import { Frame, Environment } from '../index';
import { Executor } from './Executor';
export declare class ExpressionEvaluator {
    private frame;
    private globals;
    private executor;
    constructor(frame: Frame, globals: Environment, executor?: Executor | null);
    evaluate(expr: string): Promise<boolean>;
    /**
     * Replace all subexpressions $(...) in an expression string with their evaluated values
     */
    private replaceSubexpressions;
    /**
     * Extract a subexpression $(...) from a string, starting at the given position
     * Returns null if no valid subexpression is found
     */
    private extractSubexpressionFromString;
    private executeFunctionCall;
    private resolveVariable;
}