diff --git a/README.md b/README.md
index ffcd0a6..92e10eb 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,10 @@ var sseLyr = L.geoSSE(null, {
 Alternatively you can initialize with some existing data when you want to establish the initial state by loading previously created features on connection to event stream.
 
 ```js
-var sseLyr = L.geoSSE('my-data.geojson', {
+var geojson = await fetch('my-data.geojson')
+geojson = await geojson.json()
+
+var sseLyr = L.geoSSE(geojson, {
     streamUrl: 'https://my-site.com/stream'
     // set other layer options...
 });
@@ -78,6 +81,13 @@ When a successful connection is established, by default the layer listens for th
 
 #### Deprecated Event Types
 
+- Add event
+  > When an `add` event is received from the server, the feature is added or updated.
+- Remove event
+  > When a `remove` event is received from the server, the feature is removed.
+
+#### Deprecated Event Types
+
 - Create event
   > When a `create` event is received from the server, the feature is added.
 - Update event
diff --git a/dist/Leaflet.GeoSSE.min.js b/dist/Leaflet.GeoSSE.min.js
index adfe71b..0802e5f 100644
--- a/dist/Leaflet.GeoSSE.min.js
+++ b/dist/Leaflet.GeoSSE.min.js
@@ -1 +1 @@
-"use strict";const GeoSSE=L.GeoJSON.extend({connectToEventStream:function(){function addFeature(feature){if(!(self.options.featureIdField||feature.id)){return console.warn("`featureIdField` option or Feature `id` field are required to add "+"a feature, so it can be updated or removed.",feature)}self.addData(feature)}function updateOrAddFeature(feature){if(!(self.options.featureIdField||feature.id)){return console.warn("`featureIdField` option or Feature `id` field are required to add "+"a feature, so it can be updated or removed.",feature)}const layer=getLayer(feature);if(!layer)return self.addData(feature);const{geometry:geometry}=layer.feature;const{type:type}=feature.geometry;if(geometry.type!==type)return console.warn("Feature type mismatch. Existing feature type is ${geometry.type} "+`and new feature type is ${type}.`,feature);layer.setLatLngs(feature.geometry.coordinates);layer.feature=feature;self.resetStyle(layer);const{onEachFeature:onEachFeature}=self.options;if(onEachFeature)onEachFeature(feature,layer)}function finderId({feature:{id:id}}){return id===this.id}function finderIdField({feature:{properties:properties}}){const{featureIdField:featureIdField}=self.options;return properties[featureIdField]===this.properties[featureIdField]}function getLayer(feature){const finder=self.options.featureIdField?finderIdField:finderId;return self.getLayers().find(finder,feature)}function removeFeature(feature){if(!(self.options.featureIdField||feature.id)){return console.warn("`featureIdField` option or Feature `id` field are required to "+"delete a feature.",feature)}const layer=getLayer(feature);if(layer){self.removeLayer(layer)}}function add(event){const geojson=JSON.parse(event.data);if(geojson.type==="Feature"){return updateOrAddFeature(geojson)}geojson.features.forEach(updateOrAddFeature)}function create(event){const geojson=JSON.parse(event.data);if(geojson.type==="Feature"){return addFeature(geojson)}geojson.features.forEach(addFeature)}function update(event){const{options:{featureIdField:featureIdField}}=self;const geojson=JSON.parse(event.data);const{properties:{[featureIdField]:id}}=geojson;for(let layer of self.getLayers())if(layer.feature.properties[featureIdField]===id){self.removeLayer(layer);self.addData(geojson)}}function remove(event){const geojson=JSON.parse(event.data);if(geojson.type==="Feature"){return removeFeature(geojson)}geojson.features.forEach(removeFeature)}const self=this;if(typeof this.options.streamUrl==="undefined"){throw Error("Undefined event streamUrl.")