diff --git a/.gitignore b/.gitignore
index 344d16229..421aeb139 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ ui-tests/.yarn/
 ipyleaflet/nbextension/
 ipyleaflet/labextension/
 js/dist/
+js/lib/
 
 # OS X
 .DS_Store
diff --git a/js/.eslintignore b/js/.eslintignore
index f06235c46..468bb8912 100644
--- a/js/.eslintignore
+++ b/js/.eslintignore
@@ -1,2 +1,3 @@
 node_modules
 dist
+lib
diff --git a/js/.prettierignore b/js/.prettierignore
index f06235c46..4c257dee7 100644
--- a/js/.prettierignore
+++ b/js/.prettierignore
@@ -1,2 +1,3 @@
 node_modules
 dist
+lib
\ No newline at end of file
diff --git a/js/src/jupyter-leaflet.css b/js/css/jupyter-leaflet.css
similarity index 100%
rename from js/src/jupyter-leaflet.css
rename to js/css/jupyter-leaflet.css
diff --git a/js/package.json b/js/package.json
index ed3cb4dda..fea6ea29a 100644
--- a/js/package.json
+++ b/js/package.json
@@ -8,23 +8,36 @@
     "jupyterlab-extension",
     "widgets"
   ],
+  "files": [
+    "css/",
+    "lib/"
+  ],
   "repository": {
     "type": "git",
     "url": "https://github.com/jupyter-widgets/ipyleaflet.git"
   },
   "license": "MIT",
   "author": "Project Jupyter",
-  "main": "src/index.js",
+  "main": "lib/index.js",
+  "types": "./lib/index.d.ts",
   "scripts": {
-    "build": "webpack && jupyter labextension build .",
-    "clean": "rimraf dist/ && rimraf ../ipyleaflet/labextension/ && rimraf ../ipyleaflet/nbextension",
-    "prepublish": "npm run clean && npm run build",
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "watch": "run-p watch:src watch:labextension",
-    "watch:src": "webpack --watch",
-    "watch:labextension": "jupyter labextension watch .",
-    "lint": "eslint . --fix && prettier --write .",
-    "lint:check": "eslint . && prettier ."
+    "build": "yarn run build:lib && yarn run build:nbextension && yarn run build:labextension",
+    "build:lib": "tsc",
+    "build:nbextension": "webpack --no-devtool",
+    "build:labextension": "jupyter labextension build .",
+    "build:extensions": "yarn run build && yarn run build:labextension",
+    "clean": "yarn run clean:lib && yarn run clean:nbextension && yarn run clean:labextension",
+    "clean:lib": "rimraf lib",
+    "clean:nbextension": "rimraf ../ipyleaflet/nbextension/index.js",
+    "clean:labextension": "rimraf ../ipyleaflet/labextension",
+    "lint": "yarn prettier && yarn eslint",
+    "lint:check": "yarn prettier:check && yarn eslint",
+    "prettier": "yarn prettier:base --write --list-different",
+    "prettier:base": "prettier \"**/*{.ts,.tsx,.js,.jsx,.css,.json,.md}\"",
+    "prettier:check": "yarn prettier:base --check",
+    "prepack": "yarn run build",
+    "watch:lib": "tsc -w",
+    "watch:nbextension": "webpack --watch"
   },
   "dependencies": {
     "@jupyter-widgets/base": "^2 || ^3 || ^4 || ^5 || ^6",
@@ -52,6 +65,9 @@
   },
   "devDependencies": {
     "@jupyterlab/builder": "^4.0.8",
+    "@types/leaflet": "^1.9.8",
+    "@types/node": "^20.10.5",
+    "@types/webpack-env": "^1.18.4",
     "css-loader": "^3.4.2",
     "eslint": "^8.23.1",
     "eslint-config-prettier": "^8.5.0",
@@ -64,12 +80,15 @@
     "npm-run-all": "^4.1.5",
     "prettier": "^2.7.1",
     "rimraf": "^2.6.1",
+    "source-map-loader": "^4.0.1",
     "style-loader": "^1.1.2",
+    "ts-loader": "^9.5.1",
+    "typescript": "^5.3.3",
     "webpack": "^5",
     "webpack-cli": "^5.1.4"
   },
   "jupyterlab": {
-    "extension": "src/jupyterlab-plugin",
+    "extension": "lib/jupyterlab-plugin",
     "outputDir": "../ipyleaflet/labextension",
     "webpackConfig": "webpack.lab.config.js",
     "sharedPackages": {
diff --git a/js/src/Map.js b/js/src/Map.ts
similarity index 98%
rename from js/src/Map.js
rename to js/src/Map.ts
index eb1e37604..ec0ade848 100644
--- a/js/src/Map.js
+++ b/js/src/Map.ts
@@ -1,10 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+// @ts-nocheck
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('./leaflet.js');
-const utils = require('./utils.js');
-const proj = require('./projections.js');
+import * as widgets from '@jupyter-widgets/base';
+import L from './leaflet';
+import * as utils from './utils';
+import * as proj from './projections';
 
 const DEFAULT_LOCATION = [0.0, 0.0];
 
@@ -448,7 +449,7 @@ export class LeafletMapView extends utils.LeafletDOMWidgetView {
 
   _processLuminoMessage(msg, _super) {
     _super.call(this, msg);
-    if(!this.obj) return;
+    if (!this.obj) return;
     switch (msg.type) {
       case 'resize':
         // We set the dirty flag to true to prevent the sub-pixel error
diff --git a/js/amd-public-path.js b/js/src/amd-public-path.ts
similarity index 92%
rename from js/amd-public-path.js
rename to js/src/amd-public-path.ts
index fbe201426..a86107f80 100644
--- a/js/amd-public-path.js
+++ b/js/src/amd-public-path.ts
@@ -1,7 +1,9 @@
 // In an AMD module, we set the public path using the magic requirejs 'module' dependency
 // See https://github.com/requirejs/requirejs/wiki/Differences-between-the-simplified-CommonJS-wrapper-and-standard-AMD-define#module
 // Since 'module' is a requirejs magic module, we must include 'module' in the webpack externals configuration.
-var module = require('module');
+// @ts-nocheck
+
+import * as module from 'module';
 var url = new URL(module.uri, document.location);
 // Using lastIndexOf('/')+1 gives us the empty string if there is no '/', so pathname becomes '/'
 url.pathname = url.pathname.slice(0, url.pathname.lastIndexOf('/') + 1);
diff --git a/js/src/controls/AttributionControl.js b/js/src/controls/AttributionControl.ts
similarity index 88%
rename from js/src/controls/AttributionControl.js
rename to js/src/controls/AttributionControl.ts
index 2b4560742..7d90ac41e 100644
--- a/js/src/controls/AttributionControl.js
+++ b/js/src/controls/AttributionControl.ts
@@ -1,8 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+//@ts-nocheck
 
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletAttributionControlModel extends control.LeafletControlModel {
   defaults() {
diff --git a/js/src/controls/Control.js b/js/src/controls/Control.ts
similarity index 89%
rename from js/src/controls/Control.js
rename to js/src/controls/Control.ts
index f72c70243..5e302cea8 100644
--- a/js/src/controls/Control.js
+++ b/js/src/controls/Control.ts
@@ -1,10 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const utils = require('../utils.js');
+//@ts-nocheck
 
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as utils from '../utils';
 export class LeafletControlModel extends widgets.WidgetModel {
   defaults() {
     return {
diff --git a/js/src/controls/DrawControl.js b/js/src/controls/DrawControl.ts
similarity index 97%
rename from js/src/controls/DrawControl.js
rename to js/src/controls/DrawControl.ts
index 2c35fc0ad..10442731d 100644
--- a/js/src/controls/DrawControl.js
+++ b/js/src/controls/DrawControl.ts
@@ -1,9 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+//@ts-nocheck
+
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletDrawControlModel extends control.LeafletControlModel {
   defaults() {
diff --git a/js/src/controls/FullScreenControl.js b/js/src/controls/FullScreenControl.ts
similarity index 86%
rename from js/src/controls/FullScreenControl.js
rename to js/src/controls/FullScreenControl.ts
index c54dbf905..bdbb2d630 100644
--- a/js/src/controls/FullScreenControl.js
+++ b/js/src/controls/FullScreenControl.ts
@@ -1,9 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const control = require('./Control.js');
-
+//@ts-nocheck
+import L from '../leaflet';
+import * as control from './Control';
 export class LeafletFullScreenControlModel extends control.LeafletControlModel {
   defaults() {
     return {
@@ -21,6 +21,8 @@ export class LeafletFullScreenControlView extends control.LeafletControlView {
   }
 
   create_obj() {
+    //@ts-ignore
+
     this.obj = L.control.fullscreen(this.get_options());
   }
 }
diff --git a/js/src/controls/LayersControl.js b/js/src/controls/LayersControl.ts
similarity index 94%
rename from js/src/controls/LayersControl.js
rename to js/src/controls/LayersControl.ts
index 27668fa75..351f0327a 100644
--- a/js/src/controls/LayersControl.js
+++ b/js/src/controls/LayersControl.ts
@@ -1,8 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletLayersControlModel extends control.LeafletControlModel {
   defaults() {
@@ -56,6 +57,7 @@ export class LeafletLayersControlView extends control.LeafletControlView {
           }
           return ov;
         }, {});
+        //@ts-ignore
         this.obj = L.control.layers(baselayers, overlays, this.get_options());
         return this;
       })
diff --git a/js/src/controls/LegendControl.js b/js/src/controls/LegendControl.ts
similarity index 96%
rename from js/src/controls/LegendControl.js
rename to js/src/controls/LegendControl.ts
index 5532dc1e0..1812eb455 100644
--- a/js/src/controls/LegendControl.js
+++ b/js/src/controls/LegendControl.ts
@@ -1,6 +1,7 @@
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+// @ts-nocheck
 
