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Dawid Małecki 3e14d1638c Add babel plugin to @react-native/babel-preset for console.warn injection under deep react native imports (#50802 )

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/50802

The plugin analyses the source of all `import`, `require`, and `export` statements and injects the `console.warn` statement for each path targeting deep react-native source code. It runs only on a dev mode so there is no need to keep that in the `if (__DEV__) ` block. It is possible to disable this plugin by setting `disableDeepImportWarnings: true` and **resetting** the Metro cache:

```js
module.exports = {
  presets: [['module:react-native/babel-preset', {
    "disableDeepImportWarnings": true
  }]],
};
```

Changelog:
[General][Internal] - Added plugin to react-native/babel-preset injecting `console.warn` for each react native deep import in dev mode.

For a given code:
```js
import { Image } from 'react-native';
import View from 'react-native/Libraries/Components/View/View';
const Text = require('react-native/Libraries/Text/Text');
export { PressabilityDebugView } from 'react-native/Libraries/Pressability/PressabilityDebug';
```

The transformed output should look like:

```js
import { Image } from 'react-native';
import View from 'react-native/Libraries/Components/View/View';
const Text = require('react-native/Libraries/Text/Text');
export { PressabilityDebugView } from 'react-native/Libraries/Pressability/PressabilityDebug';
console.warn("Deep imports from the 'react-native' package are deprecated ('react-native/Libraries/Components/View/View').");
console.warn("Deep imports from the 'react-native' package are deprecated ('react-native/Libraries/Text/Text').");
console.warn("Deep imports from the 'react-native' package are deprecated ('react-native/Libraries/Pressability/PressabilityDebug').");
```

For more information about why this plugin was needed, please check [RFC](https://github.com/react-native-community/discussions-and-proposals/pull/894).

Reviewed By: huntie

Differential Revision: D70783145

fbshipit-source-id: ae145db6471d861099566a8faf2fbd93bd136450

2025-04-24 08:04:21 -07:00

src

Add babel plugin to @react-native/babel-preset for console.warn injection under deep react native imports (#50802 )

2025-04-24 08:04:21 -07:00

package.json

Update hermes-parser and related packages in xplat to 0.28.1 (#50803 )

2025-04-21 07:50:22 -07:00

README.md

…

README.md

@react-native/babel-preset

Babel presets for React Native applications. React Native itself uses this Babel preset by default when transforming your app's source code.

If you wish to use a custom Babel configuration by writing a babel.config.js file in your project's root directory, you must specify all the plugins necessary to transform your code. React Native does not apply its default Babel configuration in this case. So, to make your life easier, you can use this preset to get the default configuration and then specify more plugins that run before it.

Usage

As mentioned above, you only need to use this preset if you are writing a custom babel.config.js file.

Installation

Install @react-native/babel-preset in your app:

with npm:

npm i @react-native/babel-preset --save-dev

or with yarn:

yarn add -D @react-native/babel-preset

Configuring Babel

Then, create a file called babel.config.js in your project's root directory. The existence of this babel.config.js file will tell React Native to use your custom Babel configuration instead of its own. Then load this preset:

{
  "presets": ["module:@react-native/babel-preset"]
}

You can further customize your Babel configuration by specifying plugins and other options. See Babel's babel.config.js documentation to learn more.

Help and Support

If you get stuck configuring Babel, please ask a question on Stack Overflow or find a consultant for help. If you discover a bug, please open up an issue.