diff --git a/package.json b/package.json
index b223ab1..72ede99 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
         "start-release": "npm run build && serve dist",
         "lint": "eslint \"{src,test}/**/*.{ts,tsx}\"",
         "typecheck": "tsc --noEmit",
-        "test": "tap run",
+        "test": "tap run --allow-incomplete-coverage",
         "prebuild": "npm run lint && npm run typecheck && npm run test",
         "preview": "vite preview"
     },
diff --git a/build-resources/th-en-x-basic.dat b/src/assets/th-en-x-basic.ooo-thesaurus
similarity index 100%
rename from build-resources/th-en-x-basic.dat
rename to src/assets/th-en-x-basic.ooo-thesaurus
diff --git a/src/build-scripts/oooThesaurusParser.test.ts b/src/build-scripts/oooThesaurusParser.test.ts
index 617fbb2..53a3062 100644
--- a/src/build-scripts/oooThesaurusParser.test.ts
+++ b/src/build-scripts/oooThesaurusParser.test.ts
@@ -4,7 +4,7 @@ import { extractWordsFromFile } from './oooThesaurusParser.js';
 
 void t.test('extractWordsFromFile', async (t) => {
     const words = await extractWordsFromFile(
-        new URL('../../build-resources/th-en-x-basic.dat', import.meta.url),
+        new URL('../assets/th-en-x-basic.ooo-thesaurus', import.meta.url),
     );
     //console.log(words);
     t.equal(words.length, 24691);
diff --git a/src/build-scripts/viteThesaurusRegexPlugin.test.ts b/src/build-scripts/viteThesaurusRegexPlugin.test.ts
index ec2952b..a860823 100644
--- a/src/build-scripts/viteThesaurusRegexPlugin.test.ts
+++ b/src/build-scripts/viteThesaurusRegexPlugin.test.ts
@@ -4,7 +4,7 @@ import { getRegexStringForThesaurusPath } from './viteThesaurusRegexPlugin.js';
 
 void t.test('extractWordsFromFile', async (t) => {
     const regexString = await getRegexStringForThesaurusPath(
-        new URL('../../build-resources/th-en-x-basic.dat', import.meta.url),
+        new URL('../assets/th-en-x-basic.ooo-thesaurus', import.meta.url),
     );
     const regex = new RegExp(regexString, 'gi');
 
diff --git a/src/build-scripts/viteThesaurusRegexPlugin.ts b/src/build-scripts/viteThesaurusRegexPlugin.ts
index 15491b5..c535966 100644
--- a/src/build-scripts/viteThesaurusRegexPlugin.ts
+++ b/src/build-scripts/viteThesaurusRegexPlugin.ts
@@ -1,10 +1,13 @@
 import type { PathLike } from 'node:fs';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import { Plugin } from 'vite';
 import { extractWordsFromFile } from './oooThesaurusParser.js';
 
-/*type ViteThesaurusRegexPluginOptions = {
-    inputOooThesaurusPath: PathLike;
-    outputRegexPath: string;
-};*/
+type ViteThesaurusRegexPluginOptions = {
+    sourceUrl: URL;
+    thesaurusPath: string;
+};
 
 const WORD_CHARACTER_REGEX_FRAGMENT = "[a-zA-Z']";
 
@@ -17,9 +20,18 @@ export const getRegexStringForThesaurusPath = async (
     )}))`;
 };
 
-/*export const viteThesaurusRegexPlugin = ({
-    inputOooThesaurusPath,
-    outputRegexPath,
-}: ViteThesaurusRegexPluginOptions) => {
-};
-*/
+export const viteThesaurusRegexPlugin = ({
+    thesaurusPath,
+    sourceUrl,
+}: ViteThesaurusRegexPluginOptions): Plugin => ({
+    name: 'vite-thesaurus-regex-plugin',
+    async writeBundle(options) {
+        if (!options.dir) {
+            throw new Error('dir is empty');
+        }
+        const regexString = await getRegexStringForThesaurusPath(
+            new URL(thesaurusPath, sourceUrl),
+        );
+        await fs.writeFile(path.join(options.dir, thesaurusPath), regexString);
+    },
+});
diff --git a/src/index.tsx b/src/index.tsx
index 16b5ec1..2dc4f9c 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,9 +1,15 @@
 import { render } from 'preact';
+import { SpellChecker } from './spellChecker';
 
 import './style.css';
 
 export function App() {
-    return <h1>Hello world</h1>;
+    return (
+        <>
+            <h1>Spell checker</h1>
+            <SpellChecker />
+        </>
+    );
 }
 
 const app = document.getElementById('app');
diff --git a/src/spellChecker/index.tsx b/src/spellChecker/index.tsx
new file mode 100644
index 0000000..5c91954
--- /dev/null
+++ b/src/spellChecker/index.tsx
@@ -0,0 +1,17 @@
+import { useEffect, useState } from 'preact/hooks';
+
+export const SpellChecker = () => {
+    const [regex, setRegex] = useState<string>();
+    useEffect(() => {
+        if (!regex) {
+            setRegex(new URL(`./assets/img/abc.def`, import.meta.url).href);
+        }
+    }, [regex]);
+    return (
+        <section>
+            <textarea rows={10} cols={100}>
+                {regex}
+            </textarea>
+        </section>
+    );
+};
diff --git a/vite.config.ts b/vite.config.ts
index b1ef9e2..fc47bce 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,8 +1,16 @@
 import { defineConfig } from 'vite';
 import preact from '@preact/preset-vite';
+import { viteThesaurusRegexPlugin } from './src/build-scripts/viteThesaurusRegexPlugin';
 
 // https://vitejs.dev/config/
 export default defineConfig({
-	base: './',
-	plugins: [preact()],
+    base: './',
+    assetsInclude: ['**/*.ooo-thesaurus'],
+    plugins: [
+        viteThesaurusRegexPlugin({
+            sourceUrl: new URL('src/', import.meta.url),
+            thesaurusPath: 'assets/th-en-x-basic.ooo-thesaurus',
+        }),
+        preact(),
+    ],
 });