Add support for Temporal objects

Author: connor-baer

.changeset/eight-ties-fetch.md

@@ -0,0 +1,5 @@
+---
+'@sumup/intl': major
+---
+
+Added support for Temporal objects to the date and time formatting functions. The [`temporal-polyfill`](https://www.npmjs.com/package/temporal-polyfill) package is now a required peer dependency.

package-lock.json

@@ -53,10 +53,14 @@
     "jest": "^29.7.0",
     "jest-extended": "^4.0.2",
     "license-checker": "^25.0.1",
+    "temporal-polyfill": "^0.2.5",
     "ts-jest": "^29.1.4",
     "typedoc": "^0.25.13",
     "typedoc-github-wiki-theme": "^2.0.0",
     "typedoc-plugin-markdown": "^4.0.3",
     "typescript": "^5.4.5"
+  },
+  "peerDependencies": {
+    "temporal-polyfill": "0.2.x"
   }
 }

package.json

@@ -13,6 +13,7 @@
  * limitations under the License.
  */
 
+import { Intl as IntlWithTemporal } from 'temporal-polyfill';
 import memoizeFormatConstructor from 'intl-format-cache';
 
 import { Locale } from '../../types';
@@ -61,8 +62,8 @@ export const isDateTimeStyleSupported = (() => {
 })();
 
 export const getDateTimeFormat = memoizeFormatConstructor(
-  Intl.DateTimeFormat,
+  IntlWithTemporal.DateTimeFormat,
 ) as (
   locales?: Locale | Locale[],
   options?: Intl.DateTimeFormatOptions,
-) => Intl.DateTimeFormat;
+) => IntlWithTemporal.DateTimeFormat;