/**
 * @license
 * Copyright Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * @fileoverview Utilities for interacting with Trusted Types, create and/or
 * retrieve the policy for the library.
 */
import '../environment/dev.js';
import { TrustedTypePolicy, TrustedTypePolicyFactory } from './trusted_types_typings.js';
declare type ExposeTrustedTypes = false;
/**
 * Controls whether to expose Trusted Types to the user through unwrapper
 * functions.
 */
export declare type UnwrapType<T> = ExposeTrustedTypes extends true ? T : {
    toString(): string;
};
/** Re-exports the global trustedTypes object for convenience. */
export declare const trustedTypes: TrustedTypePolicyFactory | undefined;
/**
 * Returns the Trusted Types policy used by safevalues, or null if Trusted
 * Types are not enabled/supported.
 *
 * The first call to this function will create the policy, and all subsequent
 * calls will return the same policy.
 */
export declare function getPolicy(): TrustedTypePolicy | null;
/** Helpers for tests. */
export declare const TEST_ONLY: {
    setPolicyName(name: string): void;
    setTrustedTypes(mockTrustedTypes: TrustedTypePolicyFactory | undefined): void;
    resetDefaults(): void;
};
export {};