Merge branch 'master' of https://github.com/wix/react-native-navigation…

… into feature/rnnav-crash-fixes * 'master' of https://github.com/wix/react-native-navigation: (627 commits) Fix title component not being replaced via mergeOptions (wix#6066) Remove Shared Element Screen from Options screen (wix#6065) Configure scrollEdgeAppearance with opaque background (wix#6038) Update package.json version to 6.3.1 [ci skip] Always resolve dismissAllModals promise (wix#6054) Custom component reference id OptionsTopBarButton typing (wix#6053) Some work on animation config in the playground app Update changelog Update package.json version to 6.3.0 [ci skip] Resolve options from bottomTabs direct child in mergeChildOptions (wix#6050) Fix build warnings on iOS (wix#6047) Reject pop command when viewController not found in the hierarchy (wix#6048) Merge options with correct child (wix#6041) Removes unable to find UIManager module warning (wix#6043) Fix overlays touch interception on new iPads (wix#6042) Update Stack Overflow tag in readme Update changelog Added two icons to playground app Added Toast component to playground Update slow animations in playground ... # Conflicts: # CHANGELOG.md # babel.config.js # docs/docs/Installing.md # docs/docs/events.md # docs/docs/showcases.md # docs/docs/styling.md # docs/docs/topBar-buttons.md # lib/android/app/build.gradle # lib/android/app/src/main/java/com/reactnativenavigation/NavigationActivity.java # lib/android/app/src/main/java/com/reactnativenavigation/parse/LayoutFactory.java # lib/android/app/src/main/java/com/reactnativenavigation/parse/TitleOptions.java # lib/android/app/src/main/java/com/reactnativenavigation/presentation/BottomTabPresenter.java # lib/android/app/src/main/java/com/reactnativenavigation/presentation/BottomTabsPresenter.java # lib/android/app/src/main/java/com/reactnativenavigation/presentation/ComponentPresenter.java # lib/android/app/src/main/java/com/reactnativenavigation/presentation/Presenter.java # lib/android/app/src/main/java/com/reactnativenavigation/presentation/SideMenuPresenter.java # lib/android/app/src/main/java/com/reactnativenavigation/presentation/StackPresenter.java # lib/android/app/src/main/java/com/reactnativenavigation/react/NavigationModule.java # lib/android/app/src/main/java/com/reactnativenavigation/react/ReactView.java # lib/android/app/src/main/java/com/reactnativenavigation/utils/CollectionUtils.java # lib/android/app/src/main/java/com/reactnativenavigation/utils/Functions.java # lib/android/app/src/main/java/com/reactnativenavigation/utils/ImageLoader.java # lib/android/app/src/main/java/com/reactnativenavigation/utils/NoOpPromise.java # lib/android/app/src/main/java/com/reactnativenavigation/utils/ObjectUtils.java # lib/android/app/src/main/java/com/reactnativenavigation/utils/ViewUtils.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/ComponentViewController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/IdStack.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/ParentController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/TitleBarButtonController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/TitleBarReactViewController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/ViewController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/bottomtabs/BottomTabsController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/button/IconResolver.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/navigator/Navigator.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/navigator/RootPresenter.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/sidemenu/SideMenuController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/stack/StackController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/stack/StackControllerBuilder.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/topbar/TopBarBackgroundViewController.java # lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/topbar/TopBarController.java # lib/android/app/src/main/java/com/reactnativenavigation/views/BottomTabs.java # lib/android/app/src/main/java/com/reactnativenavigation/views/Component.java # lib/android/app/src/main/java/com/reactnativenavigation/views/Fab.java # lib/android/app/src/main/java/com/reactnativenavigation/views/StackLayout.java # lib/android/app/src/main/java/com/reactnativenavigation/views/topbar/TopBar.java # lib/android/app/src/reactNative57_5/java/com/reactnativenavigation/react/NavigationReactNativeHost.java # lib/android/app/src/reactNative57_5/java/com/reactnativenavigation/react/SyncUiImplementation.java # lib/android/app/src/test/java/com/reactnativenavigation/TestUtils.