diff --git a/gantt-chart/package.json b/gantt-chart/package.json
index 962620d..c908d69 100644
--- a/gantt-chart/package.json
+++ b/gantt-chart/package.json
@@ -19,6 +19,7 @@
   },
   "devDependencies": {
     "@babel/plugin-proposal-class-properties": "^7.18.6",
+    "@babel/plugin-proposal-object-rest-spread": "^7.20.7",
     "@types/enzyme-adapter-react-16": "^1.0.6",
     "@types/react-plotly.js": "^2.2.4",
     "@types/showdown": "^1.9.3",
diff --git a/gantt-chart/yarn.lock b/gantt-chart/yarn.lock
index 6354ba7..22f079d 100644
--- a/gantt-chart/yarn.lock
+++ b/gantt-chart/yarn.lock
@@ -17,6 +17,11 @@
     "@babel/highlight" "^7.23.4"
     chalk "^2.4.2"
 
+"@babel/compat-data@^7.20.5", "@babel/compat-data@^7.23.5":
+  version "7.23.5"
+  resolved "https://registry.yarnpkg.com/@babel/compat-data/-/compat-data-7.23.5.tgz#ffb878728bb6bdcb6f4510aa51b1be9afb8cfd98"
+  integrity sha512-uU27kfDRlhfKl+w1U6vp16IuvSLtjAxdArVXPa9BvLkrr7CYIsxH5adpHObeAGY/41+syctUWOZ140a2Rvkgjw==
+
 "@babel/helper-annotate-as-pure@^7.22.5":
   version "7.22.5"
   resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.22.5.tgz#e7f06737b197d580a01edf75d97e2c8be99d3882"
@@ -24,6 +29,17 @@
   dependencies:
     "@babel/types" "^7.22.5"
 
+"@babel/helper-compilation-targets@^7.20.7":
+  version "7.23.6"
+  resolved "https://registry.yarnpkg.com/@babel/helper-compilation-targets/-/helper-compilation-targets-7.23.6.tgz#4d79069b16cbcf1461289eccfbbd81501ae39991"
+  integrity sha512-9JB548GZoQVmzrFgp8o7KxdgkTGm6xs9DW0o/Pim72UDjzr5ObUQ6ZzYPqA+g9OTS2bBQoctLJrky0RDCAWRgQ==
+  dependencies:
+    "@babel/compat-data" "^7.23.5"
+    "@babel/helper-validator-option" "^7.23.5"
+    browserslist "^4.22.2"
+    lru-cache "^5.1.1"
+    semver "^6.3.1"
+
 "@babel/helper-create-class-features-plugin@^7.18.6":
   version "7.23.6"
   resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.23.6.tgz#b04d915ce92ce363666f816a884cdcfc9be04953"
@@ -66,7 +82,7 @@
   dependencies:
     "@babel/types" "^7.22.5"
 
-"@babel/helper-plugin-utils@^7.18.6":
+"@babel/helper-plugin-utils@^7.18.6", "@babel/helper-plugin-utils@^7.20.2", "@babel/helper-plugin-utils@^7.22.5", "@babel/helper-plugin-utils@^7.8.0":
   version "7.22.5"
   resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.22.5.tgz#dd7ee3735e8a313b9f7b05a773d892e88e6d7295"
   integrity sha512-uLls06UVKgFG9QD4OeFYLEGteMIAa5kpTPcFL28yuCIIzsf6ZyKZMllKVOCZFhiZ5ptnwX4mtKdWCBE/uT4amg==
@@ -109,6 +125,11 @@
   resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz#c4ae002c61d2879e724581d96665583dbc1dc0e0"
   integrity sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A==
 
+"@babel/helper-validator-option@^7.23.5":
+  version "7.23.5"
+  resolved "https://registry.yarnpkg.com/@babel/helper-validator-option/-/helper-validator-option-7.23.5.tgz#907a3fbd4523426285365d1206c423c4c5520307"
+  integrity sha512-85ttAOMLsr53VgXkTbkx8oA6YTfT4q7/HzXSLEYmjcSTJPMPQtvq1BD79Byep5xMUYbGRzEpDsjUf3dyp54IKw==
+
 "@babel/highlight@^7.18.6":
   version "7.18.6"
   resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.18.6.tgz#81158601e93e2563795adcbfbdf5d64be3f2ecdf"
@@ -140,6 +161,31 @@
     "@babel/helper-create-class-features-plugin" "^7.18.6"
     "@babel/helper-plugin-utils" "^7.18.6"
 
