From fee3663b1852585a2790f9e3ef8cd3c713e29873 Mon Sep 17 00:00:00 2001
From: Henry Mercer <henrymercer@github.com>
Date: Thu, 21 Aug 2025 13:34:13 +0100
Subject: [PATCH] Bundle Actions using esbuild

---
 build.mjs         | 38 ++++++++++++++++++++++++++++++++++++++
 eslint.config.mjs |  1 +
 package.json      |  5 ++++-
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 build.mjs

diff --git a/build.mjs b/build.mjs
new file mode 100644
index 000000000..f5205f535
--- /dev/null
+++ b/build.mjs
@@ -0,0 +1,38 @@
+import { rm } from "node:fs/promises";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+import * as esbuild from "esbuild";
+import { globSync } from "glob";
+import { typecheckPlugin } from "@jgoz/esbuild-plugin-typecheck";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const OUT_DIR = "lib";
+
+await rm(join(__dirname, OUT_DIR), { recursive: true, force: true });
+
+// This will just log when a build ends
+/** @type {esbuild.Plugin} */
+const onEndPlugin = {
+  name: "on-end",
+  setup(build) {
+    build.onEnd((result) => {
+      // eslint-disable-next-line no-console
+      console.log(`Build ended with ${result.errors.length} errors`);
+    });
+  },
+};
+
+const context = await esbuild.context({
+  entryPoints: globSync(["src/*-action.ts", "src/*-action-post.ts"]),
+  bundle: true,
+  format: "cjs",
+  outdir: OUT_DIR,
+  platform: "node",
+  plugins: [typecheckPlugin(), onEndPlugin],
+});
+
+await context.rebuild();
+await context.dispose();
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 0c06089d6..7b9f2e6f5 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -29,6 +29,7 @@ export default [
       "lib/**/*",
       "src/testdata/**/*",
       "tests/**/*",
+      "build.mjs",
       "eslint.config.mjs",
       ".github/**/*",
     ],
diff --git a/package.json b/package.json
index 81648b9ce..9c454bc49 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "private": true,
   "description": "CodeQL action",
   "scripts": {
-    "build": "tsc --build",
+    "build": "node build.mjs",
     "test": "ava src/**.test.ts --serial --verbose",
     "test-debug": "ava src/**.test.ts --serial --verbose --timeout=20m",
     "lint": "eslint --report-unused-disable-directives --max-warnings=0 .",
@@ -61,6 +61,7 @@
     "@eslint/compat": "^1.3.2",
     "@eslint/eslintrc": "^3.3.1",
     "@eslint/js": "^9.33.0",
+    "@jgoz/esbuild-plugin-typecheck": "^4.0.3",
     "@microsoft/eslint-formatter-sarif": "^3.1.0",
     "@types/archiver": "^6.0.3",
     "@types/console-log-level": "^1.4.5",
@@ -73,12 +74,14 @@
     "@typescript-eslint/eslint-plugin": "^8.40.0",
     "@typescript-eslint/parser": "^8.40.0",
     "ava": "^6.4.1",
+    "esbuild": "^0.25.9",
     "eslint": "^8.57.1",
     "eslint-import-resolver-typescript": "^3.8.7",
     "eslint-plugin-filenames": "^1.3.2",
     "eslint-plugin-github": "^5.1.8",
     "eslint-plugin-import": "2.29.1",
     "eslint-plugin-no-async-foreach": "^0.1.1",
+    "glob": "^11.0.3",
     "nock": "^14.0.10",
     "removeNPMAbsolutePaths": "3.0.1",
     "sinon": "^21.0.0",