Add types for mediawiki.deflate

adapted from #32

mw/deflate.d.ts

@@ -0,0 +1,22 @@
+declare global {
+    namespace mw {
+        /**
+         * Compress the content and add the 'rawdeflate,' prefix.
+         *
+         * @example
+         * ```js
+         * mw.loader.using( 'mediawiki.deflate' ).then( function () {
+         *     var deflated = mw.deflate( myContent );
+         * } );
+         * ```
+         *
+         * @param {string|ArrayBuffer} data Undeflated data
+         * @returns {string} Deflated data
+         * @see https://github.com/wikimedia/mediawiki/blob/master/resources/src/mediawiki.deflate/mw.deflate.js#L3
+         * @see https://doc.wikimedia.org/mediawiki-core/master/php/classDeflate.html
+         */
+        function deflate(data: string | ArrayBuffer): `rawdeflate,${string}`;
+    }
+}
+
+export {};

mw/index.d.ts

@@ -3,6 +3,7 @@ import "./config";
 import "./confirmCloseWindow";
 import "./cookie";
 import "./debug";
+import "./deflate";
 import "./ForeignApi";
 import "./ForeignRest";
 import "./global";