Stream code output

runCode and run_code can deliver output before execution finishes. Use separate callbacks for standard output, standard error, and structured results.

const sandbox = await Sandbox.create("code-interpreter");

try {
  await sandbox.runCode(
    "import sys\nprint('first')\nprint('warning', file=sys.stderr)\n6 * 7",
    {
      onStdout: (message) => console.log(`stdout: ${message.line}`),
      onStderr: (message) => console.log(`stderr: ${message.line}`),
      onResult: (result) => console.log(`result: ${result.text}`),
    },
  );
} finally {
  await sandbox.kill();
}

The returned execution object still contains all logs, results, and execution errors after the stream ends. Callbacks are useful when you want to show progress immediately; use the returned object when you need the complete record.

See the JavaScript reference or Python reference for all callback and timeout options.