/**
 * @license
 * Copyright Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/** @fileoverview Internal implementations of SafeScript. */
import { UnwrapType } from './trusted_types.js';
import { TrustedScript } from './trusted_types_typings.js';
import '../environment/dev.js';
/**
 * JavaScript code that is safe to evaluate and use as the content of an HTML
 * script element.
 *
 * @final
 */
export declare class SafeScript {
    private readonly privateDoNotAccessOrElseWrappedScript;
    private constructor();
    toString(): string;
}
/**
 * Builds a new `SafeScript` 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 createScriptInternal(value: string): SafeScript;
/**
 * An empty `SafeScript` constant.
 * Unlike the functions above, using this will not create a policy.
 */
export declare const EMPTY_SCRIPT: SafeScript;
/** Checks if the given value is a `SafeScript` instance */
export declare function isScript(value: unknown): value is SafeScript;
/**
 * Returns the value of the passed `SafeScript` 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 `TrustedScript` instance typed as {toString(): string} or a string if Trusted Types are disabled.
 */
export declare function unwrapScript(value: SafeScript): UnwrapType<TrustedScript> | string;