From 891cf135d2fa9c0cfb702d9c56cb36a3361d91e0 Mon Sep 17 00:00:00 2001
From: Alberto Ricart <alberto@synadia.com>
Date: Mon, 28 Aug 2023 15:28:02 -0500
Subject: [PATCH] experimental bundler

---
 bin/bundle.ts | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 bin/bundle.ts

diff --git a/bin/bundle.ts b/bin/bundle.ts
new file mode 100644
index 00000000..ed1955c0
--- /dev/null
+++ b/bin/bundle.ts
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2023 The NATS Authors
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { cli } from "https://deno.land/x/cobra@v0.0.9/mod.ts";
+import { bundle } from "https://deno.land/x/emit@0.26.0/mod.ts";
+
+const root = cli({
+  use: "bundle javascript/typescript",
+  run: async (_cmd, _args, flags) => {
+    const src = flags.value<string>("src");
+    const out = flags.value<string>("out");
+    const type = flags.value<boolean>("module") ? "module" : "classic";
+    try {
+      const r = URL.canParse(src)
+        ? await bundle(new URL(src), { type })
+        : await bundle(src, { type });
+      await Deno.writeTextFile(out, r.code);
+      console.log(`wrote ${out}`);
+      return 0;
+    } catch (err) {
+      console.log(`failed to bundle: ${err.message}`);
+      console.log(err.stack);
+      return 1;
+    }
+  },
+});
+
+root.addFlag({
+  name: "src",
+  type: "string",
+  usage: "input module source path",
+  required: true,
+});
+root.addFlag({
+  name: "out",
+  type: "string",
+  usage: "output bundle path",
+  required: true,
+});
+root.addFlag({
+  name: "module",
+  type: "boolean",
+  usage: "output esm module (default)",
+  default: true,
+});
+
+Deno.exit(await root.execute(Deno.args));