Extends DateTimeFormatOptions for new Intl APIs - re: microsoft#45420

Author: orta

src/lib/es2020.intl.d.ts

@@ -225,6 +225,13 @@ declare namespace Intl {
         fractionalSecondDigits?: 0 | 1 | 2 | 3;
     }
 
+    interface DateTimeFormatOptions {
+        dateStyle?: "full" | "long" | "medium" | "short";
+        timeStyle?: "full" | "long" | "medium" | "short";
+        dayPeriod?: "narrow" | "short" | "long";
+        hourCycle?: "h11" | "h12" | "h23" | "h24";
+    }
+
     type LocaleHourCycleKey = "h12" | "h23" | "h11" | "h24";
     type LocaleCollationCaseFirst = "upper" | "lower" | "false";