Waiting on tcp ports doesn't work in Node 18

[paulsmithkc]

We ran into an issue with Node 18, were wait-on would wait indefinitely for a service to start, even though it was already started.

Environment:

• Bitbucket Pipeline
• Node 18 image
• Azure Function App

Test Script:

concurrently -k -s first \"wait-on tcp:7071 --timeout=60000 && jest --forceExit\" \"azurite\" \"func start\"

Bitbucket Pipeline:

image: node:18

pipelines:
  default:
    - step:
        name: Test
        caches:
          - node
        script:
          - npm install
          - npm i --location=global azure-functions-core-tools@4
          - npm i --location=global azurite@latest
          - export FUNCTIONS_WORKER_RUNTIME="node"
          - export APPINSIGHTS_INSTRUMENTATIONKEY=""
          - export AzureWebJobsStorage="UseDevelopmentStorage=true"
          - npm run test

We ended up downgrading the Bitbucket Pipeline to Node 16, to make it work for now.

[PilotConway]

I just ran into this as well on my local machine. Running node 18 on a M1 Macbook Pro. Downgrading to 16 also worked to get around it.

[metcoder95]

Did tried using explicitly 127.0.0.1?

[BrunoBernardino]

I just ran into this as well, on M1 Macbook Air, and GitHub actions CI on Ubuntu 20.04 (but not on my local Linux machine, running a variant of Ubuntu 22.04).

Using tcp:127.0.0.1:PORT did work, but not http://localhost:PORT nor tcp:localhost:PORT, so it seems related to localhost and not the protocol.

[BrunoBernardino]

So, turns out that's not exactly the issue. wait-on seems to be working fine, and I can get tcp:localhost:PORT to work, as long as that program is listening on ipv6. This is because Node changed the ipv4 preference to ipv6 from 17+.

The solution is to make those apps listen in ipv6 or wait for them on 127.0.0.1 instead (explicit ipv4).

Reference links:

• https://stackoverflow.com/questions/72648487/node-js-16-17-changed-resolution-of-localhost
• dns: default to verbatim=true in dns.lookup() nodejs/node#39987
• "localhost" favours IPv6 in node v17, used to favour IPv4 nodejs/node#40537

Have fun digging into those!