import type { CodeModeContinuation, UnsignedCodeModeContinuation } from "./types.js";
/**
 * Sets the process-global continuation signing key.
 *
 * Hosts that need approval or interrupt continuations to survive process
 * restarts must configure the same secret before creating and resuming
 * continuations. Calling without arguments restores a random process-local key.
 *
 * @param key - Secret key bytes or UTF-8 string, or `undefined` to reset.
 * @param options - Optional continuation signing policy.
 */
export declare function setCodeModeContinuationSigningKey(key?: string | Uint8Array, options?: {
    maxAgeMs?: number;
}): void;
/**
 * Signs a host-created continuation as an unforgeable bearer capability.
 *
 * @internal
 */
export declare function signCodeModeContinuation(continuation: UnsignedCodeModeContinuation): CodeModeContinuation;
/**
 * Verifies that a continuation was issued by this host and has not expired.
 *
 * @internal
 */
export declare function verifyCodeModeContinuation(continuation: CodeModeContinuation): void;
/**
 * Returns whether a value is a currently valid signed continuation.
 *
 * @internal
 */
export declare function hasValidCodeModeContinuationCapability(value: unknown): value is CodeModeContinuation;
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