add AVIF enum in JS client [#116]

js/adapters.ts

@@ -27,6 +27,8 @@ export const leafletRasterLayer = (source: PMTiles, options: any) => {
             mimeType = "image/jpeg";
           } else if (header.tileType == 4) {
             mimeType = "image/webp";
+          } else if (header.tileType == 5) {
+            mimeType = "image/avif";
           }
         });
         loaded = true;

js/index.ts

@@ -177,6 +177,7 @@ export enum TileType {
   Png = 2,
   Jpeg = 3,
   Webp = 4,
+  Avif = 5,
 }
 
 const HEADER_SIZE_BYTES = 127;