/**
 * The copy expression allows the copy SOP node to evaluates its input graph multiple times, and vary its result each time.
 *
 * @remarks
 * It takes 2 or 3 arguments
 *
 * copy(<input_index_or_node_path\>, <default_value/>, <attribute_name/>)
 *
 * - **<input_index_or_node_path\>** is a number or a string
 * - **<default_value\>** is a number
 * - **<attribute_name\>** is the attribute that will be stamped
 *
 * ## Usage
 *
 * - `copy('../copy1', 0, 'i')` - returns the index of each evaluation
 *
 */
import { BaseMethod } from './_Base';
import { MethodDependency } from '../MethodDependency';
export declare class CopyExpression extends BaseMethod {
    protected _require_dependency: boolean;
    static required_arguments(): string[][];
    static optional_arguments(): string[][];
    find_dependency(index_or_path: number | string): MethodDependency | null;
    process_arguments(args: any[]): Promise<any>;
}