Add ESM support

leaflet.rotatedMarker.esm.js

@@ -0,0 +1,61 @@
+import * as L from 'leaflet';
+
+(function (L) {
+    // save these original methods before they are overwritten
+    var proto_initIcon = L.Marker.prototype._initIcon;
+    var proto_setPos = L.Marker.prototype._setPos;
+
+    var oldIE = (L.DomUtil.TRANSFORM === 'msTransform');
+
+    L.Marker.addInitHook(function () {
+        var iconOptions = this.options.icon && this.options.icon.options;
+        var iconAnchor = iconOptions && this.options.icon.options.iconAnchor;
+        if (iconAnchor) {
+            iconAnchor = (iconAnchor[0] + 'px ' + iconAnchor[1] + 'px');
+        }
+        this.options.rotationOrigin = this.options.rotationOrigin || iconAnchor || 'center bottom' ;
+        this.options.rotationAngle = this.options.rotationAngle || 0;
+
+        // Ensure marker keeps rotated during dragging
+        this.on('drag', function(e) { e.target._applyRotation(); });
+    });
+
+    L.Marker.include({
+        _initIcon: function() {
+            proto_initIcon.call(this);
+        },
+
+        _setPos: function (pos) {
+            proto_setPos.call(this, pos);
+            this._applyRotation();
+        },
+
+        _applyRotation: function () {
+            if(this.options.rotationAngle) {
+                this._icon.style[L.DomUtil.TRANSFORM+'Origin'] = this.options.rotationOrigin;
+
+                if(oldIE) {
+                    // for IE 9, use the 2D rotation
+                    this._icon.style[L.DomUtil.TRANSFORM] = 'rotate(' + this.options.rotationAngle + 'deg)';
+                } else {
+                    // for modern browsers, prefer the 3D accelerated version
+                    this._icon.style[L.DomUtil.TRANSFORM] += ' rotateZ(' + this.options.rotationAngle + 'deg)';
+                }
+            }
+        },
+
+        setRotationAngle: function(angle) {
+            this.options.rotationAngle = angle;
+            this.update();
+            return this;
+        },
+
+        setRotationOrigin: function(origin) {
+            this.options.rotationOrigin = origin;
+            this.update();
+            return this;
+        }
+    });
+})(L);
+
+export default L;