}const source=new EventSource(this.options.streamUrl);source.addEventListener("add",add,false);source.addEventListener("remove",remove,false);source.addEventListener("create",create,false);source.addEventListener("update",update,false);source.addEventListener("delete",remove,false);source.onopen=function(event){};source.onmessage=function(event){};source.onerror=function(event){if(source.readyState===2){self.connectToEventStream()}};this.eventSource=source},disconnect:function(){this.eventSource.close()},setStreamUrl:function(newStreamUrl){this.options.streamUrl=newStreamUrl},setFeatureIdField:function(fieldName){this.options.featureIdField=fieldName},switchStream:function(newStream,featureIdField,emptyLayer=false){if(emptyLayer){this.clearLayers()}this.setStreamUrl(newStream);if(featureIdField!==undefined){this.setFeatureIdField(featureIdField)}this.disconnect();this.connectToEventStream()}});L.geoSSE=function(data,options){return new GeoSSE(data,options)};
\ No newline at end of file
+"use strict";const GeoSSE=L.GeoJSON.extend({connectToEventStream:function(){function addFeature(feature){if(!(self.options.featureIdField||feature.id)){return console.warn("`featureIdField` option or Feature `id` field are required to add "+"a feature, so it can be updated or removed.",feature)}self.addData(feature)}function updateOrAddFeature(feature){if(!(self.options.featureIdField||feature.id)){return console.warn("`featureIdField` option or Feature `id` field are required to add "+"a feature, so it can be updated or removed.",feature)}const layer=getLayer(feature);if(!layer)return self.addData(feature);const{geometry:geometry}=layer.feature;if(geometry===null)return console.warn("Feature is unlocated.",feature);const{coordinates:[lng,lat],type:type}=feature.geometry;if(geometry.type!==type)console.warn(`Feature type mismatch: existing feature type is ${geometry.type} `+`and new feature type is ${type}.`,feature);layer.setLatLng({lat:lat,lng:lng});layer.feature=feature;self.resetStyle(layer);const{onEachFeature:onEachFeature}=self.options;if(onEachFeature)onEachFeature(feature,layer)}function finderId({feature:{id:id}}){return id===this.id}function finderIdField({feature:{properties:properties}}){const{featureIdField:featureIdField}=self.options;return properties[featureIdField]===this.properties[featureIdField]}function getLayer(feature){const finder=self.options.featureIdField?finderIdField:finderId;return self.getLayers().find(finder,feature)}function removeFeature(feature){if(!(self.options.featureIdField||feature.id)){return console.warn("`featureIdField` option or Feature `id` field are required to "+"delete a feature.",feature)}const layer=getLayer(feature);if(layer){self.removeLayer(layer)}}function add(event){const geojson=JSON.parse(event.data);if(geojson.type==="Feature"){return updateOrAddFeature(geojson)}geojson.features.forEach(updateOrAddFeature)}function create(event){const geojson=JSON.parse(event.data);if(geojson.type==="Feature"){return addFeature(geojson)}geojson.features.forEach(addFeature)}function update(event){const{options:{featureIdField:featureIdField}}=self;const geojson=JSON.parse(event.data);const{properties:{[featureIdField]:id}}=geojson;for(let layer of self.getLayers())if(layer.feature.properties[featureIdField]===id){self.removeLayer(layer);self.addData(geojson)}}function remove(event){const geojson=JSON.parse(event.data);if(geojson.type==="Feature"){return removeFeature(geojson)}geojson.features.forEach(removeFeature)}const self=this;if(typeof this.options.streamUrl==="undefined"){throw Error("Undefined event streamUrl.")}const source=new EventSource(this.options.streamUrl);source.addEventListener("add",add,false);source.addEventListener("remove",remove,false);source.addEventListener("create",create,false);source.addEventListener("update",update,false);source.addEventListener("delete",remove,false);source.onopen=function(event){};source.onmessage=function(event){};source.onerror=function(event){if(source.readyState===2){self.connectToEventStream()}};this.eventSource=source},disconnect:function(){const{eventSource:eventSource}=this;if(!eventSource)return;eventSource.close();this.eventSource=null},setStreamUrl:function(newStreamUrl){this.options.streamUrl=newStreamUrl},setFeatureIdField:function(fieldName){this.options.featureIdField=fieldName},switchStream:function(newStream,featureIdField,emptyLayer=false){if(emptyLayer){this.clearLayers()}this.setStreamUrl(newStream);if(featureIdField!==undefined){this.setFeatureIdField(featureIdField)}this.disconnect();this.connectToEventStream()}});L.geoSSE=function(data,options){return new GeoSSE(data,options)};
