refactor: restructure repo layout

llm-functions/tools/execute_js_code.js

@@ -0,0 +1,22 @@
+/**
+ * Execute the javascript code in node.js.
+ * @typedef {Object} Args
+ * @property {string} code - Javascript code to execute, such as `console.log("hello world")`
+ * @param {Args} args
+ */
+exports.run = function ({ code }) {
+  let output = "";
+  const oldStdoutWrite = process.stdout.write.bind(process.stdout);
+  process.stdout.write = (chunk, _encoding, callback) => {
+    output += chunk;
+    if (callback) callback();
+  };
+
+  const value = eval(code);
+  if (value !== undefined) {
+    output += value;
+  }
+
+  process.stdout.write = oldStdoutWrite;
+  return output;
+}