export interface HeadersInit {
    [key: string]: string | number;
}
export declare class Headers {
    [k: string]: string | number | any;
    constructor(init?: HeadersInit);
    get(name: string): string;
    append(key: string, value: string | number): void;
    has(key: string): boolean;
    raw(): {
        [k: string]: string[];
    };
}