implement recommendations in nodejs/node#44859

package.json

@@ -18,7 +18,7 @@
     "devops"
   ],
   "engines": {
-    "node": ">=14"
+    "node": ">=16"
   },
   "repository": {
     "type": "git",
@@ -27,7 +27,7 @@
   "bugs": {
     "url": "https://github.com/rockcarver/frodo-cli/issues"
   },
-  "main": "esm/app.js",
+  "main": "esm/launch.js",
   "scripts": {
     "test": "npx tsc && node --experimental-vm-modules node_modules/jest/bin/jest.js",
     "test:local": "npm run build && node --experimental-vm-modules node_modules/jest/bin/jest.js",
@@ -78,7 +78,7 @@
   ],
   "license": "MIT",
   "bin": {
-    "frodo": "./esm/app.js"
+    "frodo": "./esm/launch.js"
   },
   "babel": {
     "plugins": [

src/app.ts

@@ -1,5 +1,3 @@
-#!/usr/bin/env -S node --no-warnings --enable-source-maps --experimental-specifier-resolution=node
-
 import { ConnectionProfile } from '@rockcarver/frodo-lib';
 import { Command } from 'commander';
 

src/launch.ts

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+import { spawn } from 'node:child_process';
+import { createRequire } from 'module';
+
+const require = createRequire(import.meta.url);
+
+const launchArgs = [
+  '--no-warnings',
+  '--enable-source-maps',
+  '--experimental-loader',
+  require.resolve('./loader.js'),
+  require.resolve('./app.js'),
+];
+const frodoArgs = process.argv.slice(2);
+
+spawn(process.execPath, [...launchArgs, ...frodoArgs], {
+  stdio: 'inherit',
+  shell: false,
+});

src/loader.ts

@@ -0,0 +1,44 @@
+import { builtinModules } from 'node:module';
+import { dirname } from 'path';
+import { cwd } from 'process';
+import { fileURLToPath, pathToFileURL } from 'url';
+import { promisify } from 'util';
+
+import resolveCallback from 'resolve/async.js';
+
+const resolveAsync = promisify(resolveCallback);
+
+const baseURL = pathToFileURL(cwd() + '/').href;
+
+export async function resolve(specifier, context, next) {
+  const { parentURL = baseURL } = context;
+
+  if (specifier.startsWith('node:') || builtinModules.includes(specifier)) {
+    return next(specifier, context);
+  }
+
+  // `resolveAsync` works with paths, not URLs
+  if (specifier.startsWith('file://')) {
+    specifier = fileURLToPath(specifier);
+  }
+  const parentPath = fileURLToPath(parentURL);
+
+  let url;
+  try {
+    const resolution = await resolveAsync(specifier, {
+      basedir: dirname(parentPath),
+      // For whatever reason, --experimental-specifier-resolution=node doesn't search for .mjs extensions
+      // but it does search for index.mjs files within directories
+      extensions: ['.js', '.json', '.node', '.mjs'],
+    });
+    url = pathToFileURL(resolution).href;
+  } catch (error) {
+    if (error.code === 'MODULE_NOT_FOUND') {
+      // Match Node's error code
+      error.code = 'ERR_MODULE_NOT_FOUND';
+    }
+    throw error;
+  }
+
+  return next(url, context);
+}