import { type Deadline } from '../backend-contract/primitives.js';
/**
 * Application-facing operation controls. Timeouts are expressed as a monotonic
 * wall-clock delta and normalized once to an internal Deadline; advanced callers
 * use `/advanced` with an exact Deadline.
 */
export interface OperationOptions {
    readonly signal?: AbortSignal;
    readonly timeoutMs?: number;
}
export interface NormalizedOperationOptions {
    readonly signal: AbortSignal | null;
    readonly deadline: Deadline | null;
}
/**
 * Centralized application option normalization.
 *
 * - validates `signal` and `timeoutMs` exactly once per public entry
 * - composes an outer signal with internal cancellation without losing cause
 * - preserves an earlier deadline when a helper calls another helper
 * - converts `timeoutMs` to a monotonic Deadline using the provided `now`
 */
export declare function normalizeOperationOptions(options: OperationOptions | undefined, now: () => number, existingDeadline?: Deadline | null): NormalizedOperationOptions;
export declare function disposeComposedAbortSignal(signal: AbortSignal | null | undefined): void;
export declare function composeAbortSignal(outer: AbortSignal | null, inner: AbortSignal | null): AbortSignal | null;
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