feat: improve execute js/py code and collect results (#117)

tools/execute_js_code.js

@@ -1,3 +1,5 @@
+const vm = require('vm');
+
 /**
  * Execute the javascript code in node.js.
  * @typedef {Object} Args
@@ -5,5 +7,7 @@
  * @param {Args} args
  */
 exports.run = function run({ code }) {
-  return eval(code);
+  const context = vm.createContext({});
+  const script = new vm.Script(code);
+  return script.runInContext(context);
 }

tools/execute_py_code.py

@@ -3,4 +3,4 @@ def run(code: str):
     Args:
         code: Python code to execute, such as `print("hello world")`
     """
-    return exec(code)
+    return eval(code)