[feature] Add redraw function to map (#300)

Resolves #206

CHANGELOG.md

@@ -14,6 +14,7 @@
 - Migrated the production code to typescript
 - ** Breaking Change ** removed `version` from the public API
 - ** Breaking Change ** stopped supporting IE (internet explorer)
+- Added redraw function to map (#206)
 - *...Add new stuff here...*
 
 ### 🐞 Bug fixes

src/ui/map.ts

@@ -2608,6 +2608,24 @@ class Map extends Camera {
         return this;
     }
 
+    /**
+    * Force a synchronous redraw of the map.
+    * @example
+    * map.redraw();
+    * @returns {Map} `this`
+    */
+    redraw(): Map {
+        if (this.style) {
+            // cancel the scheduled update
+            if (this._frame) {
+                this._frame.cancel();
+                this._frame = null;
+            }
+            this._render(0);
+        }
+        return this;
+    }
+
     /**
      * Clean up and release all internal resources associated with this map.
      *

test/unit/ui/map.test.js

@@ -995,6 +995,16 @@ test('Map', (t) => {
         });
     });
 
+    t.test('#redraw', (t) => {
+        const map = createMap(t);
+
+        map.once('idle', () => {
+            map.once('render', () => t.end());
+
+            map.redraw();
+        });
+    });
+
     t.test('#addControl', (t) => {
         const map = createMap(t);
         const control = {