import type { BuiltinFn } from './builtins.js';
import type { ExpressionEngine, ExpressionEvaluationOptions, ExpressionScope, ParseResult } from './types.js';
export interface EchelonExpressionEngineOptions {
    /** Default timeout stosowany gdy options.timeoutMs nie zostanie podany. Default 50ms. */
    readonly defaultTimeoutMs?: number;
    /** Dodatkowe funkcje spoza BUILTINS (pure, deterministic). */
    readonly functions?: Readonly<Record<string, BuiltinFn>>;
    /** Rozmiar cache AST. Default 256. */
    readonly cacheSize?: number;
}
export declare class EchelonExpressionEngine implements ExpressionEngine {
    private readonly defaultTimeoutMs;
    private readonly functions?;
    private readonly cache;
    private readonly cacheSize;
    constructor(options?: EchelonExpressionEngineOptions);
    parse(expr: string): ParseResult;
    evaluate(expr: string, scope: ExpressionScope, options?: ExpressionEvaluationOptions): unknown;
    references(expr: string): readonly string[];
    private getAst;
}
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