ump-plugin-intl

FormatJS-backed Intl polyfill for UMP. Pure JS — no native bridge.

Usage

Add the dependency and import it once at app startup. The polyfill installs itself as an import side effect — there is no function to call:

import 'ump-plugin-intl';
// globalThis.Intl is now complete; or use the named export:
import { Intl } from 'ump-plugin-intl';

On hosts with a healthy Intl (browsers, JSC, V8, Hermes-with-Intl) every per-class probe passes and nothing from FormatJS is loaded — zero cost. On hosts with a missing/broken class (e.g. Hermes 0.82 raising ClassNotFoundException), the matching @formatjs/intl-*/polyfill-force is loaded and installed onto globalThis.Intl, non-overwriting.

en + zh locale data is built in. To add more locales, install the matching FormatJS locale-data package(s) in your app — the plugin picks them up automatically at install time.

On H5 builds the dev-server resolves index.h5.ts, a no-op that re-exports the browser's native Intl.