milestone 33: contract closure — samples, file-authority enumeration, dead code, bundle ceiling

admin/scripts/assert-bundle-size.mjs

@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+// The admin bundle is embedded in the server binary and served to a household
+// LAN, so an accidental dependency or a stray asset landing in dist is a
+// regression nobody would otherwise notice: every other gate passes with a
+// bundle twice this size. One number, total bytes of dist/assets — not per
+// chunk, not gzipped — because the failure being caught is "something big
+// arrived", not chunk shape.
+//
+// This runs from admin/ as part of `npm run build`, before stamp-dist: a failed
+// size check must not leave a fresh .src-hash beside an oversized bundle that a
+// later Zig build would accept as current.
+
+import { readdirSync, statSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const BUDGET_BYTES = 800_000;
+
+const distDir = join(dirname(dirname(fileURLToPath(import.meta.url))), "dist", "assets");
+
+let entries;
+try {
+	entries = readdirSync(distDir, { withFileTypes: true });
+} catch (err) {
+	console.error(`assert-bundle-size: cannot read admin/dist/assets: ${err.message}`);
+	process.exit(1);
+}
+
+const files = entries
+	.filter((entry) => entry.isFile())
+	.map((entry) => ({ name: entry.name, bytes: statSync(join(distDir, entry.name)).size }))
+	.sort((a, b) => b.bytes - a.bytes);
+
+if (files.length === 0) {
+	console.error("assert-bundle-size: no files in admin/dist/assets — did the build emit anything?");
+	process.exit(1);
+}
+
+const total = files.reduce((sum, file) => sum + file.bytes, 0);
+const format = (bytes) => bytes.toLocaleString("en-US");
+
+if (total > BUDGET_BYTES) {
+	console.error(
+		`assert-bundle-size: admin/dist/assets is ${format(total)} bytes, over the ${format(BUDGET_BYTES)} byte budget.`,
+	);
+	console.error("Largest chunks:");
+	for (const file of files.slice(0, 5)) console.error(`  ${format(file.bytes).padStart(9)}  ${file.name}`);
+	console.error("Drop what arrived, or raise the budget in this script with the reason in the changelog.");
+	process.exit(1);
+}
+
+console.log(
+	`admin/dist/assets is ${format(total)} bytes across ${files.length} files, ` +
+		`${format(BUDGET_BYTES - total)} under the ${format(BUDGET_BYTES)} byte budget`,
+);