\ No newline at end of file
diff --git a/examples/index.html b/examples/index.html
index 1e575ed..3911809 100644
--- a/examples/index.html
+++ b/examples/index.html
@@ -1,33 +1,33 @@
 <!DOCTYPE html>
 <html>
+
   <head>
     <title>Leaflet-SSE-Test</title>
-    <link
-      rel="stylesheet"
-      href="https://unpkg.com/leaflet@1.4.0/dist/leaflet.css"
-      integrity="sha512-puBpdR0798OZvTTbP4A8Ix/l+A4dHDD0DGqYW6RQ+9jxkRFclaxxQb/SJAWZfWAkuyeQUytO7+7N4QKrDh+drA=="
-      crossorigin=""
-    />
+    <link rel="stylesheet"
+          href="https://unpkg.com/leaflet@1.4.0/dist/leaflet.css"
+          integrity="sha512-puBpdR0798OZvTTbP4A8Ix/l+A4dHDD0DGqYW6RQ+9jxkRFclaxxQb/SJAWZfWAkuyeQUytO7+7N4QKrDh+drA=="
+          crossorigin="" />
     <!-- Make sure you put this AFTER Leaflet's CSS -->
-    <script
-      src="https://unpkg.com/leaflet@1.4.0/dist/leaflet.js"
-      integrity="sha512-QVftwZFqvtRNi0ZyCtsznlKSWOStnDORoefr1enyq5mVL4tmKB3S/EnC3rRJcxCPavG10IcrVGSmPh6Qw5lwrg=="
-      crossorigin=""
-    ></script>
+    <script src="https://unpkg.com/leaflet@1.4.0/dist/leaflet.js"
+            integrity="sha512-QVftwZFqvtRNi0ZyCtsznlKSWOStnDORoefr1enyq5mVL4tmKB3S/EnC3rRJcxCPavG10IcrVGSmPh6Qw5lwrg=="
+            crossorigin=""></script>
     <script type="text/javascript" src="/static/Leaflet.GeoSSE.src.js"></script>
   </head>
   <style>
     body {
       overflow: hidden;
     }
+
     #container {
       display: flex;
       height: 100vh;
     }
+
     #map {
       height: 100%;
       width: 50vw;
     }
+
     #log {
       display: flex;
       flex-direction: column;
@@ -40,14 +40,18 @@
       padding: 10px;
       overflow-y: scroll;
     }
+
     #log pre {
       text-wrap: wrap;
     }
   </style>
+
   <body>
     <div id="container">
       <div id="map"></div>
-      <div id="log"><pre>Listening for events...</pre></div>
+      <div id="log">
+        <pre>Listening for events...</pre>
+      </div>
     </div>
     <script>
       const mymap = L.map("map").setView([38.9072, -77.0369], 13);
@@ -74,8 +78,7 @@
             const now = new Date();
             const entry = document.createElement("pre");
             const text = document.createTextNode(
-              `${eventType} (${now.toLocaleDateString()} ${now.toLocaleTimeString()}): ${
-                event.data
+              `${eventType} (${now.toLocaleDateString()} ${now.toLocaleTimeString()}): ${event.data
               }`
             );
             entry.appendChild(text);
@@ -86,4 +89,5 @@
       }
     </script>
   </body>
+
 </html>
diff --git a/package-lock.json b/package-lock.json
index dec26df..c11a619 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,25 +8,768 @@
       "name": "leaflet-geosse",
       "version": "1.2.0",
       "license": "MIT",
+      "workspaces": [
+        "examples"
+      ],
       "devDependencies": {
-        "uglify-es": ">=3.0.2"
+        "uglify-es": ">=3.3.9"
       },
       "peerDependencies": {
         "leaflet": "^1.0.0"
       }
     },
+    "examples": {
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "express": "^4.18.2"
+      },
+      "devDependencies": {
+        "@types/express": "^4.17.21"
+      }
+    },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.5",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.5.tgz",
+      "integrity": "sha512-fB3Zu92ucau0iQ0JMCFQE7b/dv8Ot07NI3KaZIkIUNXq82k4eBAqUaneXfleGY9JWskeS9y+u0nXMyspcuQrCg==",
