diff --git a/package.json b/package.json
index ee343fbe..d7a3328b 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,8 @@
   "scripts": {
     "dev": "bunx --bun astro dev",
     "build": "bunx --bun astro build",
-    "build:lib": "bun scripts/index.js",
-    "package": "bun scripts/npm-package.js",
+    "build:lib": "bun scripts/index.ts",
+    "package": "bun scripts/npm-package.ts",
     "test:unit": "bun test tests/*.ts",
     "test:e2e": "playwright test",
     "format": "bunx --bun prettier --write .",
diff --git a/scripts/build-languages.js b/scripts/build-languages.ts
similarity index 85%
rename from scripts/build-languages.js
rename to scripts/build-languages.ts
index d2b7eb41..f8182a0d 100644
--- a/scripts/build-languages.js
+++ b/scripts/build-languages.ts
@@ -1,9 +1,9 @@
-// @ts-check
 import hljs from "highlight.js";
-import { createMarkdown } from "./utils/create-markdown.js";
-import { mkdir } from "./utils/fs.js";
-import { toCamelCase } from "./utils/to-pascal-case.js";
-import { writeTo } from "./utils/write-to.js";
+import { createMarkdown } from "./utils/create-markdown";
+import { mkdir } from "./utils/fs";
+import { toCamelCase } from "./utils/to-pascal-case";
+import { writeTo } from "./utils/write-to";
+import type { ModuleNames } from "./build-styles";
 
 export async function buildLanguages() {
   console.time("build languages");
@@ -20,8 +20,7 @@ export async function buildLanguages() {
     register: LanguageFn;
   }\n\n`;
 
-  /** @type {import("./build-styles").ModuleNames} */
-  let lang = [];
+  let lang: ModuleNames = [];
 
   languages.forEach(async (name) => {
     let moduleName = name;
diff --git a/scripts/build-styles.js b/scripts/build-styles.ts
similarity index 87%
rename from scripts/build-styles.js
rename to scripts/build-styles.ts
index 75dc8c1a..c3fec1ff 100644
--- a/scripts/build-styles.js
+++ b/scripts/build-styles.ts
@@ -1,27 +1,20 @@
-// @ts-check
-import path from "path";
+import path from "node:path";
 import { totalist } from "totalist";
-import { createMarkdown } from "./utils/create-markdown.js";
-import { copyFile, mkdir, readFile } from "./utils/fs.js";
-import { minifyCss } from "./utils/minify-css.js";
-import { toCamelCase } from "./utils/to-pascal-case.js";
-import { writeTo } from "./utils/write-to.js";
+import { createMarkdown } from "./utils/create-markdown";
+import { copyFile, mkdir, readFile } from "./utils/fs";
+import { minifyCss } from "./utils/minify-css";
+import { toCamelCase } from "./utils/to-pascal-case";
+import { writeTo } from "./utils/write-to";
 
-/**
- * @typedef {Array<{ name: string; moduleName: string; }>} ModuleNames
- */
+export type ModuleNames = Array<{ name: string; moduleName: string }>;
 
 export async function buildStyles() {
   console.time("build styles");
   mkdir("src/styles");
 
   let scoped_styles = "";
-
-  /** @type {string[]} */
-  let names = [];
-
-  /** @type {ModuleNames} */
-  let styles = [];
+  let names: string[] = [];
+  let styles: ModuleNames = [];
 
