mattermost-plugin-shelfmark/webapp/tests/setup_globals.js

/* eslint-disable no-undef, import/order */
// Polyfill web APIs for jsdom test environment (required by undici)
const {Blob} = require('buffer');
const {ReadableStream, WritableStream, TransformStream} = require('stream/web');

class File extends Blob {
    constructor(chunks, name, options = {}) {
        super(chunks, options);
        this.name = name;
        this.lastModified = options.lastModified || Date.now();
    }
}

class MessagePort {}

if (typeof global.DOMException === 'undefined') {
    global.DOMException = class DOMException extends Error {
        constructor(message, name) {
            super(message);
            this.name = name || 'Error';
        }
    };
}

Object.assign(global, {
    ReadableStream,
    WritableStream,
    TransformStream,
    Blob,
    File,
    MessagePort,
});