diff --git a/package.json b/package.json
index 6b8ec897..d76d8c6c 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
     "prettier": "prettier --check . --cache",
     "test": "yarn lint && yarn tsc && yarn prettier && yarn unit",
     "tsc": "tsc --noEmit",
-    "unit": "vitest"
+    "unit": "vitest",
+    "watch": "yarn build-js-esm --watch & yarn build-js-cjs --watch & nodemon --watch src --ext css --exec \"yarn copy-styles\""
   },
   "keywords": [
     "calendar",
@@ -53,6 +54,7 @@
     "eslint-config-wojtekmaj": "^0.9.0",
     "husky": "^8.0.0",
     "jsdom": "^21.1.0",
+    "nodemon": "^3.0.0",
     "prettier": "^2.7.0",
     "pretty-quick": "^3.1.0",
     "react": "^18.2.0",
diff --git a/yarn.lock b/yarn.lock
index b15384f8..745692a8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -826,7 +826,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"abbrev@npm:^1.0.0":
+"abbrev@npm:1, abbrev@npm:^1.0.0":
   version: 1.1.1
   resolution: "abbrev@npm:1.1.1"
   checksum: a4a97ec07d7ea112c517036882b2ac22f3109b7b19077dc656316d07d308438aac28e4d9746dc4d84bf6b1e75b4a7b0a5f3cb30592419f128ca9a8cee3bcfa17
@@ -952,6 +952,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"anymatch@npm:~3.1.2":
+  version: 3.1.3
+  resolution: "anymatch@npm:3.1.3"
+  dependencies:
+    normalize-path: ^3.0.0
+    picomatch: ^2.0.4
+  checksum: 3e044fd6d1d26545f235a9fe4d7a534e2029d8e59fa7fd9f2a6eb21230f6b5380ea1eaf55136e60cbf8e613544b3b766e7a6fa2102e2a3a117505466e3025dc2
+  languageName: node
+  linkType: hard
+
 "aproba@npm:^1.0.3 || ^2.0.0":
   version: 2.0.0
   resolution: "aproba@npm:2.0.0"
@@ -1138,6 +1148,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"binary-extensions@npm:^2.0.0":
+  version: 2.2.0
+  resolution: "binary-extensions@npm:2.2.0"
+  checksum: ccd267956c58d2315f5d3ea6757cf09863c5fc703e50fbeb13a7dc849b812ef76e3cf9ca8f35a0c48498776a7478d7b4a0418e1e2b8cb9cb9731f2922aaad7f8
+  languageName: node
+  linkType: hard
+
 "blueimp-md5@npm:^2.10.0":
   version: 2.19.0
   resolution: "blueimp-md5@npm:2.19.0"
@@ -1173,7 +1190,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"braces@npm:^3.0.2":
+"braces@npm:^3.0.2, braces@npm:~3.0.2":
   version: 3.0.2
   resolution: "braces@npm:3.0.2"
   dependencies:
@@ -1313,6 +1330,25 @@ __metadata:
   languageName: node
   linkType: hard
 
+"chokidar@npm:^3.5.2":
+  version: 3.5.3
+  resolution: "chokidar@npm:3.5.3"
+  dependencies:
+    anymatch: ~3.1.2
+    braces: ~3.0.2
+    fsevents: ~2.3.2
+    glob-parent: ~5.1.2
+    is-binary-path: ~2.1.0
+    is-glob: ~4.0.1
+    normalize-path: ~3.0.0
+    readdirp: ~3.6.0
+  dependenciesMeta:
+    fsevents:
+      optional: true
+  checksum: b49fcde40176ba007ff361b198a2d35df60d9bb2a5aab228279eb810feae9294a6b4649ab15981304447afe1e6ffbf4788ad5db77235dc770ab777c6e771980c
+  languageName: node
+  linkType: hard
+
 "chownr@npm:^2.0.0":
   version: 2.0.0
   resolution: "chownr@npm:2.0.0"
@@ -2633,7 +2669,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"glob-parent@npm:^5.1.2":
+"glob-parent@npm:^5.1.2, glob-parent@npm:~5.1.2":
   version: 5.1.2
   resolution: "glob-parent@npm:5.1.2"
   dependencies:
