import { Exception } from './exception.js';
export declare function mergeObjects<T extends object[]>(...objects: T): T[0];
export declare function isPlainObject(value: unknown): value is Record<string, unknown>;
export declare function normalizeHeaders(input?: HeadersInit): Record<string, string>;
export declare function isException(error: unknown): error is Exception;
export declare function makeBody(body: unknown): {
    body: Blob | FormData | URLSearchParams | ReadableStream<any>;
    type?: undefined;
} | {
    body: string;
    type: string;
};
export declare function resolveUrl(configUrl: string, baseUrl?: string, locationHref?: string): URL;
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