diff --git a/apps/hebrew_calendar/app.js b/apps/hebrew_calendar/app.js
index 074c22988..ff30920e7 100644
--- a/apps/hebrew_calendar/app.js
+++ b/apps/hebrew_calendar/app.js
@@ -1,27 +1 @@
-g.clear();
-
-let now = new Date();
-let today = require("hebrewDate")(now);
-
-var mainmenu = {
-  "" : {
-    "title" : "Hebrew Date"
-  },
-  cal: {
-    value: require('locale').date(now,1),
-    onchange : () => {}
-  },
-  date: {
-    value : today.date,
-    onchange : () => {}
-  },
-  month: {
-    value : today.month_name,
-    onchange : () => {}
-  },
-  year: {
-    value : today.year,
-    onchange : () => {}
-  }
-};
-E.showMenu(mainmenu);
+!function(){"use strict";g.clear();let e=new Date,a=require("hebrewDate")(e);var n={"":{title:"Hebrew Date"},cal:{value:require("locale").date(e,1),onchange:()=>{}},date:{value:a.date,onchange:()=>{}},month:{value:a.month_name,onchange:()=>{}},year:{value:a.year,onchange:()=>{}}};E.showMenu(n)}();
diff --git a/apps/hebrew_calendar/package.json b/apps/hebrew_calendar/package.json
new file mode 100644
index 000000000..c509b70bb
--- /dev/null
+++ b/apps/hebrew_calendar/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "hebrew_calendar",
+  "version": "0.0.1",
+  "description": "Bangle.js app for seeing hebrew calendar",
+  "main": "app.js",
+  "types": "app.d.ts",
+  "scripts": {
+    "build": "rollup -c"
+  },
+  "author": {
+    "name": "Michael Salaverry",
+    "url": "https://github.com/barakplasma"
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "@rollup/plugin-typescript": "^4.1.1",
+    "rollup": "^2.10.2",
+    "rollup-plugin-terser": "^5.3.0",
+    "terser": "^4.7.0",
+    "tslib": "^2.0.0",
+    "typescript": "^3.9.2"
+  }
+}
diff --git a/apps/hebrew_calendar/rollup.config.js b/apps/hebrew_calendar/rollup.config.js
new file mode 100644
index 000000000..5f7f0746f
--- /dev/null
+++ b/apps/hebrew_calendar/rollup.config.js
@@ -0,0 +1,15 @@
+import typescript from '@rollup/plugin-typescript';
+import { terser } from 'rollup-plugin-terser';
+
+export default {
+  input: './src/app.ts',
+  output: {
+    dir: '.',
+    format: 'iife',
+    name: 'hebrew_calendar'
+  },
+  plugins: [
+    typescript(),
+    terser(),
+  ]
+};
diff --git a/apps/hebrew_calendar/src/app.ts b/apps/hebrew_calendar/src/app.ts
new file mode 100644
index 000000000..111f47184
--- /dev/null
+++ b/apps/hebrew_calendar/src/app.ts
@@ -0,0 +1,32 @@
+declare var Bangle: any;
+declare var g: any;
+declare var E: any;
+declare var require: any;
+
+g.clear();
+
+let now = new Date();
+let today = require("hebrewDate")(now);
+
+var mainmenu = {
+  "" : {
+    "title" : "Hebrew Date"
+  },
+  cal: {
+    value: require('locale').date(now,1),
+    onchange : () => {}
+  },
+  date: {
+    value : today.date,
+    onchange : () => {}
+  },
+  month: {
+    value : today.month_name,
+    onchange : () => {}
+  },
+  year: {
+    value : today.year,
+    onchange : () => {}
+  }
+};
+E.showMenu(mainmenu);
diff --git a/apps/hebrew_calendar/hebrewDate.js b/apps/hebrew_calendar/src/hebrewDate.js
similarity index 100%
rename from apps/hebrew_calendar/hebrewDate.js
rename to apps/hebrew_calendar/src/hebrewDate.js
diff --git a/apps/hebrew_calendar/tsconfig.json b/apps/hebrew_calendar/tsconfig.json
new file mode 100644
index 000000000..a341a5a5e
--- /dev/null
+++ b/apps/hebrew_calendar/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "module": "es2015",
+    "noImplicitAny": true,
+    "target": "es2015"
+  },
+  "include": [
+    "src"
+  ]
+}