+"@babel/plugin-proposal-object-rest-spread@^7.20.7":
+  version "7.20.7"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.20.7.tgz#aa662940ef425779c75534a5c41e9d936edc390a"
+  integrity sha512-d2S98yCiLxDVmBmE8UjGcfPvNEUbA1U5q5WxaWFUGRzJSVAZqm5W6MbPct0jxnegUZ0niLeNX+IOzEs7wYg9Dg==
+  dependencies:
+    "@babel/compat-data" "^7.20.5"
+    "@babel/helper-compilation-targets" "^7.20.7"
+    "@babel/helper-plugin-utils" "^7.20.2"
+    "@babel/plugin-syntax-object-rest-spread" "^7.8.3"
+    "@babel/plugin-transform-parameters" "^7.20.7"
+
+"@babel/plugin-syntax-object-rest-spread@^7.8.3":
+  version "7.8.3"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.8.3.tgz#60e225edcbd98a640332a2e72dd3e66f1af55871"
+  integrity sha512-XoqMijGZb9y3y2XskN+P1wUGiVwWZ5JmoDRwx5+3GmEplNyVM2s2Dg8ILFQm8rWM48orGy5YpI5Bl8U1y7ydlA==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.8.0"
+
+"@babel/plugin-transform-parameters@^7.20.7":
+  version "7.23.3"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-parameters/-/plugin-transform-parameters-7.23.3.tgz#83ef5d1baf4b1072fa6e54b2b0999a7b2527e2af"
+  integrity sha512-09lMt6UsUb3/34BbECKVbVwrT9bO6lILWln237z7sLaWnMsTi7Yc9fhX5DLpkJzAGfaReXI22wP41SZmnAA3Vw==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.22.5"
+
 "@babel/template@^7.22.15":
   version "7.22.15"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.22.15.tgz#09576efc3830f0430f4548ef971dde1350ef2f38"
@@ -438,6 +484,16 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
+browserslist@^4.22.2:
+  version "4.22.2"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.22.2.tgz#704c4943072bd81ea18997f3bd2180e89c77874b"
+  integrity sha512-0UgcrvQmBDvZHFGdYUehrCNIazki7/lUP3kkoi/r3YB2amZbFM9J43ZRkJTXBUZK4gmx56+Sqk9+Vs9mwZx9+A==
+  dependencies:
+    caniuse-lite "^1.0.30001565"
+    electron-to-chromium "^1.4.601"
+    node-releases "^2.0.14"
+    update-browserslist-db "^1.0.13"
+
 buffer-crc32@~0.2.3:
   version "0.2.13"
   resolved "https://registry.yarnpkg.com/buffer-crc32/-/buffer-crc32-0.2.13.tgz#0d333e3f00eac50aa1454abd30ef8c2a5d9a7242"
@@ -466,6 +522,11 @@ callsites@^3.0.0:
   resolved "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73"
   integrity sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==
 
+caniuse-lite@^1.0.30001565:
+  version "1.0.30001568"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001568.tgz#53fa9297273c9a977a560663f48cbea1767518b7"
+  integrity sha512-vSUkH84HontZJ88MiNrOau1EBrCqEQYgkC5gIySiDlpsm8sGVrhU7Kx4V6h0tnqaHzIHZv08HlJIwPbL4XL9+A==
+
 caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
@@ -741,6 +802,11 @@ ecc-jsbn@~0.1.1:
     jsbn "~0.1.0"
     safer-buffer "^2.1.0"
 