+import L from '../leaflet';
+import * as control from './Control';
 export class LeafletLegendControlModel extends control.LeafletControlModel {
   defaults() {
     return {
diff --git a/js/src/controls/MeasureControl.js b/js/src/controls/MeasureControl.ts
similarity index 95%
rename from js/src/controls/MeasureControl.js
rename to js/src/controls/MeasureControl.ts
index 7d8328977..cd8b2d142 100644
--- a/js/src/controls/MeasureControl.js
+++ b/js/src/controls/MeasureControl.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletMeasureControlModel extends control.LeafletControlModel {
   defaults() {
diff --git a/js/src/controls/ScaleControl.js b/js/src/controls/ScaleControl.ts
similarity index 86%
rename from js/src/controls/ScaleControl.js
rename to js/src/controls/ScaleControl.ts
index ab10901dc..a325ee077 100644
--- a/js/src/controls/ScaleControl.js
+++ b/js/src/controls/ScaleControl.ts
@@ -1,9 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const control = require('./Control.js');
-
+//@ts-nocheck
+import L from '../leaflet';
+import * as control from './Control';
 export class LeafletScaleControlModel extends control.LeafletControlModel {
   defaults() {
     return {
@@ -21,6 +21,7 @@ export class LeafletScaleControlView extends control.LeafletControlView {
   }
 
   create_obj() {
+    //@ts-ignore
     this.obj = L.control.scale(this.get_options());
   }
 }
diff --git a/js/src/controls/SearchControl.js b/js/src/controls/SearchControl.ts
similarity index 93%
rename from js/src/controls/SearchControl.js
rename to js/src/controls/SearchControl.ts
index b761048a1..a664ce1f9 100644
--- a/js/src/controls/SearchControl.js
+++ b/js/src/controls/SearchControl.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletSearchControlModel extends control.LeafletControlModel {
   defaults() {
@@ -47,6 +48,7 @@ export class LeafletSearchControlView extends control.LeafletControlView {
       const options = this.get_options();
       options.layer = layer_view !== null ? layer_view.obj : null;
       options.marker = marker_view !== null ? marker_view.obj : false;
+      //@ts-ignore
       this.obj = L.control.search(options);
     });
   }
diff --git a/js/src/controls/SplitMapControl.js b/js/src/controls/SplitMapControl.ts
similarity index 91%
rename from js/src/controls/SplitMapControl.js
rename to js/src/controls/SplitMapControl.ts
index bdff9b9b2..010dde3ac 100644
--- a/js/src/controls/SplitMapControl.js
+++ b/js/src/controls/SplitMapControl.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletSplitMapControlModel extends control.LeafletControlModel {
   default() {
@@ -50,6 +51,7 @@ export class LeafletSplitMapControlView extends control.LeafletControlView {
           right_views.push(view.obj);
         }
       });
+      //@ts-ignore
       this.obj = L.control.splitMap(left_views, right_views);
     });
   }
diff --git a/js/src/controls/WidgetControl.js b/js/src/controls/WidgetControl.ts
similarity index 93%
rename from js/src/controls/WidgetControl.js
rename to js/src/controls/WidgetControl.ts
index aa5f48da4..bd8beca18 100644
--- a/js/src/controls/WidgetControl.js
+++ b/js/src/controls/WidgetControl.ts
@@ -1,11 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const control = require('./Control.js');
-const PMessaging = require('@lumino/messaging');
-const PWidgets = require('@lumino/widgets');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import * as PMessaging from '@lumino/messaging';
+import * as PWidgets from '@lumino/widgets';
+import L from '../leaflet';
+import * as control from './Control';
 
 class WidgetControl extends L.Control {
   updateLayout(options) {
diff --git a/js/src/controls/ZoomControl.js b/js/src/controls/ZoomControl.ts
similarity index 88%
rename from js/src/controls/ZoomControl.js
rename to js/src/controls/ZoomControl.ts
index 1b31ab099..1ddfc4517 100644
--- a/js/src/controls/ZoomControl.js
+++ b/js/src/controls/ZoomControl.ts
@@ -1,8 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const control = require('./Control.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as control from './Control';
 
 export class LeafletZoomControlModel extends control.LeafletControlModel {
   defaults() {
@@ -25,6 +26,7 @@ export class LeafletZoomControlView extends control.LeafletControlView {
   }
 
   create_obj() {
+    //@ts-ignore
     this.obj = L.control.zoom(this.get_options());
   }
 }
diff --git a/js/src/embed.js b/js/src/embed.ts
similarity index 72%
rename from js/src/embed.js
rename to js/src/embed.ts
index afc7168ad..606022536 100644
--- a/js/src/embed.js
+++ b/js/src/embed.ts
@@ -1,4 +1,4 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-module.exports = require('./index.js');
+export * from './index';
diff --git a/js/src/extension.js b/js/src/extension.ts
similarity index 72%
rename from js/src/extension.js
rename to js/src/extension.ts
index f5fa5fd8d..0e4b2807b 100644
--- a/js/src/extension.js
+++ b/js/src/extension.ts
@@ -1,5 +1,6 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+// @ts-nocheck
 
 // Configure requirejs
 if (window.require) {
@@ -12,7 +13,4 @@ if (window.require) {
   });
 }
 
-// Export the required load_ipython_extention
-module.exports = {
-  load_ipython_extension: function () {},
-};
+export const load_ipython_extension = function () {};
diff --git a/js/src/index.js b/js/src/index.ts
similarity index 76%
rename from js/src/index.js
rename to js/src/index.ts
index bb3820fcf..702137165 100644
--- a/js/src/index.js
+++ b/js/src/index.ts
@@ -1,10 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+// @ts-nocheck
+
+import packageJson from '../package.json';
 
 // Export everything from jupyter-leaflet and the npm package version number.
 var _oldL = window.L;
-module.exports = require('./jupyter-leaflet.js');
-module.exports['version'] = require('../package.json').version;
 
 // if previous L existed and it got changed while loading this module
 if (_oldL !== undefined && _oldL !== window.L) {
@@ -13,3 +14,8 @@ if (_oldL !== undefined && _oldL !== window.L) {
   );
   ipyL = L.noConflict(); // eslint-disable-line no-undef
 }
+
+const { version } = packageJson;
+
+export * from './jupyter-leaflet';
+export { version };
diff --git a/js/src/jupyter-leaflet.js b/js/src/jupyter-leaflet.js
deleted file mode 100644
index 794feac36..000000000
--- a/js/src/jupyter-leaflet.js
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright (c) Jupyter Development Team.
-// Distributed under the terms of the Modified BSD License.
-
-// Layers
-export * from './layers/Layer.js';
-export * from './layers/Marker.js';
-export * from './layers/Icon.js';
-export * from './layers/AwesomeIcon.js';
-export * from './layers/Popup.js';
-export * from './layers/RasterLayer.js';
-export * from './layers/TileLayer.js';
-export * from './layers/PMTilesLayer.js';
-export * from './layers/VectorTileLayer.js';
-export * from './layers/LocalTileLayer.js';
-export * from './layers/WMSLayer.js';
-export * from './layers/MagnifyingGlass.js';
-export * from './layers/ImageOverlay.js';
-export * from './layers/VideoOverlay.js';
-export * from './layers/ImageService.js';
-export * from './layers/Velocity.js';
-export * from './layers/Heatmap.js';
-export * from './layers/VectorLayer.js';
-export * from './layers/Path.js';
-export * from './layers/AntPath.js';
-export * from './layers/Polyline.js';
-export * from './layers/Polygon.js';
-export * from './layers/Rectangle.js';
-export * from './layers/CircleMarker.js';
-export * from './layers/Circle.js';
-export * from './layers/MarkerCluster.js';
-export * from './layers/LayerGroup.js';
-export * from './layers/FeatureGroup.js';
-export * from './layers/GeoJSON.js';
-export * from './layers/DivIcon.js';
-
-//Controls
-export * from './controls/AttributionControl.js';
-export * from './controls/Control.js';
-export * from './controls/SplitMapControl.js';
-export * from './controls/LayersControl.js';
-export * from './controls/MeasureControl.js';
-export * from './controls/DrawControl.js';
-export * from './controls/FullScreenControl.js';
-export * from './controls/WidgetControl.js';
-export * from './controls/ZoomControl.js';
-export * from './controls/ScaleControl.js';
-export * from './controls/LegendControl.js';
-export * from './controls/SearchControl.js';
-
-//Map
-export * from './Map.js';
-
-// Load css
-require('leaflet/dist/leaflet.css');
-require('leaflet-defaulticon-compatibility/dist/leaflet-defaulticon-compatibility.webpack.css'); // Re-uses images from ~leaflet package
-require('leaflet-draw/dist/leaflet.draw.css');
-require('leaflet.markercluster/dist/MarkerCluster.css');
-require('leaflet.markercluster/dist/MarkerCluster.Default.css');
-require('leaflet-measure/dist/leaflet-measure.css');
-require('leaflet-fullscreen/dist/leaflet.fullscreen.css');
-require('leaflet.awesome-markers/dist/leaflet.awesome-markers.css');
-require('spin.js/spin.css');
-require('./jupyter-leaflet.css');
-require('leaflet-search/dist/leaflet-search.src.css');
diff --git a/js/src/jupyter-leaflet.ts b/js/src/jupyter-leaflet.ts
new file mode 100644
index 000000000..21fa51192
--- /dev/null
+++ b/js/src/jupyter-leaflet.ts
@@ -0,0 +1,65 @@
+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+// Layers
+export * from './layers/AntPath';
+export * from './layers/AwesomeIcon';
+export * from './layers/Circle';
+export * from './layers/CircleMarker';
+export * from './layers/DivIcon';
+export * from './layers/FeatureGroup';
+export * from './layers/GeoJSON';
+export * from './layers/Heatmap';
+export * from './layers/Icon';
+export * from './layers/ImageOverlay';
+export * from './layers/ImageService';
+export * from './layers/Layer';
+export * from './layers/LayerGroup';
+export * from './layers/LocalTileLayer';
+export * from './layers/MagnifyingGlass';
+export * from './layers/Marker';
+export * from './layers/MarkerCluster';
+export * from './layers/PMTilesLayer';
+export * from './layers/Path';
+export * from './layers/Polygon';
+export * from './layers/Polyline';
+export * from './layers/Popup';
+export * from './layers/RasterLayer';
+export * from './layers/Rectangle';
+export * from './layers/TileLayer';
+export * from './layers/VectorLayer';
+export * from './layers/VectorTileLayer';
+export * from './layers/Velocity';
+export * from './layers/VideoOverlay';
+export * from './layers/WMSLayer';
+
+//Controls
+export * from './controls/AttributionControl';
+export * from './controls/Control';
+export * from './controls/DrawControl';
+export * from './controls/FullScreenControl';
+export * from './controls/LayersControl';
+export * from './controls/LegendControl';
+export * from './controls/MeasureControl';
+export * from './controls/ScaleControl';
+export * from './controls/SearchControl';
+export * from './controls/SplitMapControl';
+export * from './controls/WidgetControl';
+export * from './controls/ZoomControl';
+
+//Map
+export * from './Map';
+
+// Load css
+import 'leaflet-defaulticon-compatibility/dist/leaflet-defaulticon-compatibility.webpack.css';
+import 'leaflet/dist/leaflet.css';
+// Re-uses images from ~leaflet package
+import 'leaflet-draw/dist/leaflet.draw.css';
+import 'leaflet-fullscreen/dist/leaflet.fullscreen.css';
+import 'leaflet-measure/dist/leaflet-measure.css';
+import 'leaflet-search/dist/leaflet-search.src.css';
+import 'leaflet.awesome-markers/dist/leaflet.awesome-markers.css';
+import 'leaflet.markercluster/dist/MarkerCluster.Default.css';
+import 'leaflet.markercluster/dist/MarkerCluster.css';
+import 'spin.js/spin.css';
+import '../css/jupyter-leaflet.css';
diff --git a/js/src/jupyterlab-plugin.js b/js/src/jupyterlab-plugin.js
deleted file mode 100644
index 7e3defd99..000000000
--- a/js/src/jupyterlab-plugin.js
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) Jupyter Development Team.
-// Distributed under the terms of the Modified BSD License.
-
-var jupyter_leaflet = require('./index');
-
-var base = require('@jupyter-widgets/base');
-
-module.exports = {
-  id: 'jupyter.extensions.jupyter-leaflet',
-  requires: [base.IJupyterWidgetRegistry],
-  activate: function (app, widgets) {
-    widgets.registerWidget({
-      name: 'jupyter-leaflet',
-      version: jupyter_leaflet.version,
-      exports: jupyter_leaflet,
-    });
-  },
-  autoStart: true,
-};
diff --git a/js/src/jupyterlab-plugin.ts b/js/src/jupyterlab-plugin.ts
new file mode 100644
index 000000000..3d300f460
--- /dev/null
+++ b/js/src/jupyterlab-plugin.ts
@@ -0,0 +1,22 @@
+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+import { IJupyterWidgetRegistry } from '@jupyter-widgets/base';
+import packageJson from '../package.json';
+
+const { version } = packageJson;
+
+const extension = {
+  id: 'jupyter-leaflet',
+  requires: [IJupyterWidgetRegistry],
+  activate: (app: any, widgets: any) => {
+    widgets.registerWidget({
+      name: 'jupyter-leaflet',
+      version: version,
+      exports: async () => import('./index'),
+    });
+  },
+  autoStart: true,
+};
+
+export default extension;
diff --git a/js/src/layers/AntPath.js b/js/src/layers/AntPath.ts
similarity index 79%
rename from js/src/layers/AntPath.js
rename to js/src/layers/AntPath.ts
index f66108daf..c9ec5cc69 100644
--- a/js/src/layers/AntPath.js
+++ b/js/src/layers/AntPath.ts
@@ -1,9 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const L = require('../leaflet.js');
-const vectorlayer = require('./VectorLayer.js');
-const { antPath } = require('leaflet-ant-path');
+//@ts-nocheck
+import { antPath } from 'leaflet-ant-path';
+import L from '../leaflet';
+import * as vectorlayer from './VectorLayer';
 
