export interface HeaderStore {
    [x: string]: string[];
}
export declare class Headers {
    private headers;
    getAll(): HeaderStore;
    get(name: string): string | undefined;
    set(name: string, value: number | string | string[]): void;
    append(name: string, value: number | string): void;
    has(name: string): boolean;
    remove(name: string): void;
}