Function encodePacket

packages/engine.io-parser/lib/encodePacket.browser.ts:16–39

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

};

const encodePacket = (
  { type, data }: Packet,
  supportsBinary: boolean,
  callback: (encodedPacket: RawData) => void,
) => {
  if (withNativeBlob && data instanceof Blob) {
    if (supportsBinary) {
      return callback(data);
    } else {
      return encodeBlobAsBase64(data, callback);
    }
  } else if (
    withNativeArrayBuffer &&
    (data instanceof ArrayBuffer || isView(data))
  ) {
    if (supportsBinary) {
      return callback(data);
    } else {
      return encodeBlobAsBase64(new Blob([data]), callback);
    }
  }
  // plain string
  return callback(PACKET_TYPES[type] + (data || ""));
};

const encodeBlobAsBase64 = (
  data: Blob,