 export class LeafletAntPathModel extends vectorlayer.LeafletVectorLayerModel {
   defaults() {
@@ -32,14 +32,9 @@ export class LeafletAntPathView extends vectorlayer.LeafletVectorLayerView {
 
   model_events() {
     super.model_events();
-    this.listenTo(
-      this.model,
-      'change:locations',
-      function () {
-        this.obj.setLatLngs(this.model.get('locations'));
-      },
-      this
-    );
+    this.listenTo(this.model, 'change:locations', function () {
+      this.obj.setLatLngs(this.model.get('locations'));
+    });
     this.model.on_some_change(this.model.get('options'), () => {
       this.obj.setStyle(this.get_ant_options());
     });
diff --git a/js/src/layers/AwesomeIcon.js b/js/src/layers/AwesomeIcon.ts
similarity index 90%
rename from js/src/layers/AwesomeIcon.js
rename to js/src/layers/AwesomeIcon.ts
index 606b70bb1..0f0b8d419 100644
--- a/js/src/layers/AwesomeIcon.js
+++ b/js/src/layers/AwesomeIcon.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
+import L from '../leaflet';
+import * as layer from './Layer';
 
 export class LeafletAwesomeIconModel extends layer.LeafletUILayerModel {
   defaults() {
@@ -20,6 +20,7 @@ export class LeafletAwesomeIconModel extends layer.LeafletUILayerModel {
 
 export class LeafletAwesomeIconView extends layer.LeafletUILayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.AwesomeMarkers.icon({
       prefix: 'fa',
       icon: this.model.get('name'),
diff --git a/js/src/layers/Circle.js b/js/src/layers/Circle.ts
similarity index 88%
rename from js/src/layers/Circle.js
rename to js/src/layers/Circle.ts
index 437109291..d86d62b88 100644
--- a/js/src/layers/Circle.js
+++ b/js/src/layers/Circle.ts
@@ -1,8 +1,9 @@
 // Copyright (c) Jupyter Development Team.
+//@ts-nocheck
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const circlemarker = require('./CircleMarker.js');
+import L from '../leaflet';
+import * as circlemarker from './CircleMarker';
 
 export class LeafletCircleModel extends circlemarker.LeafletCircleMarkerModel {
   defaults() {
@@ -16,6 +17,7 @@ export class LeafletCircleModel extends circlemarker.LeafletCircleMarkerModel {
 
 export class LeafletCircleView extends circlemarker.LeafletCircleMarkerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.circle(this.model.get('location'), this.get_options());
   }
 
diff --git a/js/src/layers/CircleMarker.js b/js/src/layers/CircleMarker.ts
similarity index 89%
rename from js/src/layers/CircleMarker.js
rename to js/src/layers/CircleMarker.ts
index 813c7f9c5..4270a5663 100644
--- a/js/src/layers/CircleMarker.js
+++ b/js/src/layers/CircleMarker.ts
@@ -1,8 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+//@ts-nocheck
 
-const L = require('../leaflet.js');
-const path = require('./Path.js');
+import L from '../leaflet';
+import * as path from './Path';
 
 const DEFAULT_LOCATION = [0.0, 0.0];
 
@@ -19,6 +20,7 @@ export class LeafletCircleMarkerModel extends path.LeafletPathModel {
 
 export class LeafletCircleMarkerView extends path.LeafletPathView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.circleMarker(this.model.get('location'), this.get_options());
   }
 
diff --git a/js/src/layers/DivIcon.js b/js/src/layers/DivIcon.ts
similarity index 87%
rename from js/src/layers/DivIcon.js
rename to js/src/layers/DivIcon.ts
index fcd1f437e..457dd6c9f 100644
--- a/js/src/layers/DivIcon.js
+++ b/js/src/layers/DivIcon.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
+import L from '../leaflet';
+import * as layer from './Layer';
 
 export class LeafletDivIconModel extends layer.LeafletUILayerModel {
   defaults() {
@@ -21,6 +21,7 @@ export class LeafletDivIconModel extends layer.LeafletUILayerModel {
 
 export class LeafletDivIconView extends layer.LeafletUILayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.divIcon(this.get_options());
   }
 }
diff --git a/js/src/layers/FeatureGroup.js b/js/src/layers/FeatureGroup.ts
similarity index 84%
rename from js/src/layers/FeatureGroup.js
rename to js/src/layers/FeatureGroup.ts
index 023d64668..e77d6035e 100644
--- a/js/src/layers/FeatureGroup.js
+++ b/js/src/layers/FeatureGroup.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const layergroup = require('./LayerGroup.js');
+import L from '../leaflet';
+import * as layergroup from './LayerGroup';
 
 export class LeafletFeatureGroupModel extends layergroup.LeafletLayerGroupModel {
   defaults() {
@@ -16,6 +16,7 @@ export class LeafletFeatureGroupModel extends layergroup.LeafletLayerGroupModel
 
 export class LeafletFeatureGroupView extends layergroup.LeafletLayerGroupView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.featureGroup();
   }
 }
diff --git a/js/src/layers/GeoJSON.js b/js/src/layers/GeoJSON.ts
similarity index 96%
rename from js/src/layers/GeoJSON.js
rename to js/src/layers/GeoJSON.ts
index 36546e1a9..0b28544e5 100644
--- a/js/src/layers/GeoJSON.js
+++ b/js/src/layers/GeoJSON.ts
@@ -1,8 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+// @ts-nocheck
 
-const L = require('../leaflet.js');
-const featuregroup = require('./FeatureGroup.js');
+import L from '../leaflet';
+
+import * as featuregroup from './FeatureGroup';
 
 export class LeafletGeoJSONModel extends featuregroup.LeafletFeatureGroupModel {
   defaults() {
diff --git a/js/src/layers/Heatmap.js b/js/src/layers/Heatmap.ts
similarity index 87%
rename from js/src/layers/Heatmap.js
rename to js/src/layers/Heatmap.ts
index 86b342932..db08f2708 100644
--- a/js/src/layers/Heatmap.js
+++ b/js/src/layers/Heatmap.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const rasterlayer = require('./RasterLayer.js');
-const layer = require('./Layer.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as layer from './Layer';
+import * as rasterlayer from './RasterLayer';
 
 export class LeafletHeatmapModel extends rasterlayer.LeafletRasterLayerModel {
   defaults() {
@@ -30,6 +31,7 @@ export class LeafletHeatmapModel extends rasterlayer.LeafletRasterLayerModel {
 
 export class LeafletHeatmapView extends layer.LeafletLayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.heatLayer(this.model.get('locations'), this.get_options());
   }
 
diff --git a/js/src/layers/Icon.js b/js/src/layers/Icon.ts
similarity index 88%
rename from js/src/layers/Icon.js
rename to js/src/layers/Icon.ts
index fb5af6022..3de24ca7e 100644
--- a/js/src/layers/Icon.js
+++ b/js/src/layers/Icon.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
+import L from '../leaflet';
+import * as layer from './Layer';
 
 export class LeafletIconModel extends layer.LeafletUILayerModel {
   defaults() {
@@ -23,6 +23,7 @@ export class LeafletIconModel extends layer.LeafletUILayerModel {
 
 export class LeafletIconView extends layer.LeafletUILayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.icon(this.get_options());
   }
 }
diff --git a/js/src/layers/ImageOverlay.js b/js/src/layers/ImageOverlay.ts
similarity index 91%
rename from js/src/layers/ImageOverlay.js
rename to js/src/layers/ImageOverlay.ts
index db8dc6a8a..270bd186b 100644
--- a/js/src/layers/ImageOverlay.js
+++ b/js/src/layers/ImageOverlay.ts
@@ -1,8 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const rasterlayer = require('./RasterLayer.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as rasterlayer from './RasterLayer';
 
 const DEFAULT_LOCATION = [0.0, 0.0];
 
