/**
 * Event System Constants
 * Centralized constants for event emitter, handlers, and system-level configurations.
 */
export declare const DEFAULT_PAYEMNT_PRIORITY = 1;
export declare const DEFAULT_URGENT = 0;
export declare const DEFAULT_MAX_LISTENERS = 10;
export declare const DEFAULT_HANDLER_TIMEOUT_MS = 10000;
export declare const DEFAULT_EVENT_COUNT = 0;
export declare const DEFAULT_SUCCESS_THRESHOLD = 1;
export declare const DEFAULT_PARTIAL_SUCCESS_THRESHOLD = 0.9;
export declare const EVENT_DEFAULTS: {
    PRIORITY: number;
    URGENT: number;
    MAX_LISTENERS: number;
    HANDLER_TIMEOUT_MS: number;
    SUCCESS_THRESHOLD: number;
    PARTIAL_SUCCESS_THRESHOLD: number;
    EVENT_COUNT: number;
};
export declare const EVENT_COMPONENT: {
    readonly EMITTER: "event-emitter";
    readonly PAYMENT_GATEWAY: "payment-gateway";
    readonly SUBSCRIPTION_MANAGER: "subscription-manager";
    readonly PROVIDER_ADAPTER: "provider-adapter";
};
export declare const EVENT_ERROR_CODE: {
    readonly HANDLER_FAILED: "HANDLER_FAILED";
    readonly HANDLER_CRASHED: "HANDLER_CRASHED";
    readonly HANDLER_TIMEOUT: "HANDLER_TIMEOUT";
};
export declare const EVENT_ERROR_MESSAGE: {
    HANDLER_FAILED: string;
    HANDLER_TIMEOUT: string;
};
export declare const EVENT_ENVIRONMENT: {
    readonly DEVELOPMENT: "development";
    readonly PRODUCTION: "production";
    readonly TEST: "test";
};
export declare const PHASE_NONE = 0;
export declare const PHASE_CAPTURING = 1;
export declare const PHASE_AT_TARGET = 2;
export declare const PHASE_BUBBLING = 3;
export declare const EVENT_PHASE: {
    readonly NONE: 0;
    readonly CAPTURING_PHASE: 1;
    readonly AT_TARGET: 2;
    readonly BUBBLING_PHASE: 3;
};
export declare const EVENT_META_KEY: {
    readonly PRIORITY: "priority";
    readonly URGENT: "urgent";
    readonly CATEGORY: "category";
    readonly TAGS: "tags";
    readonly SOURCE: "source";
};
export declare const EVENT_SOURCE_FIELD: {
    readonly COMPONENT: "component";
    readonly ENVIRONMENT: "environment";
};
export declare const EVENT_RESULT_STATUS: {
    readonly ERROR: "error";
    readonly INFO: "info";
    readonly WARNING: "warning";
    readonly CRITICAL: "critical";
};
export declare const EmptyArray: <T = unknown>() => T[];
export declare const CurrentTimestamp: () => number;
/**
 * Enum representing the state of a Promise.
 */
export declare const SETTLED_PROMISE_STATUS: {
    readonly FULFILLED: "fulfilled";
    readonly REJECTED: "rejected";
};
export declare const EVENT_NORMALIZER_MESSAGES: {
    readonly NORMALIZATION_FAILED: "Event normalization failed.";
    readonly MAPPING_MISSING: "No mapping configuration found for provider.";
    readonly MAPPING_RETRIEVE_FAILED: "Failed to retrieve provider mapping.";
    readonly BUILD_NORMALIZED_DATA_FAILED: "Failed to build normalized payment data.";
    readonly BUILD_UNIFIED_EVENT_FAILED: "Failed to build unified event.";
    readonly EVENT_TYPE_MAPPING_FAILED: "Event type mapping failed.";
    readonly STATUS_MAPPING_FAILED: "Status mapping failed.";
    readonly PAYLOAD_EXTRACTION_FAILED: "Payload extraction failed.";
    readonly requiredFileMissing: (field: string) => string;
};
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