/**
 * Library-wide Constants
 *
 * Centralizes magic numbers and default configuration values
 * used across FlowDrop services.
 *
 * @module config/constants
 */
/** Default API request timeout in milliseconds */
export declare const DEFAULT_API_TIMEOUT_MS = 30000;
/** Cache timeout for node execution data in milliseconds */
export declare const NODE_EXECUTION_CACHE_TIMEOUT_MS = 30000;
/** Duration to mark pipeline API as unavailable after 404 (milliseconds) */
export declare const PIPELINE_API_UNAVAILABLE_DURATION_MS: number;
/** Default cache TTL for schema and variable data in milliseconds (5 minutes) */
export declare const DEFAULT_CACHE_TTL_MS: number;
/**
 * Custom arrowhead dimensions (in pixels) drawn by FlowDropEdge.
 * The edge path is shortened by ARROW_LENGTH_PX so the stroke ends
 * at the arrow base, and the arrowhead polygon is rendered separately
 * at the target handle position.
 */
export declare const ARROW_LENGTH_PX = 8;
export declare const ARROW_HALF_WIDTH_PX = 4;
/** Edge marker arrow sizes by category */
export declare const EDGE_MARKER_SIZES: {
    readonly loopback: {
        readonly width: 14;
        readonly height: 14;
    };
    readonly trigger: {
        readonly width: 16;
        readonly height: 16;
    };
    readonly tool: {
        readonly width: 16;
        readonly height: 16;
    };
    readonly data: {
        readonly width: 16;
        readonly height: 16;
    };
};
/** Toast notification durations in milliseconds */
export declare const TOAST_DURATION: {
    readonly SUCCESS: 4000;
    readonly ERROR: 6000;
    readonly WARNING: 5000;
    readonly INFO: 4000;
    readonly CONFIRMATION: 5000;
};