@@ -21,6 +22,7 @@ export class LeafletImageOverlayModel extends rasterlayer.LeafletRasterLayerMode
 
 export class LeafletImageOverlayView extends rasterlayer.LeafletRasterLayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.imageOverlay(
       this.model.get('url'),
       this.model.get('bounds'),
diff --git a/js/src/layers/ImageService.js b/js/src/layers/ImageService.ts
similarity index 88%
rename from js/src/layers/ImageService.js
rename to js/src/layers/ImageService.ts
index 982d0dc57..f3b0d440e 100644
--- a/js/src/layers/ImageService.js
+++ b/js/src/layers/ImageService.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
-const proj = require('../projections.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as proj from '../projections';
+import * as layer from './Layer';
 
 export class LeafletImageServiceModel extends layer.LeafletLayerModel {
   defaults() {
@@ -27,13 +28,14 @@ export class LeafletImageServiceModel extends layer.LeafletLayerModel {
       attribution: '',
       crs: null,
       interactive: false,
-      updateInterval: 200
+      updateInterval: 200,
     };
   }
 }
 
 export class LeafletImageServiceView extends layer.LeafletLayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.imageService({
       url: this.model.get('url'),
       ...this.get_options(),
diff --git a/js/src/layers/Layer.js b/js/src/layers/Layer.ts
similarity index 96%
rename from js/src/layers/Layer.js
rename to js/src/layers/Layer.ts
index a5264db16..db6218b0b 100644
--- a/js/src/layers/Layer.js
+++ b/js/src/layers/Layer.ts
@@ -1,11 +1,12 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+//@ts-nocheck
 
-const widgets = require('@jupyter-widgets/base');
-const PMessaging = require('@lumino/messaging');
-const PWidgets = require('@lumino/widgets');
-const L = require('../leaflet.js');
-const utils = require('../utils.js');
+import * as widgets from '@jupyter-widgets/base';
+import * as PMessaging from '@lumino/messaging';
+import * as PWidgets from '@lumino/widgets';
+import L from '../leaflet';
+import * as utils from '../utils';
 
 export class LeafletLayerModel extends widgets.WidgetModel {
   defaults() {
diff --git a/js/src/layers/LayerGroup.js b/js/src/layers/LayerGroup.ts
similarity index 90%
rename from js/src/layers/LayerGroup.js
rename to js/src/layers/LayerGroup.ts
index 0bae017e6..681944e10 100644
--- a/js/src/layers/LayerGroup.js
+++ b/js/src/layers/LayerGroup.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+//@ts-nocheck
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as layer from './Layer';
 
 export class LeafletLayerGroupModel extends layer.LeafletLayerModel {
   defaults() {
diff --git a/js/src/layers/LocalTileLayer.js b/js/src/layers/LocalTileLayer.ts
similarity index 92%
rename from js/src/layers/LocalTileLayer.js
rename to js/src/layers/LocalTileLayer.ts
index d29057b9d..61eced273 100644
--- a/js/src/layers/LocalTileLayer.js
+++ b/js/src/layers/LocalTileLayer.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const tilelayer = require('./TileLayer.js');
+import * as tilelayer from './TileLayer';
 
 export class LeafletLocalTileLayerModel extends tilelayer.LeafletTileLayerModel {
   defaults() {
diff --git a/js/src/layers/MagnifyingGlass.js b/js/src/layers/MagnifyingGlass.ts
similarity index 90%
rename from js/src/layers/MagnifyingGlass.js
rename to js/src/layers/MagnifyingGlass.ts
index 46b93a840..1d12e6499 100644
--- a/js/src/layers/MagnifyingGlass.js
+++ b/js/src/layers/MagnifyingGlass.ts
@@ -1,10 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const rasterlayer = require('./RasterLayer.js');
-const layer = require('./Layer.js');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as layer from './Layer';
+import * as rasterlayer from './RasterLayer';
 
 export class LeafletMagnifyingGlassModel extends rasterlayer.LeafletRasterLayerModel {
   defaults() {
@@ -48,6 +49,7 @@ export class LeafletMagnifyingGlassView extends layer.LeafletLayerView {
     return this.layer_views.update(layers).then((layers) => {
       var options = this.get_options();
       options.layers = layers;
+      //@ts-ignore
       this.obj = L.magnifyingGlass(options);
     });
   }
diff --git a/js/src/layers/Marker.js b/js/src/layers/Marker.ts
similarity index 96%
rename from js/src/layers/Marker.js
rename to js/src/layers/Marker.ts
index 6571ca874..b50502f2e 100644
--- a/js/src/layers/Marker.js
+++ b/js/src/layers/Marker.ts
@@ -1,9 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as layer from './Layer';
 
 const DEFAULT_LOCATION = [0.0, 0.0];
 
diff --git a/js/src/layers/MarkerCluster.js b/js/src/layers/MarkerCluster.ts
similarity index 92%
rename from js/src/layers/MarkerCluster.js
rename to js/src/layers/MarkerCluster.ts
index 4f37d1ade..41e844ed9 100644
--- a/js/src/layers/MarkerCluster.js
+++ b/js/src/layers/MarkerCluster.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import L from '../leaflet';
+import * as layer from './Layer';
 
 export class LeafletMarkerClusterModel extends layer.LeafletLayerModel {
   defaults() {
@@ -35,7 +36,7 @@ export class LeafletMarkerClusterModel extends layer.LeafletLayerModel {
     };
   }
 }
-
+//@ts-ignore
 LeafletMarkerClusterModel.serializers = {
   ...widgets.WidgetModel.serializers,
   markers: { deserialize: widgets.unpack_models },
@@ -70,6 +71,7 @@ export class LeafletMarkerClusterView extends layer.LeafletLayerView {
 
   create_obj() {
     var options = this.get_options();
+    //@ts-ignore
     this.obj = L.markerClusterGroup(options);
     this.marker_views = new widgets.ViewList(
       this.add_layer_model,
diff --git a/js/src/layers/PMTilesLayer.js b/js/src/layers/PMTilesLayer.js
deleted file mode 100644
index 45696fff5..000000000
--- a/js/src/layers/PMTilesLayer.js
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) Jupyter Development Team.
-// Distributed under the terms of the Modified BSD License.
-
-const layer = require('./Layer.js');
-const protomapsL = require('protomaps-leaflet');
-
-export class LeafletPMTilesLayerModel extends layer.LeafletLayerModel {
-    defaults() {
-        return {
-            ...super.defaults(),
-            _view_name: 'LeafletPMTilesLayerView',
-            _model_name: 'LeafletPMTilesLayerModel',
-            url: '',
-            attribution: '',
-            style: {},
-        };
-    }
-}
-
-export class LeafletPMTilesLayerView extends layer.LeafletLayerView {
-    create_obj() {
-      var options = {
-        ...this.get_options(),
-        url: this.model.get('url'),
-        ...protomapsL.json_style(this.model.get('style')),
-      };
-      this.obj = protomapsL.leafletLayer(options);
-      }
-    
-      model_events() {
-        super.model_events();
-        this.listenTo(
-          this.model,
-          'change:url',
-          function () {
-            this.obj.setUrl(this.model.get('url'));
-          },
-          this
-        );
-      }
-
-      handle_message(content) {
-        if (content.msg == 'add_inspector') {
-          this.obj.addInspector(this.map_view.obj);
-        }
-      }
-    }
-    
\ No newline at end of file
diff --git a/js/src/layers/PMTilesLayer.ts b/js/src/layers/PMTilesLayer.ts
new file mode 100644
index 000000000..503256082
--- /dev/null
+++ b/js/src/layers/PMTilesLayer.ts
@@ -0,0 +1,49 @@
+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+//@ts-nocheck
+import * as layer from './Layer';
+import * as protomapsL from 'protomaps-leaflet';
+
+export class LeafletPMTilesLayerModel extends layer.LeafletLayerModel {
+  defaults() {
+    return {
+      ...super.defaults(),
+      _view_name: 'LeafletPMTilesLayerView',
+      _model_name: 'LeafletPMTilesLayerModel',
+      url: '',
+      attribution: '',
+      style: {},
+    };
+  }
+}
+
+export class LeafletPMTilesLayerView extends layer.LeafletLayerView {
+  create_obj() {
+    var options = {
+      ...this.get_options(),
+      url: this.model.get('url'),
+      //@ts-ignore
+      ...protomapsL.json_style(this.model.get('style')),
+    };
+    this.obj = protomapsL.leafletLayer(options);
+  }
+
+  model_events() {
+    super.model_events();
+    this.listenTo(
+      this.model,
+      'change:url',
+      function () {
+        this.obj.setUrl(this.model.get('url'));
+      },
+      this
+    );
+  }
+
+  handle_message(content) {
+    if (content.msg == 'add_inspector') {
+      this.obj.addInspector(this.map_view.obj);
+    }
+  }
+}
diff --git a/js/src/layers/Path.js b/js/src/layers/Path.ts
similarity index 94%
rename from js/src/layers/Path.js
rename to js/src/layers/Path.ts
index f62fa8d09..bd36e356f 100644
--- a/js/src/layers/Path.js
+++ b/js/src/layers/Path.ts
@@ -1,7 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const vectorlayer = require('./VectorLayer.js');
+//@ts-nocheck
+import * as vectorlayer from './VectorLayer';
 
