React Native 0.43 completely broken

[Swizec]

Description

I ran react-native init MyAwesomeApp. It finishes with npm warnings about peer dependencies and the default app doesn't even run.

Reproduction Steps and Sample Code

react-native init MyAwesomeApp
cd MyAwesomeApp
react-native run-ios

Observe that it doesn't work.

Solution

I assume the issue stems from this:

And potentially other things related to that. I don't understand enough about how react-native works to know what's wrong.

Additional Information

• React Native version: 0.43.0
• Platform: iOS
• Development Operating System: MacOS Sierra
• Dev tools: CLI

[janicduplessis]

Thanks for reporting this, the peer dep isn't actually the issue. Might be related to some yoga commits that were cherry picked recently. cc @grabbou

[grabbou]

Have you tried restarting packager after upgrading React Native? Before pushing, I've checked run-ios on UIExplorer (bundled example of React Native) and everything worked.

@janicduplessis I was planning to cherry-pick Yoga commit but eventually didn't, as the commit was to Yoga separate repo.

[Swizec]

I wasn't updating React Native, I was starting a new project.

But it does look like I had a packager from a different project running in a hidden terminal window. After killing that and restarting, everything seems to work.

Thanks for the help ... but why can different projects impact each other like this?

[grabbou]

@Swizec packager was serving you a bundle for a different React Native version which resulted in a mismatch when JS -> Native calls happen (as per error message).

[janicduplessis]

Yea every RN packager always runs on the same port so it didn't start a new packager for your new project and just used the one that was running already.