added typings for mapbox-gl-leaflet (#25120)

* added typings for mapbox-gl-leaflet

* fixed build errors

types/mapbox-gl-leaflet/index.d.ts

@@ -0,0 +1,20 @@
+// Type definitions for mapbox-gl-leaflet 0.0
+// Project: https://github.com/brunob/leaflet.fullscreen
+// Definitions by: Alexey Gorshkov <https://github.com/agorshkov23>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import * as L from 'leaflet';
+
+declare module 'leaflet' {
+  class MapboxGL extends Layer {
+    constructor(options: MapboxGLOptions);
+  }
+
+  function mapboxGL(options: MapboxGLOptions): MapboxGL;
+
+  interface MapboxGLOptions {
+    accessToken: string;
+    style: string;
+  }
+}

types/mapbox-gl-leaflet/mapbox-gl-leaflet-tests.ts

@@ -0,0 +1,14 @@
+import * as L from 'leaflet';
+
+const token = 'token';
+
+const map = L.map('map').setView([38.912753, -77.032194], 15);
+L.marker([38.912753, -77.032194])
+    .bindPopup("Hello <b>Leaflet GL</b>!<br>Whoa, it works!")
+    .addTo(map)
+    .openPopup();
+
+const gl = L.mapboxGL({
+    accessToken: token,
+    style: 'mapbox://styles/mapbox/bright-v8'
+}).addTo(map);

types/mapbox-gl-leaflet/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "strictNullChecks": true,
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "mapbox-gl-leaflet-tests.ts"
+    ]
+}

types/mapbox-gl-leaflet/tslint.json

@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}