 export class LeafletPathModel extends vectorlayer.LeafletVectorLayerModel {
   defaults() {
diff --git a/js/src/layers/Polygon.js b/js/src/layers/Polygon.ts
similarity index 85%
rename from js/src/layers/Polygon.js
rename to js/src/layers/Polygon.ts
index 08a76d338..043fcd3ba 100644
--- a/js/src/layers/Polygon.js
+++ b/js/src/layers/Polygon.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-var L = require('../leaflet.js');
-var polyline = require('./Polyline.js');
+import L from '../leaflet';
+import * as polyline from './Polyline';
 
 export class LeafletPolygonModel extends polyline.LeafletPolylineModel {
   defaults() {
@@ -16,6 +16,7 @@ export class LeafletPolygonModel extends polyline.LeafletPolylineModel {
 
 export class LeafletPolygonView extends polyline.LeafletPolylineView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.polygon(this.model.get('locations'), this.get_options());
   }
 }
diff --git a/js/src/layers/Polyline.js b/js/src/layers/Polyline.ts
similarity index 96%
rename from js/src/layers/Polyline.js
rename to js/src/layers/Polyline.ts
index de9db7e16..130a1f332 100644
--- a/js/src/layers/Polyline.js
+++ b/js/src/layers/Polyline.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const L = require('../leaflet.js');
-const path = require('./Path.js');
+//@ts-nocheck
+import L from '../leaflet';
+import * as path from './Path';
 
 export class LeafletPolylineModel extends path.LeafletPathModel {
   defaults() {
diff --git a/js/src/layers/Popup.js b/js/src/layers/Popup.ts
similarity index 92%
rename from js/src/layers/Popup.js
rename to js/src/layers/Popup.ts
index 53974859f..067203694 100644
--- a/js/src/layers/Popup.js
+++ b/js/src/layers/Popup.ts
@@ -1,11 +1,12 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
-const PMessaging = require('@lumino/messaging');
-const PWidgets = require('@lumino/widgets');
+//@ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
+import * as PMessaging from '@lumino/messaging';
+import * as PWidgets from '@lumino/widgets';
+import L from '../leaflet';
+import * as layer from './Layer';
 
 const DEFAULT_LOCATION = [0.0, 0.0];
 
@@ -31,6 +32,7 @@ LeafletPopupModel.serializers = {
 
 export class LeafletPopupView extends layer.LeafletUILayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.popup(this.get_options()).setLatLng(
       this.model.get('location')
     );
@@ -102,6 +104,7 @@ export class LeafletPopupView extends layer.LeafletUILayerView {
   }
 
   update_popup() {
+    //@ts-ignore
     L.setOptions(this.obj, this.get_options());
     this.force_update();
   }
diff --git a/js/src/layers/RasterLayer.js b/js/src/layers/RasterLayer.ts
similarity index 95%
rename from js/src/layers/RasterLayer.js
rename to js/src/layers/RasterLayer.ts
index a6c3c94d4..ede244804 100644
--- a/js/src/layers/RasterLayer.js
+++ b/js/src/layers/RasterLayer.ts
@@ -1,7 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const layer = require('./Layer.js');
+//@ts-nocheck
+import * as layer from './Layer';
 
 export class LeafletRasterLayerModel extends layer.LeafletLayerModel {
   defaults() {
diff --git a/js/src/layers/Rectangle.js b/js/src/layers/Rectangle.ts
similarity index 86%
rename from js/src/layers/Rectangle.js
rename to js/src/layers/Rectangle.ts
index 0a5a74345..c01131485 100644
--- a/js/src/layers/Rectangle.js
+++ b/js/src/layers/Rectangle.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const polygon = require('./Polygon.js');
+import L from '../leaflet';
+import * as polygon from './Polygon';
 
 export class LeafletRectangleModel extends polygon.LeafletPolygonModel {
   defaults() {
@@ -17,6 +17,7 @@ export class LeafletRectangleModel extends polygon.LeafletPolygonModel {
 
 export class LeafletRectangleView extends polygon.LeafletPolygonView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.rectangle(this.model.get('bounds'), this.get_options());
   }
 }
diff --git a/js/src/layers/TileLayer.js b/js/src/layers/TileLayer.ts
similarity index 93%
rename from js/src/layers/TileLayer.js
rename to js/src/layers/TileLayer.ts
index b32925c66..522438ab6 100644
--- a/js/src/layers/TileLayer.js
+++ b/js/src/layers/TileLayer.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const rasterlayer = require('./RasterLayer.js');
-const Spinner = require('spin.js').Spinner;
+//@ts-nocheck
+import { Spinner } from 'spin.js';
+import L from '../leaflet';
+import * as rasterlayer from './RasterLayer';
 
 export class LeafletTileLayerModel extends rasterlayer.LeafletRasterLayerModel {
   defaults() {
@@ -32,6 +33,7 @@ export class LeafletTileLayerModel extends rasterlayer.LeafletRasterLayerModel {
 
 export class LeafletTileLayerView extends rasterlayer.LeafletRasterLayerView {
   create_obj() {
+    //@ts-ignore
     this.obj = L.tileLayer(this.model.get('url'), this.get_options());
     this.model.on('msg:custom', this.handle_message.bind(this));
   }
diff --git a/js/src/layers/VectorLayer.js b/js/src/layers/VectorLayer.ts
similarity index 91%
rename from js/src/layers/VectorLayer.js
rename to js/src/layers/VectorLayer.ts
index 8e63d7689..c6d389ce2 100644
--- a/js/src/layers/VectorLayer.js
+++ b/js/src/layers/VectorLayer.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const layer = require('./Layer.js');
+import * as layer from './Layer';
 
 export class LeafletVectorLayerModel extends layer.LeafletLayerModel {
   defaults() {
diff --git a/js/src/layers/VectorTileLayer.js b/js/src/layers/VectorTileLayer.ts
similarity index 95%
rename from js/src/layers/VectorTileLayer.js
rename to js/src/layers/VectorTileLayer.ts
index 1d459cb18..059b48102 100644
--- a/js/src/layers/VectorTileLayer.js
+++ b/js/src/layers/VectorTileLayer.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const layer = require('./Layer.js');
+//@ts-nocheck
+import * as layer from './Layer';
 
 export class LeafletVectorTileLayerModel extends layer.LeafletLayerModel {
   defaults() {
diff --git a/js/src/layers/Velocity.js b/js/src/layers/Velocity.ts
similarity index 90%
rename from js/src/layers/Velocity.js
rename to js/src/layers/Velocity.ts
index 30663d37c..2a6b08b91 100644
--- a/js/src/layers/Velocity.js
+++ b/js/src/layers/Velocity.ts
@@ -1,9 +1,10 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const layer = require('./Layer.js');
-const utils = require('../utils');
+//@ts-nocheck
+import L from '../leaflet';
+import * as utils from '../utils';
+import * as layer from './Layer';
 
 export class LeafletVelocityModel extends layer.LeafletLayerModel {
   defaults() {
@@ -34,6 +35,7 @@ export class LeafletVelocityView extends layer.LeafletLayerView {
   create_obj() {
     var options = this.get_options();
     options.data = this.model.get('data');
+    //@ts-ignore
     this.obj = L.velocityLayer(options);
   }
 
@@ -55,7 +57,9 @@ export class LeafletVelocityView extends layer.LeafletLayerView {
       'change:' + key,
       function () {
         var options = {};
+        //@ts-ignore
         options[utils.camel_case(key)] = { ...this.model.get(key) };
+        //@ts-ignore
         L.setOptions(this.obj, options);
       },
       this
diff --git a/js/src/layers/VideoOverlay.js b/js/src/layers/VideoOverlay.ts
similarity index 96%
rename from js/src/layers/VideoOverlay.js
rename to js/src/layers/VideoOverlay.ts
index 4f67f25f0..87dd28c4b 100644
--- a/js/src/layers/VideoOverlay.js
+++ b/js/src/layers/VideoOverlay.ts
@@ -1,8 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
-const L = require('../leaflet.js');
-const rasterlayer = require('./RasterLayer.js');
+//@ts-nocheck
+import * as L from '../leaflet';
+import * as rasterlayer from './RasterLayer';
 
 const DEFAULT_LOCATION = [0.0, 0.0];
 
diff --git a/js/src/layers/WMSLayer.js b/js/src/layers/WMSLayer.ts
similarity index 88%
rename from js/src/layers/WMSLayer.js
rename to js/src/layers/WMSLayer.ts
index e12a9740b..1b6a1ac47 100644
--- a/js/src/layers/WMSLayer.js
+++ b/js/src/layers/WMSLayer.ts
@@ -1,9 +1,11 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const L = require('../leaflet.js');
-const tilelayer = require('./TileLayer.js');
-const proj = require('../projections.js');
+//@ts-nocheck
+
+import L from '../leaflet';
+import * as proj from '../projections';
+import * as tilelayer from './TileLayer';
 
 export class LeafletWMSLayerModel extends tilelayer.LeafletTileLayerModel {
   defaults() {
diff --git a/js/src/leaflet-heat.js b/js/src/leaflet-heat.ts
similarity index 99%
rename from js/src/leaflet-heat.js
rename to js/src/leaflet-heat.ts
index a6e1be593..57ecc65a1 100644
--- a/js/src/leaflet-heat.js
+++ b/js/src/leaflet-heat.ts
@@ -25,6 +25,7 @@
 // TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// @ts-nocheck
 'use strict';
 
 function simpleheat(canvas) {
diff --git a/js/src/leaflet-imageservice.js b/js/src/leaflet-imageservice.ts
similarity index 90%
rename from js/src/leaflet-imageservice.js
rename to js/src/leaflet-imageservice.ts
index 67ccfab13..32ea458a8 100644
--- a/js/src/leaflet-imageservice.js
+++ b/js/src/leaflet-imageservice.ts
@@ -1,6 +1,6 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-
+//@ts-nocheck
 L.ImageService = L.Layer.extend({
   options: {
     url: '',
@@ -19,14 +19,14 @@ L.ImageService = L.Layer.extend({
     attribution: '',
     crs: null,
     interactive: false,
-    updateInterval: 200
+    updateInterval: 200,
   },
 
   initialize: function (options) {
     L.Util.setOptions(this, options);
   },
 
-  updateUrl: function() {
+  updateUrl: function () {
     // update the url for the current bounds
     if (this.options.endpoint === 'Esri') {
       this._url = this.options.url + '/exportImage' + this._buildParams();
@@ -45,7 +45,7 @@ L.ImageService = L.Layer.extend({
       this._initImage();
     }
     this._map.on('moveend', () => {
-      L.Util.throttle(this._update(),this.options.updateInterval,this);
+      L.Util.throttle(this._update(), this.options.updateInterval, this);
     });
     if (this.options.interactive) {
       L.DomUtil.addClass(this._image, 'leaflet-interactive');
@@ -94,7 +94,7 @@ L.ImageService = L.Layer.extend({
   getEvents: function () {
     var events = {
       zoom: this._reset,
-      viewreset: this._reset
+      viewreset: this._reset,
     };
     return events;
   },
@@ -104,7 +104,7 @@ L.ImageService = L.Layer.extend({
     return this._bounds;
   },
 