+electron-to-chromium@^1.4.601:
+  version "1.4.611"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.4.611.tgz#92d3a8f03110fbf5f99b054da97825f994fa480a"
+  integrity sha512-ZtRpDxrjHapOwxtv+nuth5ByB8clyn8crVynmRNGO3wG3LOp8RTcyZDqwaI6Ng6y8FCK2hVZmJoqwCskKbNMaw==
+
 elegant-spinner@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/elegant-spinner/-/elegant-spinner-1.0.1.tgz#db043521c95d7e303fd8f345bedc3349cfb0729e"
@@ -763,6 +829,11 @@ end-of-stream@^1.1.0:
   dependencies:
     once "^1.4.0"
 
+escalade@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/escalade/-/escalade-3.1.1.tgz#d8cfdc7000965c5a0174b4a82eaa5c0552742e40"
+  integrity sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==
+
 escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
@@ -1484,6 +1555,13 @@ loose-envify@^1.4.0:
   dependencies:
     js-tokens "^3.0.0 || ^4.0.0"
 
+lru-cache@^5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-5.1.1.tgz#1da27e6710271947695daf6848e847f01d84b920"
+  integrity sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==
+  dependencies:
+    yallist "^3.0.2"
+
 lru-cache@^6.0.0:
   version "6.0.0"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-6.0.0.tgz#6d6fe6570ebd96aaf90fcad1dafa3b2566db3a94"
@@ -1562,6 +1640,11 @@ nice-try@^1.0.4:
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
   integrity sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==
 
+node-releases@^2.0.14:
+  version "2.0.14"
+  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-2.0.14.tgz#2ffb053bceb8b2be8495ece1ab6ce600c4461b0b"
+  integrity sha512-y10wOWt8yZpqXmOgRo77WaHEmhYQYGNA6y421PKsKYWEK8aW+cqAphborZDhqfyKrbZEN92CN1X2KbafY2s7Yw==
+
 npm-run-path@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-4.0.1.tgz#b7ecd1e5ed53da8e37a55e1c2269e0b97ed748ea"
@@ -1669,6 +1752,11 @@ performance-now@^2.1.0:
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
   integrity sha512-7EAHlyLHI56VEIdK57uwHdHKIaAGbnXPiw0yWbarQZOKaKpvUIgW0jWRVLiatnM+XXlSwsanIBH/hzGMJulMow==
 
+picocolors@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/picocolors/-/picocolors-1.0.0.tgz#cb5bdc74ff3f51892236eaf79d68bc44564ab81c"
+  integrity sha512-1fygroTLlHu66zi26VoTDv8yRgm0Fccecssto+MhsZ0D/DGW2sm8E8AjW7NU5VVTRt5GxbeZ5qBuJr+HyLYkjQ==
+
 pify@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
@@ -2161,6 +2249,14 @@ untildify@^4.0.0:
   resolved "https://registry.yarnpkg.com/untildify/-/untildify-4.0.0.tgz#2bc947b953652487e4600949fb091e3ae8cd919b"
   integrity sha512-KK8xQ1mkzZeg9inewmFVDNkg3l5LUhoq9kN6iWYB/CC9YMG8HA+c1Q8HwDe6dEX7kErrEVNVBO3fWsVq5iDgtw==
 
+update-browserslist-db@^1.0.13:
+  version "1.0.13"
+  resolved "https://registry.yarnpkg.com/update-browserslist-db/-/update-browserslist-db-1.0.13.tgz#3c5e4f5c083661bd38ef64b6328c26ed6c8248c4"
+  integrity sha512-xebP81SNcPuNpPP3uzeW1NYXxI3rxyJzF3pD6sH4jE7o/IX+WtSpwnVU+qIsDPyk0d3hmFQ7mjqc6AtV604hbg==
+  dependencies:
+    escalade "^3.1.1"
+    picocolors "^1.0.0"
+
 uri-js@^4.2.2:
   version "4.4.1"
   resolved "https://registry.yarnpkg.com/uri-js/-/uri-js-4.4.1.tgz#9b1a52595225859e55f669d928f88c6c57f2a77e"
@@ -2247,6 +2343,11 @@ write@1.0.3:
   dependencies:
     mkdirp "^0.5.1"
 
+yallist@^3.0.2:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
+  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
+
 yallist@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-4.0.0.tgz#9bb92790d9c0effec63be73519e11a35019a3a72"