Add Babel to fix Node <14 compat

cli/lib/autojson-plugin.js

@@ -0,0 +1,12 @@
+import { promises as fsp } from 'fs';
+
+export default function autojsonPlugin() {
+  return {
+    name: 'autojson-plugin',
+    async load(id) {
+      if (id.endsWith('.json') && !id.startsWith('json:')) {
+        return 'export default ' + await fsp.readFile(id, 'utf8');
+      }
+    }
+  };
+};

cli/lib/json-plugin.js

@@ -4,7 +4,7 @@ const prefix = "json:";
 
 const reservedKeys = ["public"];
 
-export default function ejsAssetPlugin() {
+export default function jsonPlugin() {
   return {
     name: "json-plugin",
     async resolveId(id, importer) {

cli/package.json

@@ -17,6 +17,9 @@
     "web-streams-polyfill": "^3.0.0"
   },
   "devDependencies": {
+    "@babel/core": "^7.11.6",
+    "@babel/preset-env": "^7.11.5",
+    "@rollup/plugin-babel": "^5.2.1",
     "@rollup/plugin-commonjs": "^15.0.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
     "commander": "^6.0.0",

cli/rollup.config.js

@@ -1,10 +1,13 @@
 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";
+import autojson from "./lib/autojson-plugin.js";
+import { getBabelOutputPlugin } from '@rollup/plugin-babel';
+import { builtinModules } from 'module';
 
-export default {
+/** @type {import('rollup').RollupOptions} */
+export default ({
   input: "src/index.js",
   output: {
     dir: "build",
@@ -18,19 +21,22 @@ export default {
     resolve(),
     cjs(),
     asset(),
+    autojson(),
     json(),
-    null &&
-      terser({
-        mangle: true
-      })
+    getBabelOutputPlugin({
+      babelrc: false,
+      configFile: false,
+      minified: true,
+      comments: false,
+      presets: [
+        ['@babel/preset-env', {
+          targets: {
+            node: 12
+          },
+          loose: true
+        }]
+      ]
+    })
   ],
-  external: [
-    "os",
-    "path",
-    "fs",
-    "worker_threads",
-    "events",
-    "child_process",
-    "crypto"
-  ]
-};
+  external: builtinModules
+});