Adds more ResolvedDateTimeFormatOptions to the Intl APIs

Author: orta

src/lib/es2021.d.ts

@@ -2,3 +2,4 @@
 /// <reference lib="es2021.promise" />
 /// <reference lib="es2021.string" />
 /// <reference lib="es2021.weakref" />
+/// <reference lib="es2021.intl" />

src/lib/es2021.intl.d.ts

@@ -8,6 +8,15 @@ declare namespace Intl {
         fractionalSecondDigits?: 0 | 1 | 2 | 3 | undefined;
     }
 
+    interface ResolvedDateTimeFormatOptions {
+        formatMatcher?: "basic" | "best fit" | "best fit";
+        dateStyle?: "full" | "long" | "medium" | "short";
+        timeStyle?: "full" | "long" | "medium" | "short";
+        hourCycle?: "h11" | "h12" | "h23" | "h24"
+        dayPeriod?: "narrow" | "short" | "long";
+        fractionalSecondDigits?: 0 | 1 | 2 | 3;
+    }
+
     interface NumberFormat {
         formatRange(startDate: number | bigint, endDate: number | bigint): string;
         formatRangeToParts(startDate: number | bigint, endDate: number | bigint): NumberFormatPart[];