+      "dev": true,
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.38",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.38.tgz",
+      "integrity": "sha512-K6uROf1LD88uDQqJCktA4yzL1YYAK6NgfsI0v/mTgyPKWsX1CnJ0XPSDhViejru1GcRkLWb8RlzFYJRqGUbaug==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/express": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.21.tgz",
+      "integrity": "sha512-ejlPM315qwLpaQlQDTjPdsUFSc6ZsP4AN6AlWnogPjQ7CVi7PYF3YVz+CY3jE2pwYf7E/7HlDAN0rV2GxTG0HQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "^4.17.33",
+        "@types/qs": "*",
+        "@types/serve-static": "*"
+      }
+    },
+    "node_modules/@types/express-serve-static-core": {
+      "version": "4.19.5",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.19.5.tgz",
+      "integrity": "sha512-y6W03tvrACO72aijJ5uF02FRq5cgDR9lUxddQ8vyF+GvmjJQqbzDcJngEjURc+ZsG31VI3hODNZJ2URj86pzmg==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*",
+        "@types/qs": "*",
+        "@types/range-parser": "*",
+        "@types/send": "*"
+      }
+    },
+    "node_modules/@types/http-errors": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-2.0.4.tgz",
+      "integrity": "sha512-D0CFMMtydbJAegzOyHjtiKPLlvnm3iTZyZRSZoLq2mRhDdmLfIWOCYPfQJ4cu2erKghU++QvjcUjp/5h7hESpA==",
+      "dev": true
+    },
+    "node_modules/@types/mime": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-1.3.5.tgz",
+      "integrity": "sha512-/pyBZWSLD2n0dcHE3hq8s8ZvcETHtEuF+3E7XVt0Ig2nvsVQXdghHVcEkIWjy9A0wKfTn97a/PSDYohKIlnP/w==",
+      "dev": true
+    },
+    "node_modules/@types/node": {
+      "version": "20.14.9",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.9.tgz",
+      "integrity": "sha512-06OCtnTXtWOZBJlRApleWndH4JsRVs1pDCc8dLSQp+7PpUpX3ePdHyeNSFTeSe7FtKyQkrlPvHwJOW3SLd8Oyg==",
+      "dev": true,
+      "dependencies": {
+        "undici-types": "~5.26.4"
+      }
+    },
+    "node_modules/@types/qs": {
+      "version": "6.9.15",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.15.tgz",
+      "integrity": "sha512-uXHQKES6DQKKCLh441Xv/dwxOq1TVS3JPUMlEqoEglvlhR6Mxnlew/Xq/LRVHpLyk7iK3zODe1qYHIMltO7XGg==",
+      "dev": true
+    },
+    "node_modules/@types/range-parser": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.7.tgz",
+      "integrity": "sha512-hKormJbkJqzQGhziax5PItDUTMAM9uE2XXQmM37dyd4hVM+5aVl7oVxMVUiVQn2oCQFN/LKCZdvSM0pFRqbSmQ==",
+      "dev": true
+    },
+    "node_modules/@types/send": {
+      "version": "0.17.4",
+      "resolved": "https://registry.npmjs.org/@types/send/-/send-0.17.4.tgz",
+      "integrity": "sha512-x2EM6TJOybec7c52BX0ZspPodMsQUd5L6PRwOunVyVUhXiBSKf3AezDL8Dgvgt5o0UfKNfuA0eMLr2wLT4AiBA==",
+      "dev": true,
+      "dependencies": {
+        "@types/mime": "^1",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/serve-static": {
+      "version": "1.15.7",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.7.tgz",
+      "integrity": "sha512-W8Ym+h8nhuRwaKPaDw34QUkwsGi6Rc4yYqvKFo5rm2FUEhCFbzVWrxXUxuKK8TASjWsysJY0nsmNCGhCOIsrOw==",
+      "dev": true,
+      "dependencies": {
+        "@types/http-errors": "*",
+        "@types/node": "*",
+        "@types/send": "*"
+      }
+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
+    },
+    "node_modules/body-parser": {
+      "version": "1.20.2",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.2.tgz",
+      "integrity": "sha512-ml9pReCu3M61kGlqoTm2umSXTlRTuGTx0bfYj+uIUKKYycG5NtSbeetV3faSU6R7ajOPw0g/J1PvK4qNy7s5bA==",
+      "dependencies": {
+        "bytes": "3.1.2",
+        "content-type": "~1.0.5",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "on-finished": "2.4.1",
+        "qs": "6.11.0",
+        "raw-body": "2.5.2",
+        "type-is": "~1.6.18",
+        "unpipe": "1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
+    "node_modules/bytes": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