-  toLatLngBounds: function(a, b) {
+  toLatLngBounds: function (a, b) {
     // convert bounds to LatLngBounds object
     if (a instanceof L.LatLngBounds) {
       return a;
@@ -122,7 +122,7 @@ L.ImageService = L.Layer.extend({
     return this._bounds.getCenter();
   },
 
-  _getBBox: function() {
+  _getBBox: function () {
     // get the bounding box of the current map formatted for exportImage
     var pixelbounds = this._map.getPixelBounds();
     var sw = this._map.unproject(pixelbounds.getBottomLeft());
@@ -131,37 +131,39 @@ L.ImageService = L.Layer.extend({
       this._map.options.crs.project(ne).x,
       this._map.options.crs.project(ne).y,
       this._map.options.crs.project(sw).x,
-      this._map.options.crs.project(sw).y
+      this._map.options.crs.project(sw).y,
     ];
   },
 
-  _getBounds: function() {
+  _getBounds: function () {
     // get the bounds of the current map
-    return [[this._map.getBounds().getSouth(),this._map.getBounds().getWest()],
-      [this._map.getBounds().getNorth(),this._map.getBounds().getEast()]];
+    return [
+      [this._map.getBounds().getSouth(), this._map.getBounds().getWest()],
+      [this._map.getBounds().getNorth(), this._map.getBounds().getEast()],
+    ];
   },
 
-  _getSize: function() {
+  _getSize: function () {
     // get the size of the current map
     var size = this._map.getSize();
     return [size.x, size.y];
   },
 
-  _getEPSG: function() {
+  _getEPSG: function () {
     // get the EPSG code (numeric) of the current map
     var epsg = this.options.crs.code;
     var spatial_reference = parseInt(epsg.split(':')[1], 10);
     return spatial_reference;
   },
 
-  _getTime: function() {
+  _getTime: function () {
     // get start and end times and convert to seconds since epoch
     var st = new Date(this.options.time[0]).getTime().valueOf();
     var et = new Date(this.options.time[1]).getTime().valueOf();
     return [st, et];
   },
 
-  _buildParams: function() {
+  _buildParams: function () {
     // parameters for image server query
     var params = {
       bbox: this._getBBox().join(','),
@@ -209,7 +211,7 @@ L.ImageService = L.Layer.extend({
 
   _initImage: function () {
     var wasElementSupplied = this._url.tagName === 'IMG';
-    var img = this._image = L.DomUtil.create('img');
+    var img = (this._image = L.DomUtil.create('img'));
     L.DomUtil.addClass(img, 'leaflet-image-layer');
     img.onselectstart = L.Util.falseFn;
     img.onmousemove = L.Util.falseFn;
@@ -224,12 +226,13 @@ L.ImageService = L.Layer.extend({
   _reset: function () {
     var img = this._image;
     var size = this._getSize();
-    img.style.width  = size[0] + 'px';
+    img.style.width = size[0] + 'px';
     img.style.height = size[1] + 'px';
     if (this._getEPSG() === 3857) {
       var bounds = new L.Bounds(
         this._map.latLngToLayerPoint(this._bounds.getNorthWest()),
-        this._map.latLngToLayerPoint(this._bounds.getSouthEast()));
+        this._map.latLngToLayerPoint(this._bounds.getSouthEast())
+      );
       L.DomUtil.setPosition(img, bounds.min);
     } else {
       var pixelorigin = this._topLeft.subtract(this._map.getPixelOrigin());
@@ -246,14 +249,13 @@ L.ImageService = L.Layer.extend({
       return;
     }
     // update the url for the current bounds
-    this.updateUrl()
+    this.updateUrl();
     // update image source
     if (this._image && this._map) {
       this._image.src = this._url;
       this._reset();
     }
   },
-
 });
 
 L.imageService = function (options) {
diff --git a/js/src/leaflet-magnifyingglass.js b/js/src/leaflet-magnifyingglass.ts
similarity index 99%
rename from js/src/leaflet-magnifyingglass.js
rename to js/src/leaflet-magnifyingglass.ts
index ec793d3bf..e1a3f4df4 100644
--- a/js/src/leaflet-magnifyingglass.js
+++ b/js/src/leaflet-magnifyingglass.ts
@@ -1,5 +1,6 @@
 // The code below was copied from the following source:
 // https://github.com/bbecquet/Leaflet.MagnifyingGlass
+//@ts-nocheck
 
 L.MagnifyingGlass = L.Layer.extend({
   options: {
diff --git a/js/src/leaflet.js b/js/src/leaflet.ts
similarity index 59%
rename from js/src/leaflet.js
rename to js/src/leaflet.ts
index ac7ad8d14..4be7a5eb0 100644
--- a/js/src/leaflet.js
+++ b/js/src/leaflet.ts
@@ -1,26 +1,28 @@
-const L = require('leaflet');
-require('proj4');
-require('proj4leaflet');
-require('leaflet-defaulticon-compatibility');
-require('leaflet.vectorgrid');
-require('leaflet-splitmap');
-require('leaflet-draw');
-require('leaflet.markercluster');
-require('leaflet-velocity');
-require('leaflet-measure');
-require('./leaflet-heat.js');
-require('./leaflet-imageservice.js');
-require('./leaflet-magnifyingglass.js');
-require('leaflet-rotatedmarker');
-require('leaflet-fullscreen');
-require('leaflet-transform');
-require('leaflet.awesome-markers');
-require('leaflet-search');
-require('protomaps-leaflet');
+// const L = require('leaflet');
+//@ts-nocheck
+import L from 'leaflet';
+import 'leaflet-defaulticon-compatibility';
+import 'leaflet-draw';
+import 'leaflet-fullscreen';
+import 'leaflet-measure';
+import 'leaflet-rotatedmarker';
+import 'leaflet-search';
+import 'leaflet-splitmap';
+import 'leaflet-transform';
+import 'leaflet-velocity';
+import 'leaflet.awesome-markers';
+import 'leaflet.markercluster';
+import 'leaflet.vectorgrid';
+import 'proj4';
+import 'proj4leaflet';
+import 'protomaps-leaflet';
+import './leaflet-heat';
+import './leaflet-imageservice';
+import './leaflet-magnifyingglass';
 
 // Monkey patch GridLayer for smoother URL updates
-L.patchGridLayer = function (layer) {
-  layer._refreshTileUrl = function (tile, url) {
+L.patchGridLayer = function (layer: any) {
+  layer._refreshTileUrl = function (tile: any, url: any) {
     //use a image in background, so that only replace the actual tile, once image is loaded in cache!
     var img = new Image();
     img.onload = function () {
@@ -50,6 +52,7 @@ L.patchGridLayer = function (layer) {
 
     if (wasAnimated) {
       setTimeout(function () {
+        //@ts-ignore
         this._map._fadeAnimated = wasAnimated;
       }, 5000);
     }
@@ -57,16 +60,16 @@ L.patchGridLayer = function (layer) {
 };
 
 var oldTileLayer = L.tileLayer;
-L.tileLayer = function (url, options) {
+L.tileLayer = function (url: any, options: any) {
   var obj = oldTileLayer(url, options);
   L.patchGridLayer(obj);
   return obj;
 };
 
-L.tileLayer.wms = function (url, options) {
+L.tileLayer.wms = function (url: any, options: any) {
   var obj = oldTileLayer.wms(url, options);
   L.patchGridLayer(obj);
   return obj;
 };
 
-module.exports = L;
+export default L;
diff --git a/js/src/notebook.js b/js/src/notebook.ts
similarity index 72%
rename from js/src/notebook.js
rename to js/src/notebook.ts
index afc7168ad..606022536 100644
--- a/js/src/notebook.js
+++ b/js/src/notebook.ts
@@ -1,4 +1,4 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-module.exports = require('./index.js');
+export * from './index';
diff --git a/js/src/projections.js b/js/src/projections.ts
similarity index 74%
rename from js/src/projections.js
rename to js/src/projections.ts
index 35b74f38f..61f128503 100644
--- a/js/src/projections.js
+++ b/js/src/projections.ts
@@ -1,6 +1,7 @@
-const L = require('./leaflet.js');
+//@ts-nocheck
+import L from './leaflet';
 
