workaround-renderer.ts

// This module shall be imported from BrowserWindow's main modules. The node main thread should instead import "workaround-ipc".
// NOTE: This gist shall not be used if Electron solves issue https://github.com/electron/electron/issues/37417

import Dexie from "dexie";
import { ipcRenderer } from "electron";

if ("unref" in BroadcastChannel.prototype) {
    // Node's BroadcastChannel has the `unref()` method.
    // Seems we got the Node- and not the DOM version of BroadcastChannel.
    // Only activate this workaround when we have the Node-version of BroadcastChannel
    // in the BrowserWindow, since the issue seems to be connected to that trait.
    let propagatingLocally = false;

    Dexie.on("storagemutated", (changedParts) => {
        if (!propagatingLocally)
            ipcRenderer.send(
                "dexie-storagemutated",
                JSON.stringify(changedParts)
            );
    });

    ipcRenderer.on("dexie-storagemutated", (event, json) => {
        const changedParts = JSON.parse(json);
        propagatingLocally = true;
        try {
            Dexie.on.storagemutated.fire(changedParts);
        } finally {
            propagatingLocally = false;
        }
    });
}