@@ -2932,6 +2968,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ignore-by-default@npm:^1.0.1":
+  version: 1.0.1
+  resolution: "ignore-by-default@npm:1.0.1"
+  checksum: 441509147b3615e0365e407a3c18e189f78c07af08564176c680be1fabc94b6c789cad1342ad887175d4ecd5225de86f73d376cec8e06b42fd9b429505ffcf8a
+  languageName: node
+  linkType: hard
+
 "ignore@npm:^5.1.4, ignore@npm:^5.2.0, ignore@npm:^5.2.4":
   version: 5.2.4
   resolution: "ignore@npm:5.2.4"
@@ -3049,6 +3092,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"is-binary-path@npm:~2.1.0":
+  version: 2.1.0
+  resolution: "is-binary-path@npm:2.1.0"
+  dependencies:
+    binary-extensions: ^2.0.0
+  checksum: 84192eb88cff70d320426f35ecd63c3d6d495da9d805b19bc65b518984b7c0760280e57dbf119b7e9be6b161784a5a673ab2c6abe83abb5198a432232ad5b35c
+  languageName: node
+  linkType: hard
+
 "is-boolean-object@npm:^1.1.0":
   version: 1.1.2
   resolution: "is-boolean-object@npm:1.1.2"
@@ -3116,7 +3168,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"is-glob@npm:^4.0.0, is-glob@npm:^4.0.1, is-glob@npm:^4.0.3":
+"is-glob@npm:^4.0.0, is-glob@npm:^4.0.1, is-glob@npm:^4.0.3, is-glob@npm:~4.0.1":
   version: 4.0.3
   resolution: "is-glob@npm:4.0.3"
   dependencies:
@@ -3998,6 +4050,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nodemon@npm:^3.0.0":
+  version: 3.0.1
+  resolution: "nodemon@npm:3.0.1"
+  dependencies:
+    chokidar: ^3.5.2
+    debug: ^3.2.7
+    ignore-by-default: ^1.0.1
+    minimatch: ^3.1.2
+    pstree.remy: ^1.1.8
+    semver: ^7.5.3
+    simple-update-notifier: ^2.0.0
+    supports-color: ^5.5.0
+    touch: ^3.1.0
+    undefsafe: ^2.0.5
+  bin:
+    nodemon: bin/nodemon.js
+  checksum: 6a5d81855760d6617049eccce10ccf02bddb482dab13ceea5280ae595ec7004eee13e7b934368e3f46c37fe4d970342a8c38c99cae7e93e4d7a3ed1c1ecb6acf
+  languageName: node
+  linkType: hard
+
 "nopt@npm:^6.0.0":
   version: 6.0.0
   resolution: "nopt@npm:6.0.0"
@@ -4009,6 +4081,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nopt@npm:~1.0.10":
+  version: 1.0.10
+  resolution: "nopt@npm:1.0.10"
+  dependencies:
+    abbrev: 1
+  bin:
+    nopt: ./bin/nopt.js
+  checksum: f62575aceaa3be43f365bf37a596b89bbac2e796b001b6d2e2a85c2140a4e378ff919e2753ccba959c4fd344776fc88c29b393bc167fa939fb1513f126f4cd45
+  languageName: node
+  linkType: hard
+
 "normalize-package-data@npm:^3.0.2":
   version: 3.0.3
   resolution: "normalize-package-data@npm:3.0.3"
@@ -4033,6 +4116,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"normalize-path@npm:^3.0.0, normalize-path@npm:~3.0.0":
+  version: 3.0.0
+  resolution: "normalize-path@npm:3.0.0"
+  checksum: 88eeb4da891e10b1318c4b2476b6e2ecbeb5ff97d946815ffea7794c31a89017c70d7f34b3c2ebf23ef4e9fc9fb99f7dffe36da22011b5b5c6ffa34f4873ec20
+  languageName: node
+  linkType: hard
+
 "npm-run-path@npm:^4.0.0, npm-run-path@npm:^4.0.1":
   version: 4.0.1
   resolution: "npm-run-path@npm:4.0.1"
@@ -4420,7 +4510,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"picomatch@npm:^2.2.3, picomatch@npm:^2.3.1":
+"picomatch@npm:^2.0.4, picomatch@npm:^2.2.1, picomatch@npm:^2.2.3, picomatch@npm:^2.3.1":
   version: 2.3.1
