/**
 * The runtime argument, policy, or a script could not decide the line.
 * Caller-fixable routing mistakes (unknown runtime name, a script that does not parse, a
 * missing monty package) propagate loud instead of folding into the
 * line's IOResult like a command failure.
 */
export declare class RouteError extends Error {
    constructor(message: string, options?: {
        cause?: unknown;
    });
}
/**
 * The policy refused the line before anything ran.
 *
 * A legitimate policy outcome, not a mistake: execute() folds it into
 * the line's result (exit 126, the reason on stderr) instead of
 * propagating like RouteError.
 */
export declare class RouteDeny extends Error {
    readonly reason: string;
    constructor(reason: string);
}
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