/**
 * Sleep for `ms` milliseconds. Supports cooperative cancellation via AbortSignal.
 */
export declare function sleep(ms: number, signal?: AbortSignal): Promise<void>;
/**
 * Calculate the delay for a given attempt using the specified backoff strategy.
 */
export declare function calculateDelay(attempt: number, baseDelay: number, strategy: 'constant' | 'linear' | 'exponential' | 'decorrelatedJitter', maxDelay: number, previousDelay?: number): number;
/**
 * Validate that a number is a positive integer.
 */
export declare function assertPositiveInteger(value: number, name: string): void;
/**
 * Validate that a number is a positive finite number.
 */
export declare function assertPositive(value: number, name: string): void;
/**
 * Validate that a number is a non-negative finite number.
 */
export declare function assertNonNegative(value: number, name: string): void;
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