Ns Web Globals

Which web globals exist in NativeScript

@nativescript/core installs polyfills only for what the runtime lacks. The actual inventory (9.1):

The AbortController gap

new AbortController() at global scope throws AbortController is not defined — the polyfill exists in core but is deliberately not installed globally. fetch itself fully supports signals; you just have to import the controller:

import AbortController from '@nativescript/core/abortcontroller';

const controller = new AbortController();
const timer = setTimeout(() => controller.abort(), 5000);
try {
  const res = await fetch('https://api.example.com/feed', { signal: controller.signal });
  const data = await res.json();
} finally {
  clearTimeout(timer);
}

matchMedia works — use it

const mql = matchMedia('(orientation: landscape)');
mql.addEventListener('change', (e) => console.log('landscape?', e.matches));

Also usable for (prefers-color-scheme: dark)-style queries against the app's media-query engine — often cleaner than manual Screen/orientation plumbing.

Related

• Intl is absent on iOS (the V8 runtime ships without ICU) — format dates/numbers with NSDateFormatter/SimpleDateFormat via platform code, and keep widgets/server payloads preformatted.
• For core's HTTP helpers vs fetch trade-offs see ns-http-gotchas.

Verified 2026-08 against @nativescript/core 9.1.0-rc.3: the install list read from packages/core/globals/index.ts (installPolyfills calls; the AbortController line is commented out) and globals/polyfills/polyfill-xhr.ts; fetch signal support in packages/core/fetch. Not re-run standalone.