-export function getProjection(proj) {
+export function getProjection(proj: any) {
   if (proj.custom === false) {
     return L.CRS[proj.name];
   } else {
diff --git a/js/src/utils.js b/js/src/utils.ts
similarity index 94%
rename from js/src/utils.js
rename to js/src/utils.ts
index 4292ebf0e..fbb25bbb7 100644
--- a/js/src/utils.js
+++ b/js/src/utils.ts
@@ -1,7 +1,8 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-const widgets = require('@jupyter-widgets/base');
+// @ts-nocheck
+import * as widgets from '@jupyter-widgets/base';
 
 function camel_case(input) {
   // Convert from foo_bar to fooBar
diff --git a/js/tsconfig.json b/js/tsconfig.json
new file mode 100644
index 000000000..e1af2221e
--- /dev/null
+++ b/js/tsconfig.json
@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "esModuleInterop": true,
+    "lib": ["es2015", "dom"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "noEmitOnError": false,
+    "noUnusedLocals": false,
+    "outDir": "lib",
+    "resolveJsonModule": true,
+    "rootDir": "src",
+    "skipLibCheck": true,
+    "sourceMap": true,
+    "strict": false,
+    "strictPropertyInitialization": false,
+    "target": "es2015",
+    "noImplicitAny": false,
+    "types": ["node", "webpack-env"]
+  },
+  "exclude": ["src/**/__tests__", "lib/**"]
+}
diff --git a/js/webpack.config.js b/js/webpack.config.js
index 1035e4c46..c95e2ff7d 100644
--- a/js/webpack.config.js
+++ b/js/webpack.config.js
@@ -7,11 +7,15 @@ crypto.createHash = (algorithm) =>
   cryptoOrigCreateHash(algorithm == 'md4' ? 'sha256' : algorithm);
 
 var rules = [
+  { test: /\.ts$/, loader: 'ts-loader' },
+  { test: /\.js$/, loader: 'source-map-loader' },
   { test: /\.css$/, use: ['style-loader', 'css-loader'] },
   { test: /\.(jpg|png|gif|svg)$/i, type: 'asset' },
 ];
 
 var resolve = {
+  // Add '.ts' and '.tsx' as resolvable extensions.
+  extensions: ['.webpack.js', '.web.js', '.ts', '.js'],
   fallback: {
     crypto: require.resolve('crypto-browserify'),
     buffer: require.resolve('buffer/'),
@@ -19,6 +23,9 @@ var resolve = {
   },
 };
 
+// Packages that shouldn't be bundled but loaded at runtime
+const externals = ['@jupyter-widgets/base'];
+
 module.exports = [
   {
     // Notebook extension
@@ -28,13 +35,18 @@ module.exports = [
     // some configuration for requirejs, and provides the legacy
     // "load_ipython_extension" function which is required for any notebook
     // extension.
-    entry: './src/extension.js',
+    entry: './src/extension.ts',
     output: {
       filename: 'extension.js',
       path: path.resolve(__dirname, '..', 'ipyleaflet', 'nbextension'),
       libraryTarget: 'amd',
     },
-    resolve: resolve,
+    module: {
+      rules: rules,
+    },
+    devtool: 'source-map',
+    externals,
+    resolve,
   },
   {
     // Bundle for the notebook containing the custom widget views and models
@@ -42,7 +54,7 @@ module.exports = [
     // This bundle contains the implementation for the custom widget views and
     // custom widget.
     // It must be an amd module
-    entry: ['./amd-public-path.js', './src/notebook.js'],
+    entry: ['./src/amd-public-path.ts', './src/notebook.ts'],
     output: {
       filename: 'index.js',
       path: path.resolve(__dirname, '..', 'ipyleaflet', 'nbextension'),
@@ -54,7 +66,7 @@ module.exports = [
       rules: rules,
     },
     // 'module' is the magic requirejs dependency used to set the publicPath
-    externals: ['@jupyter-widgets/base', 'module'],
+    externals: [...externals, 'module'],
     resolve: resolve,
   },
   {
@@ -67,7 +79,7 @@ module.exports = [
     //
     // The target bundle is always `dist/index.js`, which is the path
     // required by the custom widget embedder.
-    entry: ['./amd-public-path.js', './src/embed.js'],
+    entry: ['./src/amd-public-path.ts', './src/embed.ts'],
     output: {
       filename: 'index.js',
       path: path.resolve(__dirname, 'dist'),
@@ -79,7 +91,7 @@ module.exports = [
       rules: rules,
     },
     // 'module' is the magic requirejs dependency used to set the publicPath
-    externals: ['@jupyter-widgets/base', 'module'],
+    externals: [...externals, 'module'],
     resolve: resolve,
   },
 ];
diff --git a/js/yarn.lock b/js/yarn.lock
index 42ff574c1..52f199147 100644
--- a/js/yarn.lock
+++ b/js/yarn.lock
@@ -31,15 +31,15 @@ __metadata:
   linkType: hard
 
 "@eslint-community/regexpp@npm:^4.6.1":
-  version: 4.8.0
-  resolution: "@eslint-community/regexpp@npm:4.8.0"
-  checksum: 601e6d033d556e98e8c929905bef335f20d7389762812df4d0f709d9b4d2631610dda975fb272e23b5b68e24a163b3851b114c8080a0a19fb4c141a1eff6305b
+  version: 4.10.0
+  resolution: "@eslint-community/regexpp@npm:4.10.0"
+  checksum: 2a6e345429ea8382aaaf3a61f865cae16ed44d31ca917910033c02dc00d505d939f10b81e079fa14d43b51499c640138e153b7e40743c4c094d9df97d4e56f7b
   languageName: node
   linkType: hard
 
-"@eslint/eslintrc@npm:^2.1.2":
-  version: 2.1.2
-  resolution: "@eslint/eslintrc@npm:2.1.2"
+"@eslint/eslintrc@npm:^2.1.4":
+  version: 2.1.4
+  resolution: "@eslint/eslintrc@npm:2.1.4"
   dependencies:
     ajv: ^6.12.4
     debug: ^4.3.2
@@ -50,25 +50,25 @@ __metadata:
     js-yaml: ^4.1.0
     minimatch: ^3.1.2
     strip-json-comments: ^3.1.1
-  checksum: bc742a1e3b361f06fedb4afb6bf32cbd27171292ef7924f61c62f2aed73048367bcc7ac68f98c06d4245cd3fabc43270f844e3c1699936d4734b3ac5398814a7
+  checksum: 10957c7592b20ca0089262d8c2a8accbad14b4f6507e35416c32ee6b4dbf9cad67dfb77096bbd405405e9ada2b107f3797fe94362e1c55e0b09d6e90dd149127
   languageName: node
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-"@eslint/js@npm:8.48.0":
-  version: 8.48.0
-  resolution: "@eslint/js@npm:8.48.0"
-  checksum: b2755f9c0ee810c886eba3c50dcacb184ba5a5cd1cbc01988ee506ad7340653cae0bd55f1d95c64b56dfc6d25c2caa7825335ffd2c50165bae9996fe0f396851
+"@eslint/js@npm:8.56.0":
+  version: 8.56.0
+  resolution: "@eslint/js@npm:8.56.0"
+  checksum: 5804130574ef810207bdf321c265437814e7a26f4e6fac9b496de3206afd52f533e09ec002a3be06cd9adcc9da63e727f1883938e663c4e4751c007d5b58e539
   languageName: node
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-"@humanwhocodes/config-array@npm:^0.11.10":
-  version: 0.11.11
-  resolution: "@humanwhocodes/config-array@npm:0.11.11"
+"@humanwhocodes/config-array@npm:^0.11.13":
+  version: 0.11.13
+  resolution: "@humanwhocodes/config-array@npm:0.11.13"
   dependencies:
-    "@humanwhocodes/object-schema": ^1.2.1
+    "@humanwhocodes/object-schema": ^2.0.1
     debug: ^4.1.1
     minimatch: ^3.0.5
-  checksum: db84507375ab77b8ffdd24f498a5b49ad6b64391d30dd2ac56885501d03964d29637e05b1ed5aefa09d57ac667e28028bc22d2da872bfcd619652fbdb5f4ca19
+  checksum: f8ea57b0d7ed7f2d64cd3944654976829d9da91c04d9c860e18804729a33f7681f78166ef4c761850b8c324d362f7d53f14c5c44907a6b38b32c703ff85e4805
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@@ -79,10 +79,10 @@ __metadata:
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   linkType: hard
 
-"@humanwhocodes/object-schema@npm:^1.2.1":
-  version: 1.2.1
-  resolution: "@humanwhocodes/object-schema@npm:1.2.1"
-  checksum: a824a1ec31591231e4bad5787641f59e9633827d0a2eaae131a288d33c9ef0290bd16fda8da6f7c0fcb014147865d12118df10db57f27f41e20da92369fcb3f1
+"@humanwhocodes/object-schema@npm:^2.0.1":
+  version: 2.0.1
+  resolution: "@humanwhocodes/object-schema@npm:2.0.1"
+  checksum: 24929487b1ed48795d2f08346a0116cc5ee4634848bce64161fb947109352c562310fd159fc64dda0e8b853307f5794605191a9547f7341158559ca3c8262a45
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@@ -153,18 +153,18 @@ __metadata:
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 "@jridgewell/trace-mapping@npm:^0.3.17, @jridgewell/trace-mapping@npm:^0.3.9":
-  version: 0.3.19
-  resolution: "@jridgewell/trace-mapping@npm:0.3.19"
+  version: 0.3.20
+  resolution: "@jridgewell/trace-mapping@npm:0.3.20"
   dependencies:
     "@jridgewell/resolve-uri": ^3.1.0
     "@jridgewell/sourcemap-codec": ^1.4.14
-  checksum: 956a6f0f6fec060fb48c6bf1f5ec2064e13cd38c8be3873877d4b92b4a27ba58289a34071752671262a3e3c202abcc3fa2aac64d8447b4b0fa1ba3c9047f1c20
+  checksum: cd1a7353135f385909468ff0cf20bdd37e59f2ee49a13a966dedf921943e222082c583ade2b579ff6cd0d8faafcb5461f253e1bf2a9f48fec439211fdbe788f5
   languageName: node
   linkType: hard
 
