolean;
    withDescription(description: string): this;
    withGrid(grid: GridData): this;
}
export declare const instance: undefined;