import * as monaco from 'monaco-editor';
/**
 * Validate an expr-lang expression and return Monaco editor markers.
 * Uses the recursive descent parser for syntax errors,
 * plus regex-based checks for structural issues like unbalanced quotes/brackets.
 */
export declare const validateExpr: (expr: string) => Omit<monaco.editor.IMarker, 'owner' | 'resource'>[];
/**
 * Validate an expr-lang expression and return a plain array of human-readable error messages.
 * Returns an empty array if the expression is valid.
 */
export declare function checkExpr(expr: string): string[];