/**
 * Progress event helpers for long-running operations.
 *
 * Provides a standard interface for reporting progress from workers and
 * async operations. Uses CustomEvent for cross-context communication.
 *
 * @module
 */
export type ProgressLevel = "info" | "warn" | "error";
/**
 * Progress payload containing a message and timestamp.
 * Planned expansion to include percentage completion.
 */
export type Progress = {
    msg: string;
    timestamp: number;
    level: ProgressLevel;
};
/** CustomEvent carrying progress details. */
export interface ProgressEvent extends CustomEvent<Progress> {
}
/**
 * Create a Progress payload with current timestamp.
 * @param msg - The progress message.
 */
export declare function progress(msg: string, level?: ProgressLevel): Progress;
/**
 * Create a ProgressEvent with the given message.
 * @param msg - The progress message.
 */
export declare function progressEvent(msg: string, level?: ProgressLevel): ProgressEvent;
/**
 * Extract the message string from a progress event.
 * @param event - The event to extract from.
 */
export declare function progressEventMessage(event: Event): string;
/**
 * Log a progress event's message to the console.
 * @param progress - The progress event to log.
 */
export declare function logProgress(progress: ProgressEvent): void;
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