/**
 * Cancellation Support
 *
 * Provides operation cancellation capabilities using AbortController/AbortSignal.
 * Compatible with Node.js streams and async operations.
 */
export declare class CancellableOperation {
    private abortController;
    private startTime;
    private cancelledAt?;
    private reason?;
    constructor();
    /**
     * Get AbortSignal for use with operations
     */
    getSignal(): AbortSignal;
    /**
     * Cancel the operation with optional reason
     */
    cancel(reason?: string): void;
    /**
     * Check if operation has been cancelled
     */
    isCancelled(): boolean;
    /**
     * Get cancellation reason
     */
    getReason(): string | undefined;
    /**
     * Get time when operation was cancelled
     */
    getCancelledAt(): number | undefined;
    /**
     * Get duration before cancellation (milliseconds)
     */
    getDurationBeforeCancel(): number | undefined;
    /**
     * Execute operation with timeout
     */
    withTimeout<T>(operation: (signal: AbortSignal) => Promise<T>, timeoutMs: number): Promise<T>;
    /**
     * Create a child cancellable operation
     * When parent is cancelled, child is automatically cancelled
     */
    createChild(): CancellableOperation;
}
/**
 * Execute multiple operations with shared cancellation
 */
export declare class CancellableGroup {
    private operations;
    private mainController;
    /**
     * Add operation to group
     */
    add(): CancellableOperation;
    /**
     * Cancel all operations in group
     */
    cancelAll(reason?: string): void;
    /**
     * Check if any operation is cancelled
     */
    isAnyCancelled(): boolean;
    /**
     * Check if all operations are cancelled
     */
    isAllCancelled(): boolean;
    /**
     * Get count of cancelled operations
     */
    getCancelledCount(): number;
}
/**
 * Utility: Create a race between operation and cancellation
 */
export declare function raceWithCancellation<T>(operation: Promise<T>, signal: AbortSignal): Promise<T>;
/**
 * Utility: Delay with cancellation support
 */
export declare function delay(ms: number, signal?: AbortSignal): Promise<void>;
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