diff --git a/README.md b/README.md
index 74872fd..64daf03 100644
--- a/README.md
+++ b/README.md
@@ -1,50 +1,62 @@
-# React + TypeScript + Vite
+# decimal128-tsc-issue
 
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+Steps:
 
-Currently, two official plugins are available:
+- Run `npm run build`
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+Expected result:
 
-## Expanding the ESLint configuration
+- Build completes successfully
 
-If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
+Actual result:
 
-- Configure the top-level `parserOptions` property like this:
+- Build fails:
+    ```text
+    node_modules/decimal128/src/Decimal.mts:3:7 - error TS6133: 'ratOne' is declared but its value is never read.
+
+    3 const ratOne = new Rational(1n, 1n);
+            ~~~~~~
+
+    node_modules/decimal128/src/Decimal.mts:4:7 - error TS6133: 'ratTen' is declared but its value is never read.
+
+    4 const ratTen = new Rational(10n, 1n);
+            ~~~~~~
+
+    node_modules/decimal128/src/Decimal.mts:49:14 - error TS6133: 'dec' is declared but its value is never read.
+
+    49         let [dec, exp] = s.split(/[eE]/);
+                    ~~~
+
+    node_modules/decimal128/src/Decimal128.mts:45:5 - error TS6133: 'd' is declared but its value is never read.
+
+    45     d: "0" | "-0" | Rational,
+           ~
+
+    node_modules/decimal128/src/Rational.mts:7:5 - error TS6133: 'ROUNDING_MODE_HALF_EXPAND' is declared but its value is never read.
+
+    7     ROUNDING_MODE_HALF_EXPAND,
+          ~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    node_modules/decimal128/src/Rational.mts:321:9 - error TS6133: 'penultimateDigit' is declared but its value is never read.
+
+    321         penultimateDigit: Digit,
+                ~~~~~~~~~~~~~~~~
+
+    node_modules/decimal128/src/Rational.mts:337:9 - error TS6133: 'penultimateDigit' is declared but its value is never read.
+
+    337         penultimateDigit: Digit,
+                ~~~~~~~~~~~~~~~~
+
+    node_modules/decimal128/src/Rational.mts:354:9 - error TS6133: 'penultimateDigit' is declared but its value is never read.
+
+    354         penultimateDigit: Digit,
+                ~~~~~~~~~~~~~~~~
+
+    node_modules/decimal128/src/Rational.mts:355:9 - error TS6133: 'finalDigit' is declared but its value is never read.
+
+    355         finalDigit: Digit,
+                ~~~~~~~~~~
 
-```js
-export default tseslint.config({
-  languageOptions: {
-    // other options...
-    parserOptions: {
-      project: ['./tsconfig.node.json', './tsconfig.app.json'],
-      tsconfigRootDir: import.meta.dirname,
-    },
-  },
-})
-```
 
-- Replace `tseslint.configs.recommended` to `tseslint.configs.recommendedTypeChecked` or `tseslint.configs.strictTypeChecked`
-- Optionally add `...tseslint.configs.stylisticTypeChecked`
-- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and update the config:
-
-```js
-// eslint.config.js
-import react from 'eslint-plugin-react'
-
-export default tseslint.config({
-  // Set the react version
-  settings: { react: { version: '18.3' } },
-  plugins: {
-    // Add the react plugin
-    react,
-  },
-  rules: {
-    // other rules...
-    // Enable its recommended rules
-    ...react.configs.recommended.rules,
-    ...react.configs['jsx-runtime'].rules,
-  },
-})
+    Found 9 errors.
 ```
diff --git a/package-lock.json b/package-lock.json
index 60994c7..c282552 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "name": "decimal128-tsc-issue",
       "version": "0.0.0",
       "dependencies": {
+        "decimal128": "^18.0.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1"
       },
@@ -1833,6 +1834,12 @@
         }
       }
     },
+    "node_modules/decimal128": {
+      "version": "18.0.0",
+      "resolved": "https://registry.npmjs.org/decimal128/-/decimal128-18.0.0.tgz",
+      "integrity": "sha512-dq8Fis6Uulaj3wCgW+RdwJfXnxCbgr8iQJKevCrycJh/NPGxzVzvq1RvFcw4rmIdfZrI9KI1pCCF9Xt6DQc8yg==",
+      "license": "ISC"
+    },
     "node_modules/deep-is": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.4.tgz",
diff --git a/package.json b/package.json
index 303ef6c..d3578cc 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "decimal128": "^18.0.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },
diff --git a/src/App.tsx b/src/App.tsx
index afe48ac..728bf76 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -2,9 +2,10 @@ import { useState } from 'react'
 import reactLogo from './assets/react.svg'
 import viteLogo from '/vite.svg'
 import './App.css'
+import { Decimal128 } from "decimal128"
 
 function App() {
-  const [count, setCount] = useState(0)
+  const [count, setCount] = useState(new Decimal128(0))
 
   return (
     <>
@@ -18,8 +19,8 @@ function App() {
       </div>
       <h1>Vite + React</h1>
       <div className="card">
-        <button onClick={() => setCount((count) => count + 1)}>
-          count is {count}
+        <button onClick={() => setCount((count) => count.add(new Decimal128(1)))}>
+          count is {count.toString()}
         </button>
         <p>
           Edit <code>src/App.tsx</code> and save to test HMR