chore: initialize from frontend template 4dc033c

scripts/lib/classify-vite-bundle.ts

@@ -0,0 +1,49 @@
+type ViteManifestEntry = Readonly<{
+  file: string;
+  isEntry?: boolean;
+  imports?: readonly string[];
+}>;
+
+/**
+ * Static imports of an entry are part of initial JavaScript. Every remaining
+ * JavaScript output is governed by the lazy-chunk budget.
+ *
+ */
+export function classifyViteJavascript(
+  manifest: Readonly<Record<string, ViteManifestEntry>>,
+) {
+  const initialFiles = new Set<string>();
+  const visitedKeys = new Set<string>();
+  const pendingKeys = Object.entries(manifest)
+    .filter(([, entry]) => entry.isEntry)
+    .map(([key]) => key);
+  const missingImports: string[] = [];
+
+  while (pendingKeys.length > 0) {
+    const key = pendingKeys.pop();
+    if (key === undefined) break;
+    if (visitedKeys.has(key)) continue;
+    visitedKeys.add(key);
+    const entry = manifest[key];
+    if (!entry) {
+      missingImports.push(key);
+      continue;
+    }
+    if (entry.file.endsWith(".js")) initialFiles.add(entry.file);
+    pendingKeys.push(...(entry.imports ?? []));
+  }
+
+  const allJavaScript = new Set(
+    Object.values(manifest)
+      .map((entry) => entry.file)
+      .filter((file) => file.endsWith(".js")),
+  );
+  const lazyFiles = [...allJavaScript].filter(
+    (file) => !initialFiles.has(file),
+  );
+  return Object.freeze({
+    initialFiles: Object.freeze([...initialFiles].sort()),
+    lazyFiles: Object.freeze(lazyFiles.sort()),
+    missingImports: Object.freeze(missingImports.sort()),
+  });
+}