diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index aebd6eb..35a7c15 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,27 +5,49 @@ name: Build
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [12.x, 14.x, 16.x]
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
-
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
-      with:
-        node-version: ${{ matrix.node-version }}
-        cache: 'npm'
-    - run: npm ci
-    - run: npm run build
-    - run: npm test
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        name: Install pnpm
+        with:
+          version: 8
+          run_install: false
+
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
+
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - uses: actions/cache@v4
+        name: Setup pnpm cache
+        with:
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Lint
+        run: pnpm run lint
+
+      - name: Typecheck
+        run: pnpm run typecheck
diff --git a/src/specialAssign.ts b/src/specialAssign.ts
deleted file mode 100644
index e506c7f..0000000
--- a/src/specialAssign.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-export default function specialAssign(a, b, reserved) {
-  reserved = reserved || {};
-  // This will get id, className, style, etc.
-  for (var x in b) {
-    if (!Object.prototype.hasOwnProperty.call(b, x)) continue;
-    if (reserved[x]) continue;
-    a[x] = b[x];
-  }
-}
diff --git a/webpack-demo.config.js b/webpack-demo.config.js
deleted file mode 100644
index 71c43a7..0000000
--- a/webpack-demo.config.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const path = require("path");
-
-module.exports = {
-  entry: {
-    demo: "./demo/js/index.js"
-  },
-  output: {
-    path: path.join(__dirname, "demo"),
-    filename: "demo-bundle.js"
-  },
-  module: {
-    rules: [{ test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" }]
-  }
-};
diff --git a/webpack-umd.config.js b/webpack-umd.config.js
deleted file mode 100644
index b088bf6..0000000
--- a/webpack-umd.config.js
+++ /dev/null
@@ -1,35 +0,0 @@
-const path = require("path");
-
-const filename = process.env.MINIFY
-  ? "ReactAriaMenuButton.min.js"
-  : "ReactAriaMenuButton.js";
-
-module.exports = {
-  entry: {
-    AriaMenuButton: "./src/index.js"
-  },
-  output: {
-    library: "ReactAriaMenuButton",
-    libraryTarget: "umd",
-    path: path.join(__dirname, "umd"),
-    filename: filename
-  },
-  externals: [
-    {
-      react: {
-        root: "React",
-        commonjs2: "react",
-        commonjs: "react",
-        amd: "react"
-      }
-    },
-  ],
-  module: {
-    rules: [{ test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" }]
-  },
-  node: {
-    Buffer: false,
-    process: false,
-    setImmediate: false
-  }
-};