/**
 * Calls `globalThis.fetch` and determines which type of error to show for non-200 responses.
 */
export declare function fetch(...args: Parameters<typeof globalThis.fetch>): Promise<Response>;
/**
 * Calls `globalThis.fetch` and throws a `FetchError` on non-200 responses, but also
 * decodes the response body as JSON, casting it to type `T`. Returns the
 * decoded body.
 */
export declare function fetchJson<T>(...args: Parameters<typeof globalThis.fetch>): Promise<T>;
export interface StatusError extends Error {
    status: number;
}
/**
 * Error thrown when fetch returns a non-200 response.
 */
export declare class FetchError extends Error implements StatusError {
    status: number;
    constructor(response: Readonly<Response>);
}
/**
 * General error type for an error that has a message that is OK to show to the end user.
 */
export declare class UserFriendlyError extends Error implements StatusError {
    status: number;
    constructor(message: string, status: number);
}
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