/**
 * HostEngine — Formula evaluation error, localized via i18n.
 *
 * `message` is ALWAYS the localized, user-facing string. `cause` retains
 * the original (English, code-prefixed) error thrown by the formula
 * implementation itself, for logs/devtools — never shown to the end user.
 */
export declare class FormulaEngineError extends Error {
    readonly formulaName: string | undefined;
    readonly cause?: Error | undefined;
    constructor(localizedMessage: string, formulaName: string | undefined, cause?: Error | undefined);
}