Confirm Before Quit


import { tyndWindow, dialog } from "@tynd/core/client";
 
let dirty = false;
let closing = false;
 
// track your app's dirty state wherever it changes
export function markDirty()   { dirty = true; }
export function markClean()   { dirty = false; }
 
tyndWindow.onCloseRequested(async (e) => {
  if (!dirty || closing) return;   // allow close
 
  e.preventDefault();               // block the close for 500 ms
 
  const discard = await dialog.confirm(
    "You have unsaved changes. Close anyway?",
    { title: "Are you sure?" },
  );
 
  if (discard) {
    closing = true;
    await tyndWindow.close("main");   // or app.exit(0) from backend
  }
});

onCloseRequested gives you a 500 ms synchronous window to decide. preventDefault() blocks the close; call tyndWindow.close(label) or app.exit() once the user confirms.

If the dialog takes longer than 500 ms — add cancelClose() to explicitly halt the pending close:


tyndWindow.onCloseRequested(async (e) => {
  if (!dirty) return;
  e.preventDefault();
 
  await tyndWindow.cancelClose();   // stop the watchdog
 
  const discard = await dialog.confirm("Unsaved changes. Close?");
  if (discard) await tyndWindow.close("main");
});

Save-and-quit variant


const choice = await dialog.openFile({
  // ... use a 3-button native dialog if you add support for it, or roll your own in HTML
});
 
// Or use a HTML modal with 3 buttons — Save, Discard, Cancel.

Tynd’s dialog.confirm is 2-button (OK / Cancel). For Save/Discard/Cancel, use an in-app HTML modal.

Related: tyndWindow events · dialog API.