/**
 * Machine-readable error codes. Branch on `error.code` rather than parsing
 * messages — useful for programmatic recovery (including by LLM agents).
 */
export type ErrorCode = 'BQL' | 'CONNECTION' | 'TIMEOUT';
/** Raised when the BrowserQL server returns GraphQL errors. */
export declare class BrowserQLError extends Error {
    readonly code: ErrorCode;
    readonly errors: Array<{
        message: string;
    }>;
    constructor(errors: Array<{
        message: string;
    }>);
}
/** Raised when the WebSocket connection fails, drops, or is unavailable. */
export declare class ConnectionError extends Error {
    readonly code: ErrorCode;
    constructor(message: string);
}
/** Raised when an operation exceeds its timeout. */
export declare class TimeoutError extends Error {
    readonly code: ErrorCode;
    /** The operation that timed out (truncated GraphQL query), when known. */
    readonly operation?: string;
    /** The timeout that was exceeded, in milliseconds, when known. */
    readonly timeoutMs?: number;
    constructor(message: string, context?: {
        operation?: string;
        timeoutMs?: number;
    });
}
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