/**
 * @license
 * Copyright Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/** @fileoverview Internal implementations of TrustedResourceUrl. */
import { UnwrapType } from './trusted_types.js';
import { TrustedScriptURL } from './trusted_types_typings.js';
import '../environment/dev.js';
/**
 * String that is safe to use in all URL contexts in DOM APIs and HTML
 * documents; even as a reference to resources that may load in the current
 * origin (e.g. scripts and stylesheets).
 *
 * @final
 */
export declare class TrustedResourceUrl {
    private readonly privateDoNotAccessOrElseWrappedResourceUrl;
    private constructor();
    toString(): string;
}
/**
 * Builds a new `TrustedResourceUrl` from the given string, without enforcing
 * safety guarantees. It may cause side effects by creating a Trusted Types
 * policy. This shouldn't be exposed to application developers, and must only be
 * used as a step towards safe builders or safe constants.
 */
export declare function createResourceUrlInternal(value: string): TrustedResourceUrl;
/** Checks if the given value is a `TrustedResourceUrl` instance */
export declare function isResourceUrl(value: unknown): value is TrustedResourceUrl;
/**
 * Returns the value of the passed `TrustedResourceUrl` object while ensuring it
 * has the correct type.
 * Using this function directly is not common. Safe types are not meant to be
 * unwrapped, but rather passed to other APIs that consume them, like the DOM
 * wrappers in safevalues/dom.
 *
 * Returns a native `TrustedScriptURL` instance typed as {toString(): string} or a string if Trusted Types are disabled.
 */
export declare function unwrapResourceUrl(value: TrustedResourceUrl): UnwrapType<TrustedScriptURL> | string;