CommonJS naïve implementation

Author: tshemsedinov

JavaScript/f-commonjs.js

@@ -0,0 +1,29 @@
+'use strict';
+
+const fs = require('node:fs').promises;
+const vm = require('node:vm');
+
+const RUN_OPTIONS = { timeout: 5000, displayErrors: false };
+
+const pseudoRequire = (name) => {
+  console.log(`Intercepted require: ${name}`);
+};
+
+const load = async (filePath, sandbox) => {
+  const src = await fs.readFile(filePath, 'utf8');
+  const code = `(require, module, __filename, __dirname) => {\n${src}\n}`;
+  const script = new vm.Script(code);
+  const context = vm.createContext(Object.freeze({ ...sandbox }));
+  const wrapper = script.runInContext(context, RUN_OPTIONS);
+  const module = {};
+  wrapper(pseudoRequire, module, filePath, __dirname);
+  return module.exports;
+};
+
+const main = async () => {
+  const sandbox = { Map: class PseudoMap {} };
+  const exported = await load('./1-export.js', sandbox);
+  console.log(exported);
+};
+
+main();