/**
 * File class — extends Blob with name and lastModified.
 * Used by FormData when appending Blob values with a filename.
 */
declare const _name: unique symbol;
declare const _lastModified: unique symbol;
export declare class File extends Blob {
    [_name]: string;
    [_lastModified]: number;
    readonly webkitRelativePath: string;
    constructor(fileBits: BlobPart[], fileName: string, options?: FilePropertyBag);
    get name(): string;
    get lastModified(): number;
    get [Symbol.toStringTag](): string;
}
export {};