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ComponentViewControllerTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/OptionsApplyingTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/StackPresenterTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/TopBarControllerTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/bottomtabs/BottomTabsControllerTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/navigator/NavigatorTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/navigator/RootPresenterTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/sidemenu/SideMenuControllerTest.java # lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/stack/StackControllerTest.java # lib/android/app/src/test/java/com/reactnativenavigation/views/TopBarTest.java # lib/ios/RNNBridgeManager.m # lib/ios/RNNBridgeModule.m # lib/ios/RNNCommandsHandler.h # lib/ios/RNNCommandsHandler.m # lib/ios/RNNControllerFactory.m # lib/ios/RNNLeafProtocol.h # lib/ios/RNNNavigationButtons.m # lib/ios/RNNNavigationController.m # lib/ios/RNNNavigationControllerPresenter.m # lib/ios/RNNNavigationStackManager.m # lib/ios/RNNRootViewController.m # lib/ios/RNNScreenTransition.h # lib/ios/RNNScreenTransition.m # lib/ios/RNNSideMenuChildVC.m # lib/ios/RNNSideMenuController.m # lib/ios/RNNTabBarController.m # lib/ios/RNNTabBarPresenter.m # lib/ios/RNNTransitionsOptions.h # lib/ios/RNNUIBarButtonItem.h # lib/ios/RNNUIBarButtonItem.m # lib/ios/RNNViewControllerPresenter.m # lib/ios/ReactNativeNavigation.xcodeproj/project.pbxproj # lib/ios/ReactNativeNavigationTests/RNNCommandsHandlerTest.m # lib/ios/ReactNativeNavigationTests/RNNSideMenuPresenterTest.m # lib/ios/ReactNativeNavigationTests/RNNTabBarPresenterTest.m # lib/ios/UINavigationController+RNNCommands.h # lib/ios/UIViewController+RNNOptions.h # lib/ios/UIViewController+RNNOptions.m # lib/src/Navigation.ts # lib/src/adapters/Constants.ts # lib/src/adapters/NativeEventsReceiver.ts # lib/src/adapters/TouchablePreview.tsx # lib/src/adapters/UniqueIdProvider.ts # lib/src/commands/Commands.test.ts # lib/src/commands/Commands.ts # lib/src/commands/LayoutTreeCrawler.test.ts # lib/src/commands/LayoutTreeCrawler.ts # lib/src/commands/LayoutTreeParser.test.ts # lib/src/commands/LayoutTreeParser.ts # lib/src/commands/OptionsProcessor.test.ts # lib/src/commands/OptionsProcessor.ts # lib/src/components/ComponentRegistry.test.tsx # lib/src/components/ComponentWrapper.test.tsx # lib/src/components/ComponentWrapper.tsx # lib/src/components/Store.test.ts # lib/src/components/Store.ts # lib/src/events/ComponentEventsObserver.test.tsx # lib/src/events/ComponentEventsObserver.ts # lib/src/events/EventsRegistry.ts # lib/src/interfaces/Layout.ts # lib/src/interfaces/Options.ts # metro.config.js # package.json # playground/android/app/build.gradle # playground/android/app/src/main/AndroidManifest.xml # playground/android/build.gradle # playground/android/gradle.properties # playground/android/gradle/wrapper/gradle-wrapper.properties # playground/ios/NavigationTests/RNNNavigationStackManagerTest.m # playground/ios/playground.xcodeproj/project.pbxproj # playground/src/app.js # playground/src/context/index.js # playground/src/screens/BackHandlerModalScreen.js # playground/src/screens/BackHandlerScreen.js # playground/src/screens/ComplexLayout.js # playground/src/screens/ContextScreen.js # playground/src/screens/CustomDialog.js # playground/src/screens/CustomTransitionDestination.js # playground/src/screens/CustomTransitionOrigin.js # playground/src/screens/ModalScreen.js # playground/src/screens/OptionsScreen.js # playground/src/screens/PushedScreen.js # playground/src/screens/SearchScreen.js # playground/src/screens/SideMenuScreen.js # playground/src/screens/TextScreen.js # playground/src/screens/WelcomeScreen.js # playground/src/screens/complexlayouts/CustomDialogWithScroll.js # playground/src/screens/index.js # playground/src/testIDs.js # scripts/release.js # scripts/test-unit.js
anushnair · Mar 23, 2020 · aeec746 · aeec746
2 parents 73b93f5 + b0e8a82
commit aeec746
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diff --git a/.github/ISSUE_TEMPLATE b/.github/ISSUE_TEMPLATE
@@ -4,6 +4,10 @@
 
