node_modules/engine.io-parser/build/esm/encodePacket.browser.js

import { PACKET_TYPES } from "./commons.js";
const withNativeBlob = typeof Blob === "function" ||
    (typeof Blob !== "undefined" &&
        Object.prototype.toString.call(Blob) === "[object BlobConstructor]");
const withNativeArrayBuffer = typeof ArrayBuffer === "function";
// ArrayBuffer.isView method is not defined in IE10
const isView = obj => {
    return typeof ArrayBuffer.isView === "function"
        ? ArrayBuffer.isView(obj)
        : obj && obj.buffer instanceof ArrayBuffer;
};
const encodePacket = ({ type, data }, supportsBinary, callback) => {
    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, callback) => {
    const fileReader = new FileReader();
    fileReader.onload = function () {
        const content = fileReader.result.split(",")[1];
        callback("b" + (content || ""));
    };
    return fileReader.readAsDataURL(data);
};
export default encodePacket;