Rollup for proper CLI

cli/rollup.config.js

@@ -0,0 +1,32 @@
+import resolve from "@rollup/plugin-node-resolve";
+import cjs from "@rollup/plugin-commonjs";
+import { terser } from "rollup-plugin-terser";
+import asset from "./lib/asset-plugin.js";
+import json from "./lib/json-plugin.js";
+
+export default {
+  input: "src/index.js",
+  output: {
+    dir: "build",
+    format: "cjs",
+    assetFileNames: "[name]-[hash][extname]"
+  },
+  plugins: [
+    resolve(),
+    cjs(),
+    asset(),
+    json(),
+    terser({
+      mangle: true
+    })
+  ],
+  external: [
+    "os",
+    "path",
+    "fs",
+    "worker_threads",
+    "events",
+    "child_process",
+    "crypto"
+  ]
+};