   await totalist("node_modules/highlight.js/styles", async (file, absPath) => {
     /**
diff --git a/scripts/index.js b/scripts/index.js
deleted file mode 100644
index 13167b85..00000000
--- a/scripts/index.js
+++ /dev/null
@@ -1,11 +0,0 @@
-// @ts-check
-import { buildLanguages } from "./build-languages.js";
-import { buildStyles } from "./build-styles.js";
-import { mkdir } from "./utils/fs.js";
-
-(async () => {
-  mkdir("www/data");
-
-  await buildLanguages();
-  await buildStyles();
-})();
diff --git a/scripts/index.ts b/scripts/index.ts
new file mode 100644
index 00000000..ed1118e7
--- /dev/null
+++ b/scripts/index.ts
@@ -0,0 +1,10 @@
+import { buildLanguages } from "./build-languages";
+import { buildStyles } from "./build-styles";
+import { mkdir } from "./utils/fs";
+
+(async () => {
+  mkdir("www/data");
+
+  await buildLanguages();
+  await buildStyles();
+})();
diff --git a/scripts/npm-package.js b/scripts/npm-package.ts
similarity index 87%
rename from scripts/npm-package.js
rename to scripts/npm-package.ts
index 98c78dbe..8d2b187b 100644
--- a/scripts/npm-package.js
+++ b/scripts/npm-package.ts
@@ -1,15 +1,14 @@
-// @ts-check
 import fs from "node:fs";
-import { copyFile, mkdir, writeFile } from "./utils/fs.js";
+import { mkdir, writeFile } from "./utils/fs";
 
 async function npmPackage() {
   console.time("package");
 
   mkdir("./package");
 
-  await copyFile("./package.json", "./package/package.json");
-  await copyFile("./README.md", "./package/README.md");
-  await copyFile("./LICENSE", "./package/LICENSE");
+  await Bun.write("./package/package.json", Bun.file("./package.json"));
+  await Bun.write("./package/README.md", Bun.file("./README.md"));
+  await Bun.write("./package/LICENSE", Bun.file("./LICENSE"));
 
   // Copy source folder to package
   mkdir("./package/src");
diff --git a/scripts/utils/create-markdown.js b/scripts/utils/create-markdown.ts
similarity index 58%
rename from scripts/utils/create-markdown.js
rename to scripts/utils/create-markdown.ts
index de2680c9..6a7dbef7 100644
--- a/scripts/utils/create-markdown.js
+++ b/scripts/utils/create-markdown.ts
@@ -1,15 +1,11 @@
-// @ts-check
 import fs from "node:fs";
 
 const pkg = JSON.parse(
   fs.readFileSync(new URL("../../package.json", import.meta.url), "utf8"),
 );
 
-/**
- * Creates header metadata for supported languages/styles
- * @type {(type: "Languages" | "Styles", len: number) => string}
- */
-export const createMarkdown = (type, len) =>
+/** Creates header metadata for supported languages/styles */
+export const createMarkdown = (type: "Languages" | "Styles", len: number) =>
   `
 # Supported ${type}
 
diff --git a/scripts/utils/fs.js b/scripts/utils/fs.ts
similarity index 73%
rename from scripts/utils/fs.js
rename to scripts/utils/fs.ts
index a6e05518..34c2eaaa 100644
--- a/scripts/utils/fs.js
+++ b/scripts/utils/fs.ts
@@ -1,9 +1,7 @@
-// @ts-check
 import fs from "node:fs";
 import fsp from "node:fs/promises";
 
