Node.js async eval that accepts a context object with code and returns `util.inspect` of the result or the stringified error, along with stdout and stderr - acts exactly like Node.js REPL

eval.js

const events = require("node:events");
const stream = require("node:stream");
const repl = require("node:repl");

/**
 * @param {object} contextObject
 * @param {string} code
 * @returns {Promise<string>}
 */
async function executeAsyncCode(contextObject, code) {
  let output = "";
  const replServer = repl.start({
    prompt: "",
    input: stream.Readable.from([code], {
      highWaterMark: 0,
    }),
    output: new stream.Writable({
      highWaterMark: 0,
      decodeStrings: false,
      write(chunk, _encoding, callback) {
        output += chunk;
        callback();
      },
    }),
    terminal: false,
  });

  for (const [key, value] of Object.entries(contextObject)) {
    replServer.context[key] = value;
  }

  await events.once(replServer, "exit");
  return output.slice(0, -1);
}

examples.js

await executeAsyncCode({}, "42"); // '42'
await executeAsyncCode({}, "42;"); // '42'
await executeAsyncCode({}, "console.log('test')"); // 'test\nundefined'
await executeAsyncCode({}, "console.log('test'); await new Promise(resolve => { resolve(42); })"); // 'test\n42'
await executeAsyncCode({}, "new Error('error')"); /*
 * 'Error: error\n' +
 * '    at REPL1:1:1\n' +
 * '    at Script.runInContext (node:vm:140:12)\n' +
 * '    at REPLServer.defaultEval (node:repl:572:29)\n' +
 * '    at bound (node:domain:433:15)\n' +
 * '    at REPLServer.runBound [as eval] (node:domain:444:12)\n' +
 * '    at REPLServer.onLine (node:repl:900:10)\n' +
 * '    at REPLServer.emit (node:events:513:28)\n' +
 * '    at REPLServer.emit (node:domain:489:12)\n' +
 * '    at Readable.onend (node:internal/readline/interface:258:12)\n' +
 * '    at Readable.emit (node:events:513:28)'
 */