engine.io-parser

const protocol: number;

createPacketDecoderStream: (maxPayload: number, binaryType: BinaryType) => any;

createPacketEncoderStream: () => any;

decodePacket: (encodedPacket: RawData, binaryType?: BinaryType) => Packet;

decodePayload: (encodedPayload: string, binaryType?: BinaryType) => Packet[];

encodePacket: (
    { type, data }: Packet,
    supportsBinary: boolean,
    callback: (encodedPacket: RawData) => void
) => void;

encodePayload: (
    packets: Packet[],
    callback: (encodedPayload: string) => void
) => void;

type BinaryType = 'nodebuffer' | 'arraybuffer' | 'blob';

type PacketType =
    | 'open'
    | 'close'
    | 'ping'
    | 'pong'
    | 'message'
    | 'upgrade'
    | 'noop'
    | 'error';

type RawData = any;