import type { HeadersObject } from "./types";
export declare function rawHeaders(headers: HeadersObject): never[];
type Fn = (...args: any[]) => any;
export declare function mergeFns(...functions: Fn[]): (...args: any[]) => void;
export declare function createNotImplementedError(name: string): void;
export declare function notImplemented(name: string): (() => any) & {
    __unenv__: boolean;
};
export declare function notImplementedClass<T = unknown>(name: string): T;
export {};