/**
 * @license
 * Copyright Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * @fileoverview
 * Functions which allow fetch() on resourceUrls to be
 * interpreted as SafeHtml or SafeScript.
 */
import { SafeHtml } from '../../internals/html_impl.js';
import { TrustedResourceUrl } from '../../internals/resource_url_impl.js';
import { SafeScript } from '../../internals/script_impl.js';
import { SafeStyleSheet } from '../../internals/style_sheet_impl.js';
/**
 * IncorrectTypeError represents an error that can occur with {@link
 * fetchResourceUrl} when the server responds with a content type that would be
 * unsafe for the type of content requested.
 */
export declare class IncorrectContentTypeError extends Error {
    readonly url: string;
    readonly typeName: string;
    readonly contentType: string;
    constructor(url: string, typeName: string, contentType: string);
}
/**
 * A SafeResponse is the response value of a {@link fetchResourceUrl} call.
 */
export interface SafeResponse {
    /**
     * html returns this {@link Response} as a SafeHtml, or throws an error.
     */
    html(): Promise<SafeHtml>;
    /**
     * script returns the fetch response as a {@link SafeScript}, or returns an
     * error.
     */
    script(): Promise<SafeScript>;
    /**
     * styleSheet returns the fetch response as a {@link SafeStyleSheet}, or
     * returns an error.
     */
    styleSheet(): Promise<SafeStyleSheet>;
}
/**
 * fetches a given {@link TrustedResourceUrl},
 * and returns a value which can be turned into a given safe type.
 */
export declare function fetchResourceUrl(u: TrustedResourceUrl, init?: RequestInit): Promise<SafeResponse>;