From 47f1709a3c85a31013a3c4e5e131e722cc4cc39f Mon Sep 17 00:00:00 2001
From: "Michael B. Gale" <mbg@github.com>
Date: Fri, 27 Mar 2026 18:18:08 +0000
Subject: [PATCH] Add basic metadata analysis script

---
 package.json                 |  2 +-
 pr-checks/bundle-metadata.ts | 31 +++++++++++++++++++++++++++++++
 pr-checks/config.ts          |  3 +++
 3 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100755 pr-checks/bundle-metadata.ts

diff --git a/package.json b/package.json
index e4a80d1bd..b76677e46 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "description": "CodeQL action",
   "scripts": {
     "_build_comment": "echo 'Run the full build so we typecheck the project and can reuse the transpiled files in npm test'",
-    "build": "./scripts/check-node-modules.sh && npm run transpile && node build.mjs",
+    "build": "./scripts/check-node-modules.sh && npm run transpile && node build.mjs && npx tsx ./pr-checks/bundle-metadata.ts",
     "lint": "eslint --report-unused-disable-directives --max-warnings=0 .",
     "lint-ci": "SARIF_ESLINT_IGNORE_SUPPRESSED=true eslint --report-unused-disable-directives --max-warnings=0 . --format @microsoft/eslint-formatter-sarif --output-file=eslint.sarif",
     "lint-fix": "eslint --report-unused-disable-directives --max-warnings=0 . --fix",
diff --git a/pr-checks/bundle-metadata.ts b/pr-checks/bundle-metadata.ts
new file mode 100755
index 000000000..1e7585536
--- /dev/null
+++ b/pr-checks/bundle-metadata.ts
@@ -0,0 +1,31 @@
+#!/usr/bin/env npx tsx
+
+import * as fs from "node:fs/promises";
+
+import { BUNDLE_METADATA_FILE } from "./config";
+
+interface Output {
+  bytes: number;
+}
+
+interface Metadata {
+  outputs: Output[];
+}
+
+async function main() {
+  const fileContents = await fs.readFile(BUNDLE_METADATA_FILE);
+  const metadata = JSON.parse(String(fileContents)) as Metadata;
+
+  for (const [outputFile, outputData] of Object.entries(
+    metadata.outputs,
+  ).reverse()) {
+    console.info(
+      `${outputFile}: ${(outputData.bytes / (1024 * 1024)).toFixed(2)}MB`,
+    );
+  }
+}
+
+// Only call `main` if this script was run directly.
+if (require.main === module) {
+  void main();
+}
diff --git a/pr-checks/config.ts b/pr-checks/config.ts
index 7f2826d59..253843f22 100644
--- a/pr-checks/config.ts
+++ b/pr-checks/config.ts
@@ -8,3 +8,6 @@ export const PR_CHECKS_DIR = __dirname;
 
 /** The path of the file configuring which checks shouldn't be required. */
 export const PR_CHECK_EXCLUDED_FILE = path.join(PR_CHECKS_DIR, "excluded.yml");
+
+/** The path to the esbuild metadata file. */
+export const BUNDLE_METADATA_FILE = path.join(PR_CHECKS_DIR, "..", "meta.json");