Add tile server types

app/src/tiles/types.ts

@@ -0,0 +1,43 @@
+import { Image } from 'mapnik';
+
+/**
+ * Bounding box in the format [w, s, e, n]
+ */
+type BoundingBox = [number, number, number, number];
+
+interface TileParams {
+    /**
+     * Name of tileset to which the tile belongs
+     */
+    tileset: string;
+
+    /**
+     * Zoom level
+     */
+    z: number;
+
+    /**
+     * X coordinate of tile (corresponds to longitude)
+     */
+    x: number;
+
+    /**
+     * Y coordinate of tile (corresponds to latitude)
+     */
+    y: number;
+
+    /**
+     * Resolution scale factor for higher pixel density tiles (e.g. x2)
+     */
+    scale: number;
+}
+
+interface TileRenderer {
+    getTile(tileParams: TileParams, dataParams: any): Promise<Image>
+}
+
+export {
+    BoundingBox,
+    TileParams,
+    TileRenderer
+};