 "@jupyter-widgets/base@npm:^2 || ^3 || ^4 || ^5 || ^6":
-  version: 6.0.5
-  resolution: "@jupyter-widgets/base@npm:6.0.5"
+  version: 6.0.6
+  resolution: "@jupyter-widgets/base@npm:6.0.6"
   dependencies:
     "@jupyterlab/services": ^6.0.0 || ^7.0.0
     "@lumino/coreutils": ^1.11.1 || ^2.1
@@ -175,13 +175,13 @@ __metadata:
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     jquery: ^3.1.1
     lodash: ^4.17.4
-  checksum: d9090c172d6504f95a7b1906e4b8c7be722318103b5721fa447140d04888448ebc31f47887c1dfc9022fff183b41cf6dbb7a2d2b3f821d05fe17350281fc3a17
+  checksum: 6414a56d7aaf287462b97f192f5022f9f3f52809df2e6e49b64073cb6ab851dea005033d508730140159e4dc6ef54a2af2d637c6ce3b6813a52d29fc153be296
   languageName: node
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-"@jupyter/ydoc@npm:^1.0.2":
-  version: 1.0.2
-  resolution: "@jupyter/ydoc@npm:1.0.2"
+"@jupyter/ydoc@npm:^1.1.1":
+  version: 1.1.1
+  resolution: "@jupyter/ydoc@npm:1.1.1"
   dependencies:
     "@jupyterlab/nbformat": ^3.0.0 || ^4.0.0-alpha.21 || ^4.0.0
     "@lumino/coreutils": ^1.11.0 || ^2.0.0
@@ -189,7 +189,7 @@ __metadata:
     "@lumino/signaling": ^1.10.0 || ^2.0.0
     y-protocols: ^1.0.5
     yjs: ^13.5.40
-  checksum: 739f9630940466b3cfcd7b742dd06479f81772ca13f863d057af0bbb5e318829506969066ab72977e7c721644982b5c8f88cf44e1ae81955ed1c27e87632d1f2
+  checksum: a239b1dd57cfc9ba36c06ac5032a1b6388849ae01a1d0db0d45094f71fdadf4d473b4bf8becbef0cfcdc85cae505361fbec0822b02da5aa48e06b66f742dd7a0
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@@ -234,9 +234,9 @@ __metadata:
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-"@jupyterlab/coreutils@npm:^6.0.5":
-  version: 6.0.5
-  resolution: "@jupyterlab/coreutils@npm:6.0.5"
+"@jupyterlab/coreutils@npm:^6.0.9":
+  version: 6.0.9
+  resolution: "@jupyterlab/coreutils@npm:6.0.9"
   dependencies:
     "@lumino/coreutils": ^2.1.2
     "@lumino/disposable": ^2.1.2
@@ -244,44 +244,44 @@ __metadata:
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     path-browserify: ^1.0.0
     url-parse: ~1.5.4
-  checksum: c09be7c8f389bb7f019fb868acfc528a0bc553a7b091412b7e0bfb1d0f2c71223ada8d6972d42df25fb6f70be21ecac00703e12d1df62a44dc2a512baac54dac
+  checksum: d2e9bb5d55f7bf3d439151ca4dbbd404adf742be31ea98a5713869f65cc86ebc8e89459ad7d0792cab51ebd7136d77ec86bf06ff990dd88f6d66780296d8983d
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-"@jupyterlab/nbformat@npm:^3.0.0 || ^4.0.0-alpha.21 || ^4.0.0, @jupyterlab/nbformat@npm:^4.0.5":
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-  resolution: "@jupyterlab/nbformat@npm:4.0.5"
+"@jupyterlab/nbformat@npm:^3.0.0 || ^4.0.0-alpha.21 || ^4.0.0, @jupyterlab/nbformat@npm:^4.0.9":
+  version: 4.0.9
+  resolution: "@jupyterlab/nbformat@npm:4.0.9"
   dependencies:
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-  checksum: 51611e95e6b16dc3e952b731e0ef036d1e0f7eec497555e3bf8394f181da4184dc37c6b25a1b11b5ea031f22fd4b9602fb6a2e675d65fddc2ccb099236cf3e01
+  checksum: 9fb2f2e03c749c46dc2ff4a815ba7a7525dae5d0c44b3d9887a6405b869329d9b3db72f69eada145543a8b37172f5466abf3a621f458793b0565d244218d32e2
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 "@jupyterlab/services@npm:^6.0.0 || ^7.0.0":
-  version: 7.0.5
-  resolution: "@jupyterlab/services@npm:7.0.5"
-  dependencies:
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-    "@jupyterlab/coreutils": ^6.0.5
-    "@jupyterlab/nbformat": ^4.0.5
-    "@jupyterlab/settingregistry": ^4.0.5
-    "@jupyterlab/statedb": ^4.0.5
+  version: 7.0.9
+  resolution: "@jupyterlab/services@npm:7.0.9"
+  dependencies:
+    "@jupyter/ydoc": ^1.1.1
+    "@jupyterlab/coreutils": ^6.0.9
+    "@jupyterlab/nbformat": ^4.0.9
+    "@jupyterlab/settingregistry": ^4.0.9
+    "@jupyterlab/statedb": ^4.0.9
     "@lumino/coreutils": ^2.1.2
     "@lumino/disposable": ^2.1.2
     "@lumino/polling": ^2.1.2
     "@lumino/properties": ^2.0.1
     "@lumino/signaling": ^2.1.2
     ws: ^8.11.0
-  checksum: cf4176dbb73c08e777b5e6ca26cba6ad7a142fc76ae6b46ef17ac7d8c8021f62d66e95e2ee0dbce5c33a0b2380750d440783d0398d787b8e8028920e04dd1d0b
+  checksum: 115b878d44b4ce966fe659ca300cca25b13f00e03770d6185e81f0665b88ae3cb1f11b8738a6d66708f3e59c9126c707618c28f90bd7d6c4715f7df31642c15e
   languageName: node
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-"@jupyterlab/settingregistry@npm:^4.0.5":
-  version: 4.0.5
-  resolution: "@jupyterlab/settingregistry@npm:4.0.5"
+"@jupyterlab/settingregistry@npm:^4.0.9":
+  version: 4.0.9
+  resolution: "@jupyterlab/settingregistry@npm:4.0.9"
   dependencies:
-    "@jupyterlab/nbformat": ^4.0.5
-    "@jupyterlab/statedb": ^4.0.5
+    "@jupyterlab/nbformat": ^4.0.9
+    "@jupyterlab/statedb": ^4.0.9
     "@lumino/commands": ^2.1.3
     "@lumino/coreutils": ^2.1.2
     "@lumino/disposable": ^2.1.2
@@ -291,20 +291,20 @@ __metadata:
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   peerDependencies:
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-  checksum: b7d686e0f9629f25f423fbd114e598f5af2ae1cc7b683f3e236ff8c94f6d05b20e13ee4555e0eba6277b58fbcdf3c75dbcd66d4e79884b49bed649372d871540
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-  version: 4.0.5
-  resolution: "@jupyterlab/statedb@npm:4.0.5"
+"@jupyterlab/statedb@npm:^4.0.9":
+  version: 4.0.9
+  resolution: "@jupyterlab/statedb@npm:4.0.9"
   dependencies:
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     "@lumino/coreutils": ^2.1.2
     "@lumino/disposable": ^2.1.2
     "@lumino/properties": ^2.0.1
     "@lumino/signaling": ^2.1.2
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-  resolution: "@lumino/commands@npm:2.1.3"
-  dependencies:
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-    "@lumino/keyboard": ^2.0.1
-    "@lumino/signaling": ^2.1.2
-    "@lumino/virtualdom": ^2.0.1
-  checksum: e4e3ee279f2a5e8d68e4ce142c880333f5542f90c684972402356936ecb5cf5e07163800b59e7cb8c911cbdb4e5089edcc5dd2990bc8db10c87517268de1fc5d
-  languageName: node
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-
-"@lumino/commands@npm:^2.2.0":
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   resolution: "@lumino/commands@npm:2.2.0"
   dependencies:
@@ -404,16 +389,6 @@ __metadata:
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-"@lumino/dragdrop@npm:^2.1.3":
-  version: 2.1.3
-  resolution: "@lumino/dragdrop@npm:2.1.3"
-  dependencies:
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-    "@lumino/disposable": ^2.1.2
-  checksum: d5f7eb4cc9f9a084cb9af10f02d6741b25d683350878ecbc324e24ba9d4b5246451a410e2ca5fff227aab1c191d1e73a2faf431f93e13111d67a4e426e126258
-  languageName: node
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   resolution: "@lumino/dragdrop@npm:2.1.4"
@@ -488,26 +463,7 @@ __metadata:
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-"@lumino/widgets@npm:^1.30.0 || ^2.1":
-  version: 2.3.0
-  resolution: "@lumino/widgets@npm:2.3.0"
-  dependencies:
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-    "@lumino/commands": ^2.1.3
-    "@lumino/coreutils": ^2.1.2
-    "@lumino/disposable": ^2.1.2
-    "@lumino/domutils": ^2.0.1
-    "@lumino/dragdrop": ^2.1.3
-    "@lumino/keyboard": ^2.0.1
-    "@lumino/messaging": ^2.0.1
-    "@lumino/properties": ^2.0.1
-    "@lumino/signaling": ^2.1.2
-    "@lumino/virtualdom": ^2.0.1
-  checksum: a8559bd3574b7fc16e7679e05994c515b0d3e78dada35786d161f67c639941d134e92ce31d95c2e4ac06709cdf83b0e7fb4b6414a3f7779579222a2fb525d025
-  languageName: node
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-"@lumino/widgets@npm:^2.3.0, @lumino/widgets@npm:^2.3.1":
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   resolution: "@lumino/widgets@npm:2.3.1"
   dependencies:
@@ -606,8 +562,8 @@ __metadata:
   linkType: hard
 
 "@rjsf/utils@npm:^5.1.0":
-  version: 5.12.1
-  resolution: "@rjsf/utils@npm:5.12.1"
+  version: 5.15.1
+  resolution: "@rjsf/utils@npm:5.15.1"
   dependencies:
     json-schema-merge-allof: ^0.8.1
     jsonpointer: ^5.0.1
@@ -616,7 +572,7 @@ __metadata:
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   peerDependencies:
     react: ^16.14.0 || >=17
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@@ -694,49 +650,49 @@ __metadata:
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 "@types/eslint-scope@npm:^3.7.3":
-  version: 3.7.4
-  resolution: "@types/eslint-scope@npm:3.7.4"
+  version: 3.7.7
+  resolution: "@types/eslint-scope@npm:3.7.7"
   dependencies:
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     "@types/estree": "*"
-  checksum: ea6a9363e92f301cd3888194469f9ec9d0021fe0a397a97a6dd689e7545c75de0bd2153dfb13d3ab532853a278b6572c6f678ce846980669e41029d205653460
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   languageName: node
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 "@types/eslint@npm:*":
-  version: 8.44.2
-  resolution: "@types/eslint@npm:8.44.2"
+  version: 8.56.0
+  resolution: "@types/eslint@npm:8.56.0"
   dependencies:
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     "@types/json-schema": "*"
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 "@types/estree@npm:*, @types/estree@npm:^1.0.0":
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-  resolution: "@types/estree@npm:1.0.1"
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-"@types/jquery@npm:*":
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