Update type definitions with changes from Luxon 1.13 to 1.15 (#35760)

* Added changes from Luxon 1.14 and 1.15

* Removed patch version from header

* Added new definition author

types/luxon/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for luxon 1.13
+// Type definitions for luxon 1.15
 // Project: https://github.com/moment/luxon#readme
 // Definitions by: Colby DeHart <https://github.com/colbydehart>
 //                 Hyeonseok Yang <https://github.com/FourwingsY>
@@ -7,6 +7,7 @@
 //                 Pietro Vismara <https://github.com/pietrovismara>
 //                 Janeene Beeforth <https://github.com/dawnmist>
 //                 Jason Yu <https://github.com/ycmjason>
+//                 Miklos Danka <https://github.com/mdanka>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
@@ -496,8 +497,11 @@ export interface ZoneOffsetOptions {
     localeCode?: string;
 }
 
+export type ZoneOffsetFormat = 'narrow' | 'short' | 'techie';
+
 export class Zone {
     offsetName(ts: number, options?: ZoneOffsetOptions): string;
+    formatOffset(ts: number, format: ZoneOffsetFormat): string;
     isValid: boolean;
     name: string;
     type: string;

types/luxon/luxon-tests.ts

@@ -10,6 +10,7 @@ import {
     IANAZone,
     Zone,
     ZoneOffsetOptions,
+    ZoneOffsetFormat,
 } from 'luxon';
 
 /* DateTime */
@@ -26,10 +27,13 @@ const fromObject = DateTime.fromObject({
 });
 
 const ianaZone = new IANAZone('America/Los_Angeles');
-IANAZone.create("Europe/London");
+const testIanaZone = IANAZone.create("Europe/London");
 IANAZone.isValidSpecifier("Europe/London");
 IANAZone.isValidZone("Europe/London");
 IANAZone.resetCache();
+testIanaZone.formatOffset(dt.toMillis(), 'narrow'); // => +1
+testIanaZone.formatOffset(dt.toMillis(), 'short'); // => +01:00
+testIanaZone.formatOffset(dt.toMillis(), 'techie'); // => +0100
 const ianaZoneTest = DateTime.fromObject({
     zone: ianaZone,
 });
@@ -328,6 +332,9 @@ class SampleZone extends Zone {
     offsetName(ts: number, options?: ZoneOffsetOptions) {
         return 'SampleZone';
     }
+    formatOffset(ts: number, format: ZoneOffsetFormat) {
+        return '+6';
+    }
     equals(other: Zone) {
         return other.name === this.name;
     }