export declare class TextEncoderPolyfill implements TextEncoder {
    readonly encoding = "utf-8";
    encode(input?: string): Uint8Array<ArrayBuffer>;
    encodeInto(source: string, destination: Uint8Array): TextEncoderEncodeIntoResult;
}
export declare class TextDecoderPolyfill implements TextDecoder {
    readonly encoding = "utf-8";
    readonly fatal: boolean;
    readonly ignoreBOM: boolean;
    private pending;
    private streaming;
    private bomSeen;
    constructor(label?: string, options?: TextDecoderOptions);
    decode(input?: ArrayBuffer | ArrayBufferView, options?: TextDecodeOptions): string;
    private handleDecodeError;
}