Convert to ESM

.github/workflows/check-dist.yml

@@ -26,10 +26,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      # Checkout the repository.
       - name: Checkout
         id: checkout
         uses: actions/checkout@v4
 
+      # Setup Node.js using the version specified in `.node-version`.
       - name: Setup Node.js
         id: setup-node
         uses: actions/setup-node@v4
@@ -37,10 +39,12 @@ jobs:
           node-version-file: .node-version
           cache: npm
 
+      # Install dependencies using `npm ci`.
       - name: Install Dependencies
         id: install
         run: npm ci
 
+      # Build the `dist/` directory.
       - name: Build dist/ Directory
         id: build
         run: npm run bundle