+      "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/call-bind": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.7.tgz",
+      "integrity": "sha512-GHTSNSYICQ7scH7sZ+M2rFopRoLh8t2bLSW6BbgrtLsahOIB5iyAVJf9GjWK3cYTDaMj4XdBpM1cA6pIS0Kv2w==",
+      "dependencies": {
+        "es-define-property": "^1.0.0",
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2",
+        "get-intrinsic": "^1.2.4",
+        "set-function-length": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/commander": {
       "version": "2.13.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.13.0.tgz",
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       "dev": true
     },
+    "node_modules/content-disposition": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
+      "integrity": "sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==",
+      "dependencies": {
+        "safe-buffer": "5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/content-type": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
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+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.6.0.tgz",
+      "integrity": "sha512-U71cyTamuh1CRNCfpGY6to28lxvNwPG4Guz/EVjgf3Jmzv0vlDp1atT9eS5dDjMYHucpHbWns6Lwf3BKz6svdw==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
+    },
+    "node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/define-data-property": {
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+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
+    },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "uglify-es": {
       "version": "3.3.9",
       "resolved": "https://registry.npmjs.org/uglify-es/-/uglify-es-3.3.9.tgz",
@@ -81,6 +1458,27 @@
         "commander": "~2.13.0",
         "source-map": "~0.6.1"
       }
+    },
+    "undici-types": {
+      "version": "5.26.5",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+      "dev": true
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ=="
+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA=="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
     }
   }
 }
diff --git a/package.json b/package.json
index b9bb0ad..8fe1ebd 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "browser": "dist/Leaflet.GeoSSE.min.js",
   "main": "src/Leaflet.GeoSSE.src.js",
   "devDependencies": {
-    "uglify-es": ">=3.0.2"
+    "uglify-es": ">=3.3.9"
   },
   "peerDependencies": {
     "leaflet": "^1.0.0"
diff --git a/src/Leaflet.GeoSSE.src.js b/src/Leaflet.GeoSSE.src.js
index 86ef8d0..1a5b5a6 100644
--- a/src/Leaflet.GeoSSE.src.js
+++ b/src/Leaflet.GeoSSE.src.js
@@ -37,18 +37,23 @@ const GeoSSE = L.GeoJSON.extend({
       // Layer not found, add it
       if (!layer) return self.addData(feature);
 
-      // Check for feature type mismatch
       const {geometry} = layer.feature;
-      const {type} = feature.geometry;
 
+      // Check if the feature is unlocated
+      if(geometry === null)
+        return console.warn("Feature is unlocated.", feature);
+
+      const {coordinates: [lng, lat], type} = feature.geometry;
+
+      // Check for feature type mismatch
       if(geometry.type !== type)
-        return console.warn(
-          "Feature type mismatch. Existing feature type is ${geometry.type} " +
+        console.warn(
+          `Feature type mismatch: existing feature type is ${geometry.type} ` +
           `and new feature type is ${type}.`, feature
         );
 
       // Update the position of the Marker
-      layer.setLatLngs(feature.geometry.coordinates);
+      layer.setLatLng({lat, lng});
 
       // Re-init the layer
       layer.feature = feature;
@@ -209,7 +214,12 @@ const GeoSSE = L.GeoJSON.extend({
    * Disconnect from the event server and unsubscribe from all event streams.
    */
   disconnect: function () {
-    this.eventSource.close();
+    const {eventSource} = this;
+
+    if(!eventSource) return;
+
+    eventSource.close();
+    this.eventSource = null;
   },
 
   /**