/**
 * CTRF Runtime API for Mocha
 *
 * The reporter sets a global runtime interface that forwards metadata to the reporter.
 *
 * ## Usage
 *
 * ```ts
 * import { extra } from 'mocha-ctrf-json-reporter/runtime'
 *
 * it('should do something', () => {
 *   extra({ priority: 'high', owner: 'team-a' })
 *   // test code...
 * })
 * ```
 */
export declare const CTRF_MOCHA_RUNTIME_KEY = "__ctrfMochaRuntime__";
export type MessageProcessor = (message: RuntimeMessage) => void;
export interface RuntimeMessage {
    type: 'extra';
    data: Record<string, any>;
}
/**
 * MochaTestRuntime interface for type exports
 */
export interface MochaTestRuntime {
    extra(data: Record<string, any>): void;
}
/**
 * Set the global runtime (called by reporter)
 */
export declare function setGlobalTestRuntime(runtime: MochaTestRuntime): void;
/**
 * Create a runtime instance with a message processor
 */
export declare function createTestRuntime(messageProcessor: MessageProcessor): MochaTestRuntime;
/**
 * Add extra data to the current test's CTRF output.
 * Call this from within test code to attach custom metadata.
 *
 * @example
 * ```ts
 * import { extra } from 'mocha-ctrf-json-reporter/runtime'
 *
 * it('should do something', () => {
 *   extra({ priority: 'high', owner: 'team-a' })
 *   // test code...
 * })
 * ```
 *
 * Multiple calls are deep-merged:
 * - Arrays are concatenated
 * - Nested objects are recursively merged
 * - Primitives are overwritten by later calls
 */
export declare function extra(data: Record<string, any>): void;
/** CTRF runtime API namespace */
export declare const ctrf: {
    readonly extra: typeof extra;
};