import type { NELPolicy } from "./types.js";
/** Assert the {@link NELPolicy} is valid.
 * @throws {Error} If the policy include invalid field.
 */
export declare function assertValidNELPolicy(policy: NELPolicy): asserts policy;
/** Assert the input is non-negative integer. */
export declare function assertNonNegativeInteger(input: number, msg?: string): asserts input;
/** Assert the input is unit interval. */
export declare function assertUnitInterval(input: number, msg?: string): asserts input;