https://i.sstatic.net/LYdxj.pngRecently, I upgraded my react native version to the latest one and encountered an error stating "Transformer is not a constructor". The metro-react-native-babel-preset version I am currently using is 0.64.0. Can someone please assist me in finding a solution for this issue?
Have you considered the possibility that the react-native-fs package (v2.17.0) might be causing this issue? It seems to have an internal dependency on an older version of metro and metro-config (v0.51.1), which could be why your project is not resolving to the latest version.
To verify which version is being resolved, try running npm ls metro-config and check the topmost result. If necessary, you may need to force-install both metro and metro-config using the following command:
npm i -D <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="375a5243455877071901031907">[email protected]</a> <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f09d9584829fdd939f9e969997b0c0dec6c4dec0">[email protected]</a> --force
Like @cr0ybot mentioned, I encountered an issue due to an incompatible version of metro-config.
To resolve this issue, follow these steps:
yarn list metro-config to see all packages that depend on metro-config.If
yarn listdoes not provide enough information, refer to youryarn.lockfile to determine dependencies.
In my situation, the culprit was react-native-community/cli, though it could vary for others.
I encountered a similar issue on my react-native project when I mistakenly upgraded to version 0.64.1. The problem was resolved after reverting back to the previous version (0.63.2) that I had been using.
It's possible that you encounter compatibility issues between different versions of react and metro-config.
To resolve this, check the expected version of metro-config with the command npm ls metro-config, which will display the required version.
https://i.sstatic.net/kL95y.png
You can then update to the correct version by running
npm i -D <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="59343c2d2b36192177217721">[email protected]</a> <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0c6169787e63216f63626a656b4c7422742274">[email protected]</a> --forceSolution implemented by modifying the metro.config.js file as shown below:
module.exports = {
transformer: {
getTransformOptions: async () => ({
transform: {
experimentalImportSupport: false,
inlineRequires: true,
},
}),
},
};
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