export declare class FormData {
    #private;
    constructor();
    Append(key: string, value: unknown): void;
    append(key: string, value: unknown): void;
    Set(key: string, value: unknown): void;
    set(key: string, value: unknown): void;
    Delete(key: string): void;
    delete(key: string): void;
    Get(key: string): unknown;
    get(key: string): unknown;
    GetAll(key: string): unknown[] | null;
    getAll(key: string): unknown[] | null;
    Has(key: string): boolean;
    has(key: string): boolean;
    Keys(): string[];
    keys(): string[];
    Values(): unknown[];
    values(): unknown[];
    Entries(): unknown[][];
    entries(): unknown[][];
    toMultipart(): {
        body: Uint8Array;
        contentType: string;
    };
    toMultipartAsync(): Promise<{
        body: Uint8Array;
        contentType: string;
    }>;
}
