theseus/error-preload.js

const { contextBridge, ipcRenderer } = require("electron");
// Renderer -> main API for the branded error page. All calls are user-initiated
// button clicks; main validates the sender before acting so a hostile page
// can't drive navigation by loading window.errorpage.
contextBridge.exposeInMainWorld("errorpage", {
  retry:      (url)  => ipcRenderer.invoke("error-retry", url),
  goHome:     ()     => ipcRenderer.invoke("error-home"),
  searchFor:  (text) => ipcRenderer.invoke("error-search", text),
  registerOnSirius: (host) => ipcRenderer.invoke("error-register", host),
  openExternal:     (url)  => ipcRenderer.invoke("error-open-external", url),
  bnsSimilar:       (host) => ipcRenderer.invoke("error-bns-similar", host),
  // ICANN "did you mean?" — alternative-TLD swaps + history matches for a
  // host whose DNS failed. See icannAlternatives() in main.js.
  icannAlternatives: (host) => ipcRenderer.invoke("error-icann-alternatives", host),
});