Implement it.

.github/workflows/main.yaml

@@ -0,0 +1,43 @@
+on:
+  push:
+  pull_request:
+
+name: CI
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v4
+      - name: Install and build
+        run: |
+          npm ci
+          npm run build
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist/
+      - name: Disable Jekyll
+        run: |
+          touch dist/.nojekyll
+      - name: Publish artifact
+        if: "${{ github.event_name == 'push' && github.event.ref == 'refs/heads/main' }}"
+        uses: JamesIves/github-pages-deploy-action@releases/v4
+        with:
+          folder: dist/

build.mjs

@@ -0,0 +1,55 @@
+import * as process from 'node:process';
+import * as esbuild from 'esbuild';
+import metaUrlPlugin from '@chialab/esbuild-plugin-meta-url';
+
+const mode = (process.argv[2] ?? 'build');
+const options = {
+    logLevel: 'info',
+    plugins: [metaUrlPlugin()],
+    bundle: true,
+    loader: {
+        '.html': 'copy',
+        '.svg': 'dataurl',
+        '.ttf': 'file',
+        '.woff': 'file',
+        '.woff2': 'file',
+        '.json': 'file',
+        '.wasm': 'file',
+        '.asm.wasm': 'copy',
+        '.zip': 'file',
+    },
+    external: [
+        'fs/promises', // @yowasp/yosys
+        'node-fetch', // pyodide
+    ],
+    define: {
+        'globalThis.IS_PRODUCTION': (mode === 'minify' ? 'true' : 'false'),
+    },
+    target: 'es2021',
+    format: 'esm',
+    sourcemap: 'linked',
+    minify: (mode === 'minify'),
+    outdir: 'dist',
+    entryPoints: {
+        'index': './src/index.html',
+        'app': './src/app.tsx',
+        'app.worker': './src/worker.ts',
+        'editor.worker': 'monaco-editor/esm/vs/editor/editor.worker.js',
+        'pyodide.asm': 'pyodide/pyodide.asm.wasm',
+    },
+};
+
+if (mode === 'build' || mode === 'minify') {
+    await esbuild.build(options);
+} else if (mode === 'watch') {
+    const context = await esbuild.context(options);
+    await context.watch();
+} else if (mode === 'serve') {
+    const context = await esbuild.context(options);
+    await context.rebuild();
+    await context.watch();
+    // Specifying `servedir` is necessary for files built by meta URL plugin to be accessible.
+    await context.serve({ servedir: 'dist' });
+} else {
+    console.error(`Usage: ${process.argv0} [build|watch|serve|minify]`);
+}