Add expo-keyboard-language native module

New Expo module that exposes keyboard language detection via a node
handle. On iOS it resolves the React Native view tag to the underlying
UITextField/UITextView and returns textInputMode.primaryLanguage (BCP 47
tag). Android and web return null for now.

https://claude.ai/code/session_01AMCp4M56WtFPz1pZtwgcvx

modules/expo-keyboard-language/android/build.gradle

@@ -0,0 +1,39 @@
+apply plugin: 'com.android.library'
+
+group = 'expo.modules.keyboardlanguage'
+version = '1.0.0'
+
+def expoModulesCorePlugin = new File(project(":expo-modules-core").projectDir.absolutePath, "ExpoModulesCorePlugin.gradle")
+apply from: expoModulesCorePlugin
+applyKotlinExpoModulesCorePlugin()
+useCoreDependencies()
+useExpoPublishing()
+
+def useManagedAndroidSdkVersions = false
+if (useManagedAndroidSdkVersions) {
+  useDefaultAndroidSdkVersions()
+} else {
+  buildscript {
+    ext.safeExtGet = { prop, fallback ->
+      rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+    }
+  }
+  project.android {
+    compileSdkVersion safeExtGet("compileSdkVersion", 34)
+    defaultConfig {
+      minSdkVersion safeExtGet("minSdkVersion", 21)
+      targetSdkVersion safeExtGet("targetSdkVersion", 34)
+    }
+  }
+}
+
+android {
+  namespace "expo.modules.keyboardlanguage"
+  defaultConfig {
+    versionCode 1
+    versionName "1.0.0"
+  }
+  lintOptions {
+    abortOnError false
+  }
+}

modules/expo-keyboard-language/android/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest/>

modules/expo-keyboard-language/android/src/main/java/expo/modules/keyboardlanguage/ExpoKeyboardLanguageModule.kt

@@ -0,0 +1,15 @@
+package expo.modules.keyboardlanguage
+
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+
+class ExpoKeyboardLanguageModule : Module() {
+  override fun definition() =
+    ModuleDefinition {
+      Name("ExpoKeyboardLanguage")
+
+      Function("getKeyboardLanguage") { _: Int ->
+        return@Function null as String?
+      }
+    }
+}

modules/expo-keyboard-language/expo-module.config.json

@@ -0,0 +1,9 @@
+{
+  "platforms": ["ios", "android"],
+  "ios": {
+    "modules": ["ExpoKeyboardLanguageModule"]
+  },
+  "android": {
+    "modules": ["expo.modules.keyboardlanguage.ExpoKeyboardLanguageModule"]
+  }
+}

modules/expo-keyboard-language/index.ts

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+export {getKeyboardLanguage} from './src/ExpoKeyboardLanguage'

modules/expo-keyboard-language/ios/ExpoKeyboardLanguage.podspec

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+Pod::Spec.new do |s|
+  s.name           = 'ExpoKeyboardLanguage'
+  s.version        = '1.0.0'
+  s.summary        = 'Get keyboard language for a text input'
+  s.description    = 'Get the keyboard language (textInputMode) for a specific text input by node handle'
+  s.author         = 'bluesky-social'
+  s.homepage       = 'https://github.com/bluesky-social/social-app'
+  s.platforms      = { :ios => '13.4', :tvos => '13.4' }
+  s.source         = { git: '' }
+  s.static_framework = true
+
+  s.dependency 'ExpoModulesCore'
+
+  s.pod_target_xcconfig = {
+    'DEFINES_MODULE' => 'YES',
+    'SWIFT_COMPILATION_MODE' => 'wholemodule'
+  }
+
+  s.source_files = "**/*.{h,m,mm,swift,hpp,cpp}"
+end

modules/expo-keyboard-language/ios/ExpoKeyboardLanguageModule.swift

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+import ExpoModulesCore
+
+public class ExpoKeyboardLanguageModule: Module {
+  public func definition() -> ModuleDefinition {
+    Name("ExpoKeyboardLanguage")
+
+    Function("getKeyboardLanguage") { (nodeHandle: Int) -> String? in
+      guard let view = self.appContext?.findView(withTag: nodeHandle, ofType: UIView.self) else {
+        return nil
+      }
+
+      if let textInput = self.findTextInput(in: view) {
+        return textInput.textInputMode?.primaryLanguage
+      }
+
+      return view.textInputMode?.primaryLanguage
+    }
+  }
+
+  private func findTextInput(in view: UIView) -> UIView? {
+    if view is UITextField || view is UITextView {
+      return view
+    }
+
+    for subview in view.subviews {
+      if let found = findTextInput(in: subview) {
+        return found
+      }
+    }
+
+    return nil
+  }
+}

modules/expo-keyboard-language/src/ExpoKeyboardLanguage.ts

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+import {requireNativeModule} from 'expo-modules-core'
+
+const NativeModule = requireNativeModule('ExpoKeyboardLanguage')
+
+/**
+ * Gets the keyboard language (BCP 47 tag) for the text input identified
+ * by the given node handle. Returns `null` when unavailable.
+ */
+export function getKeyboardLanguage(nodeHandle: number): string | null {
+  return NativeModule.getKeyboardLanguage(nodeHandle)
+}

modules/expo-keyboard-language/src/ExpoKeyboardLanguage.web.ts

@@ -0,0 +1,3 @@
+export function getKeyboardLanguage(_nodeHandle: number): string | null {
+  return null
+}