> For the complete documentation index, see [llms.txt](https://the-sheet.gitbook.io/the-sheet-v2/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://the-sheet.gitbook.io/the-sheet-v2/docs/resources/react-native-module-codegen.md).

# React Native Module Codegen

A brief overview of how React Native codegen handles stuff

* I asked AI for this, so it's worth looking into the official docs of codegen

## 1. The JavaScript Layer (getEnforcing)

This is the "Request."

* Where: Your TypeScript Spec file.
* The Code: TurboModuleRegistry.getEnforcing('GalaxyGate')
* Fragility: If this string doesn't match the name registered in the Native layer, JS will look for a key that doesn't exist.

## 2. The Native Layer (Registration)

This is the "Provider."

* iOS: Inside your .mm (Objective-C++) file, you have a macro: return "GalaxyGate"; (or RCT\_EXPORT\_MODULE(GalaxyGate)).
* Android: Inside your GalaxyGateModule.java, you return the name: public String getName() { return "GalaxyGate"; }
* Fragility: This is what "announces" the module to the app on boot-up. If this is UniversePortal but JS asks for GalaxyGate, the app will find nothing.

## 3. The Discovery Layer (Autolinking)

This is the "Bridge Builder" we discussed.

* The File: GalaxyGate.podspec
* The package.json: "name": "galaxy-gate"
* The codegenConfig: "name": "GalaxyGateSpec"
* Fragility: If you rename the .podspec file but don't update the s.name inside the file, CocoaPods will get confused and might not link the source files correctly.

## Naming

* Two specific names:
  * GalaxyGateSpec (The "Blueprint"): Name for generated C++ and Java code
  * GalaxyGate (The "ID"): Runtime string for handshakes between JS and Native

| Layer                    | Name Pattern            | Example File/String         |
| ------------------------ | ----------------------- | --------------------------- |
| **Your Source File**     | `Native<Name>.ts`       | `NativeGalaxyGate.ts`       |
| **Codegen Output (C++)** | `Native<Name>Spec.h`    | `NativeGalaxyGateSpec.h`    |
| **Java Interface**       | `Native<Name>Spec.java` | `NativeGalaxyGateSpec.java` |
| **The Handshake ID**     | `<Name>`                | `GalaxyGate`                |


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