   resolution: "picomatch@npm:2.3.1"
   checksum: 050c865ce81119c4822c45d3c84f1ced46f93a0126febae20737bd05ca20589c564d6e9226977df859ed5e03dc73f02584a2b0faad36e896936238238b0446cf
@@ -4540,6 +4630,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"pstree.remy@npm:^1.1.8":
+  version: 1.1.8
+  resolution: "pstree.remy@npm:1.1.8"
+  checksum: 5cb53698d6bb34dfb278c8a26957964aecfff3e161af5fbf7cee00bbe9d8547c7aced4bd9cb193bce15fb56e9e4220fc02a5bf9c14345ffb13a36b858701ec2d
+  languageName: node
+  linkType: hard
+
 "pump@npm:^3.0.0":
   version: 3.0.0
   resolution: "pump@npm:3.0.0"
@@ -4594,6 +4691,7 @@ __metadata:
     get-user-locale: ^2.2.1
     husky: ^8.0.0
     jsdom: ^21.1.0
+    nodemon: ^3.0.0
     prettier: ^2.7.0
     pretty-quick: ^3.1.0
     prop-types: ^15.6.0
@@ -4689,6 +4787,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"readdirp@npm:~3.6.0":
+  version: 3.6.0
+  resolution: "readdirp@npm:3.6.0"
+  dependencies:
+    picomatch: ^2.2.1
+  checksum: 1ced032e6e45670b6d7352d71d21ce7edf7b9b928494dcaba6f11fba63180d9da6cd7061ebc34175ffda6ff529f481818c962952004d273178acd70f7059b320
+  languageName: node
+  linkType: hard
+
 "redent@npm:^3.0.0":
   version: 3.0.0
   resolution: "redent@npm:3.0.0"
@@ -4916,7 +5023,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"semver@npm:^7.3.2, semver@npm:^7.3.4, semver@npm:^7.3.5, semver@npm:^7.5.0":
+"semver@npm:^7.3.2, semver@npm:^7.3.4, semver@npm:^7.3.5, semver@npm:^7.5.0, semver@npm:^7.5.3":
   version: 7.5.4
   resolution: "semver@npm:7.5.4"
   dependencies:
@@ -4975,6 +5082,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"simple-update-notifier@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "simple-update-notifier@npm:2.0.0"
+  dependencies:
+    semver: ^7.5.3
+  checksum: 9ba00d38ce6a29682f64a46213834e4eb01634c2f52c813a9a7b8873ca49cdbb703696f3290f3b27dc067de6d9418b0b84bef22c3eb074acf352529b2d6c27fd
+  languageName: node
+  linkType: hard
+
 "slash@npm:^3.0.0":
   version: 3.0.0
   resolution: "slash@npm:3.0.0"
@@ -5239,7 +5355,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"supports-color@npm:^5.3.0":
+"supports-color@npm:^5.3.0, supports-color@npm:^5.5.0":
   version: 5.5.0
   resolution: "supports-color@npm:5.5.0"
   dependencies:
@@ -5360,6 +5476,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"touch@npm:^3.1.0":
+  version: 3.1.0
+  resolution: "touch@npm:3.1.0"
+  dependencies:
+    nopt: ~1.0.10
+  bin:
+    nodetouch: ./bin/nodetouch.js
+  checksum: e0be589cb5b0e6dbfce6e7e077d4a0d5f0aba558ef769c6d9c33f635e00d73d5be49da6f8631db302ee073919d82b5b7f56da2987feb28765c95a7673af68647
+  languageName: node
+  linkType: hard
+
 "tough-cookie@npm:^4.1.2":
   version: 4.1.3
   resolution: "tough-cookie@npm:4.1.3"
@@ -5503,6 +5630,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"undefsafe@npm:^2.0.5":
+  version: 2.0.5
+  resolution: "undefsafe@npm:2.0.5"
+  checksum: f42ab3b5770fedd4ada175fc1b2eb775b78f609156f7c389106aafd231bfc210813ee49f54483d7191d7b76e483bc7f537b5d92d19ded27156baf57592eb02cc
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^2.0.0":
   version: 2.0.1
   resolution: "unique-filename@npm:2.0.1"