[0.55.0] Metro Bundler can't listen on port undefined

[ASteinheiser]

• [x] I have reviewed the documentation
• [x] I am using the latest React Native version
• [x] I have searched existing issues

  I am following up on closed issue #18673. This still seems to be an issue. Here's a screenshot of what I'm experiencing. Is there something I am missing?

Environment

OS: macOS High Sierra 10.13.3 Node: 7.9.0 Yarn: Not Found npm: 4.2.0 Watchman: 4.9.0 Xcode: Xcode 9.3 Build version 9E145 Android Studio: 3.1 AI-173.4670197

Packages: (wanted => installed) react: 16.3.0 => 16.3.0 react-native: 0.55.0 => 0.55.0

Steps to Reproduce

react-native init AwesomeProject
cd AwesomeProject
react-native run-ios

Expected Behavior

Build Successful!

Actual Behavior

Metro Bundler can't listen on port undefined

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[ASteinheiser]

Can confirm that using react-native: 0.52.2 fixed this issue for me.

[leofontes]

This is happening to me too, 0.52.2 with React 16.2.0 fixed it.

[zen0wu]

Apparently this is related to #18525, that issue fixes device but simulator is still broken, because port is not passed into buildProject.

https://github.com/facebook/react-native/blob/master/local-cli/runIOS/runIOS.js#L130

Adding args.port as the last argument to this function call should temporarily fix the issue

[kaushal9678]

after updating npm i also get error when running command react-native init-ios. React Native 0.55.0 CFBundleIdentifier error after fixing metro port But the projects that are created with lower version is works fine without any error.

I have following versions of NPM, react-native, node js react-native-cli: 2.0.1 react-native: 0.55.0, I downgrade NPM version to this npm 3.10.10 node -verison v6.14.1

[wouterds]

@shivawu That patch is already included in RN 0.55, it does not fix the issue. It did work on 0.54.4.

[hatlestad]

I am experiencing the same issue with 0.55.0.

[donjordano]

Same here!

[kelset]

First off, PLEASE don't pollute the issue with useless 'same issue' comments.

There are the reactions for indicating that this issue is present.

That said, please don't use 0.55.0 because it ships with the wrong version of React. We are going to release soon a new version.

[grabbou]

I believe we need to fix this as soon as possible - @kitze was reporting this to me yesterday. I will take a closer look before releasing a new version.

[zen0wu]

@wouterds if you read through my comment, I provided another fix for this current problem, that issue is only a reference

[zen0wu]

I have to say the release process has been very carelessly, recently.

• With 0.55, it’s this and the wrong dependency on react itself.
• With 0.54 it’s #18175 and #18223.
• With 0.53, not really react-native fault, but it’s https://github.com/oblador/react-native-vector-icons/issues/626.

Each major release has flaws that makes it unusable. Especially with 0.54 and 0.55. I always have postinstall script setup to fix react-native. Feel like it’s SEV worthy and time to revise the process

[hramos]

@shivawu the release spends around a month as a release candidate. That's a great time to give the RC a try and surface any issues, prior to the stable release being cut.

[zen0wu]

I’m aware of the Rc version and really appreciated the effort. Yet these seems-easy-to-discover bugs slipped through into the stable release, just saying there seems the process can be improved

[hramos]

Definitely. Beefing up our test suite is another way of contributing a solution to this. I'd appreciate any PRs in that area.

[wouterds]

@shivawu: No, we're talking about the same issue and fix. See thread of OP mentioning #18673 which mentions #17983 which is exactly the fix you provided, and is already included in 0.55.0.

[zen0wu]

That's not the same patch. That one is on line 71, which fixes for devices, mine is on line 130, which fixes simulator.

[wouterds]

@shivawu: I rest my case. 😅

[zen0wu]

I know, it's super confusing, for a minute I bought what you said, lol 😂

[grabbou]

The regression has been introduced in this commit: https://github.com/facebook/react-native/commit/2ad34075f1d048bebb08ef30799ac0d081073150. I am going to fix it by adding args.port (which as you can see from the diff has been removed by a mistake).

[grabbou]

You can find a fix here: https://github.com/facebook/react-native/commit/589eae1432cc4bbc16221f841e27b038099fd128

[grabbou]

@shivawu The releases are cut very carefully, but there's just too many pieces to test at one time. That's why having people to use release candidates would prevent such obvious errors from leaking into production.

Recent issues have to do with runIOS which is not part of our manual and automated testing.

[grabbou]

Yeah, I fixed both in 0.55. https://github.com/react-native-community/react-native-releases/issues/11#issuecomment-378889572

On Thu, 5 Apr 2018 at 23:50 Mateo Guzmán notifications@github.com wrote:

With this solution #18681 (comment) https://github.com/facebook/react-native/issues/18681#issuecomment-378441952 the metro bundler works. But, still appearing this error.

[image: image] https://user-images.githubusercontent.com/20783123/38393680-3285f4ee-38f1-11e8-9fee-4fcd385e2ca2.png

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/facebook/react-native/issues/18681#issuecomment-379087451, or mute the thread https://github.com/notifications/unsubscribe-auth/ACWcxvQXBEOP_1y35EfG4NMBnz4uyFXrks5tlpHBgaJpZM4TF1kc .

[wellyshen]

@grabbou I upgraded to 0.55 and run react-native run-ios it build success but the simulator won't be launched. so wired...

[grabbou]

Interesting. I had it already launched (you can turn it on by pressing CMD Space and typing simulator).

I'll take a closer look at the full run ios diff, that's alarming if this feature doesn't work either.

On Fri, Apr 6, 2018, 6:26 AM Welly notifications@github.com wrote:

@grabbou https://github.com/grabbou I upgraded to 0.55 and run react-native run-ios it build success but the simulator won't be triggered. so wired...

— You are receiving this because you were mentioned.

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[wellyshen]

@grabbou Thank you for this temporary solution.

[grabbou]

Here's my proposed fix: https://github.com/facebook/react-native/commit/2ad34075f1d048bebb08ef30799ac0d081073150#r28448345 Waiting for feedback and will release a patch.

I am really sorry for all the inconvenience issues with the command line tools caused for you. For the future, we will make sure to pay even more attention to commits affecting the CLI.

On Fri, 6 Apr 2018 at 09:10 Welly notifications@github.com wrote:

@grabbou https://github.com/grabbou Thank you for this temporary solution.

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[grabbou]

Here's PR: https://github.com/facebook/react-native/pull/18721. I'll probably merge it today and once 0.55 is out, make a PR back to master to make sure it has all the fixes.

[mk0y]

This doesn't happen with React 16.3.1 and React Native 0.55.4.