Decorators don't work in release builds using SDK 31

Expo SDK
1

We are using decorators and they have stopped working in SDK 31. This seems to be a RN bug https://github.com/facebook/react-native/issues/20150#issue-340235017

What is the best way to work around this in expo?

2

We use decorators extensively and this config has worked out for us so far in 31:

package.json devDependencies:

"@babel/plugin-proposal-decorators": "^7.1.0",
    "babel-preset-expo": "^5.0.0",
...

babel.config.js:

module.exports = function(api) {
  api.cache(true);
  return {
    presets: ['babel-preset-expo'],
    plugins: [['@babel/plugin-proposal-decorators', { legacy: true }]],
  };
};

With these or any babel config changes, thing seem to work best if you stop Expo and restart it with the -c flag to clear the JS cache.

3

Have you deployed your app ? It works fine for us in development but not for release builds

4

Yeah, it’s worked for on release builds. When we first upgraded to 31, with our babel config mostly intact from 30, we did see similar behavior- worked in dev, not in release.

5

Thanks, I’ll give it a try

6

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