Quickstart fails with "Top-level await currently not supported" error

[stringbeans]

While following the quickstart guide here:

https://langchain-ai.github.io/langgraphjs/tutorials/quickstart/#making-your-first-agent-using-langgraph

Following the guide exactly, and using Node v22.9.0, I get the following error after running npx tsx agent.ts:

node:internal/modules/run_main:123
    triggerUncaughtException(
    ^
Error: Transform failed with 2 errors:
/home/john/Development/langgraph-agent/agent.ts:26:24: ERROR: Top-level await is currently not supported with the "cjs" output format
/home/john/Development/langgraph-agent/agent.ts:35:23: ERROR: Top-level await is currently not supported with the "cjs" output format
    at failureErrorWithLog (/home/john/Development/langgraph-agent/node_modules/esbuild/lib/main.js:1476:15)
    at /home/john/Development/langgraph-agent/node_modules/esbuild/lib/main.js:755:50
    at responseCallbacks.<computed> (/home/john/Development/langgraph-agent/node_modules/esbuild/lib/main.js:622:9)
    at handleIncomingPacket (/home/john/Development/langgraph-agent/node_modules/esbuild/lib/main.js:677:12)
    at Socket.readFromStdout (/home/john/Development/langgraph-agent/node_modules/esbuild/lib/main.js:600:7)
    at Socket.emit (node:events:519:28)
    at addChunk (node:internal/streams/readable:561:12)
    at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)
    at Readable.push (node:internal/streams/readable:392:5)
    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23) {
  name: 'TransformError'
}

Node.js v22.9.0

The error is simple to fix by restructuring the code to not use top-level awaits, but yeah... in the current state its not working if a user follows the examples as-is.

[jacoblee93]

Yeah, suppose we should specify .mts or say that you should use ESM, thanks for flagging

[dwabyick]

I hit the same issue.