-/** @type {(dir: string, noRemove?: boolean) => void} */
-export const mkdir = (dir) => {
+export const mkdir = (dir: string) => {
   if (fs.existsSync(dir)) {
     fs.rmSync(dir, { recursive: true });
   }
diff --git a/scripts/utils/index.js b/scripts/utils/index.js
deleted file mode 100644
index ed838df1..00000000
--- a/scripts/utils/index.js
+++ /dev/null
@@ -1,4 +0,0 @@
-// @ts-check
-export { createMarkdown } from "./create-markdown.js";
-export { toCamelCase } from "./to-pascal-case.js";
-export { writeTo } from "./write-to.js";
diff --git a/scripts/utils/index.ts b/scripts/utils/index.ts
new file mode 100644
index 00000000..983826c3
--- /dev/null
+++ b/scripts/utils/index.ts
@@ -0,0 +1,3 @@
+export { createMarkdown } from "./create-markdown";
+export { toCamelCase } from "./to-pascal-case";
+export { writeTo } from "./write-to";
diff --git a/scripts/utils/minify-css.js b/scripts/utils/minify-css.js
deleted file mode 100644
index a5ae689b..00000000
--- a/scripts/utils/minify-css.js
+++ /dev/null
@@ -1,13 +0,0 @@
-// @ts-check
-import cssnano from "cssnano";
-import litePreset from "cssnano-preset-lite";
-import postcss from "postcss";
-
-/** @type {(css: string, discardComments?: import('cssnano-preset-lite').Options['discardComments']) => string} */
-export const minifyCss = (css, discardComments = false) => {
-  const preset = litePreset({
-    discardComments,
-  });
-
-  return postcss([cssnano({ preset })]).process(css).css;
-};
diff --git a/scripts/utils/minify-css.ts b/scripts/utils/minify-css.ts
new file mode 100644
index 00000000..4b771c06
--- /dev/null
+++ b/scripts/utils/minify-css.ts
@@ -0,0 +1,12 @@
+import cssnano from "cssnano";
+import litePreset, { type LiteOptions } from "cssnano-preset-lite";
+import postcss from "postcss";
+
+export const minifyCss = (
+  css: string,
+  discardComments?: LiteOptions["discardComments"],
+) => {
+  return postcss([
+    cssnano({ preset: litePreset({ discardComments }) }),
+  ]).process(css).css;
+};
diff --git a/scripts/utils/to-pascal-case.js b/scripts/utils/to-pascal-case.ts
similarity index 79%
rename from scripts/utils/to-pascal-case.js
rename to scripts/utils/to-pascal-case.ts
index 7eee753d..aded20d6 100644
--- a/scripts/utils/to-pascal-case.js
+++ b/scripts/utils/to-pascal-case.ts
@@ -1,11 +1,9 @@
-// @ts-check
 /**
- * @type {(str: string) => string}
  * Converts a dash/period separated string into pascal case
  * @example
  * "one-two-three" --> "oneTwoThree"
  */
-export const toCamelCase = (str) =>
+export const toCamelCase = (str: string) =>
   str
     .split(new RegExp(/-|\./g))
     .map((fragment, index) => {
diff --git a/scripts/utils/write-to.js b/scripts/utils/write-to.js
deleted file mode 100644
index 39802a36..00000000
--- a/scripts/utils/write-to.js
+++ /dev/null
@@ -1,24 +0,0 @@
-// @ts-check
-import path from "path";
-import prettier from "prettier";
-import { writeFile } from "./fs.js";
-
-const { format } = prettier;
-
-/** @type {Record<string, import ("prettier").BuiltInParserName>} */
-const PARSER = {
-  ".md": "markdown",
-  ".js": "babel",
-  ".ts": "typescript",
-  ".json": "json",
-  ".css": "css",
-};
-
-/** @type {(file: string, source: object | string) => Promise<void>} */
-export async function writeTo(file, source) {
-  const value =
-    typeof source === "string" ? source : JSON.stringify(source, null, 2);
-  const parser = PARSER[path.parse(file).ext];
-
-  await writeFile(file, await format(value, { parser }));
-}
diff --git a/scripts/utils/write-to.ts b/scripts/utils/write-to.ts
new file mode 100644
index 00000000..808304f9
--- /dev/null
+++ b/scripts/utils/write-to.ts
@@ -0,0 +1,21 @@
+import path from "node:path";
+import prettier, { type BuiltInParserName } from "prettier";
+import { writeFile } from "./fs";
+
+const PARSER: Record<string, BuiltInParserName> = {
+  ".md": "markdown",
+  ".js": "babel",
+  ".ts": "typescript",
+  ".json": "json",
+  ".css": "css",
+};
+
+export async function writeTo(file: string, source: string | object) {
+  const value =
+    typeof source === "string" ? source : JSON.stringify(source, null, 2);
+  const parser = PARSER[path.parse(file).ext];
+
+  if (!parser) throw new Error(`No parser found for ${file}`);
+
+  await writeFile(file, await prettier.format(value, { parser }));
+}
diff --git a/tsconfig.json b/tsconfig.json
index d2eae215..2ca0e5f8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,5 +13,5 @@
       "svelte-highlight/*": ["./src/*"]
     }
   },
-  "include": ["src/**/*", "www/**/*", "tests/**/*"]
+  "include": ["src/**/*", "www/**/*", "tests/**/*", "scripts/**/*"],
 }