 ### Steps to Reproduce / Code Snippets / Screenshots
 
+<!-- Note: When embeding code, please format it and use syntax highlighting to improve readability -->
+<!-- ```js                                                         -->
+<!-- [ THIS CODE BLOCK WILL USE JAVASCRIPT SYNTAX HIGHLIGHTING ]   -->
+<!-- ```                                                           -->
 [FILL THIS OUT]
 
 ---

diff --git a/.github/stale.yml b/.github/stale.yml
@@ -27,7 +27,7 @@ markComment: >
   This issue has been automatically marked as stale because it has not had
   recent activity. It will be closed if no further activity occurs. 
   
-  If you believe the issue is still relevant, please test on the latest Detox and report back.
+  If you believe the issue is still relevant, please test on the latest version and report back.
   Thank you for your contributions.
 # Comment to post when removing the stale label.
 # unmarkComment: >
@@ -51,4 +51,4 @@ pulls:
     for your contributions.
 # issues:
 #   exemptLabels:
-#     - confirmed
+#     - confirmed
diff --git a/.gitignore b/.gitignore
@@ -1,5 +1,6 @@
 .vscode/
 package-lock.json
+.history/
 
 ############
 # Node

diff --git a/CHANGELOG.md b/CHANGELOG.md
diff --git a/README.md b/README.md
@@ -3,7 +3,7 @@
 [![npm (tag)](https://img.shields.io/npm/v/react-native-navigation/snapshot.svg)](https://github.com/wix/react-native-navigation/tree/master)
 [![Build Status](https://img.shields.io/jenkins/s/http/jenkins-oss.wixpress.com:8080/job/multi-react-native-navigation-master.svg)](https://jenkins-oss.wixpress.com/job/multi-react-native-navigation-master/)
 [![Join us on Discord](https://img.shields.io/badge/discord-react--native--navigation-738bd7.svg?style=flat)](https://discord.gg/DhkZjq2)
-[![StackExchange](https://img.shields.io/stackexchange/stackoverflow/t/react-native-navigation.svg)](https://stackoverflow.com/questions/tagged/react-native-navigation)
+[![StackExchange](https://img.shields.io/stackexchange/stackoverflow/t/react-native-navigation.svg)](https://stackoverflow.com/questions/tagged/wix-react-native-navigation)
 
 <h1 align="center">
   <img src=".logo.png"/><br>
@@ -14,6 +14,7 @@ React Native Navigation provides 100% native platform navigation on both iOS and
 
 # Quick Links
 - [Documentation](https://wix.github.io/react-native-navigation/)
+- [Changelog](https://github.com/wix/react-native-navigation/blob/master/CHANGELOG.md)
 - [Stack Overflow](http://stackoverflow.com/questions/tagged/react-native-navigation)
 - [Chat with us](https://discord.gg/DhkZjq2)
 - [Contributing](/docs/docs/WorkingLocally.md)

diff --git a/ReactNativeNavigation.podspec b/ReactNativeNavigation.podspec
@@ -19,5 +19,7 @@ Pod::Spec.new do |s|
   s.exclude_files  = "lib/ios/ReactNativeNavigationTests/**/*.*", "lib/ios/OCMock/**/*.*"
 
   s.dependency 'React'
+  s.dependency 'React-RCTImage'
+  s.dependency 'React-RCTText'
   s.frameworks = 'UIKit'
 end
diff --git a/autolink/postlink.sh b/autolink/postlink.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -e
+
+echo "RNN postlink !!!!!!!!!!!!!!!!!"
diff --git a/autolink/postlink/activityLinker.js b/autolink/postlink/activityLinker.js
@@ -0,0 +1,50 @@
+// @ts-check
+var path = require('./path');
+var fs = require("fs");
+var { warnn, logn, infon, debugn } = require("./log");
+
+class ActivityLinker {
+  constructor() {
+    this.activityPath = path.mainActivityJava;
+  }
+
+  link() {
+    logn("Linking MainActivity...");
+    if (this.activityPath) {
+      var activityContent = fs.readFileSync(this.activityPath, "utf8");
+      activityContent = this._extendNavigationActivity(activityContent);
+      activityContent = this._removeGetMainComponentName(activityContent);
+      fs.writeFileSync(this.activityPath, activityContent);
+      infon("MainActivity linked successfully!\n");
+    } else {
+      warnn("   MainActivity not found!");
+    }
+  }
+
+  _removeGetMainComponentName(contents) {
+    var match = /\/\*\*\s*\n([^\*]|(\*(?!\/)))*\*\/\s*@Override\s*protected\s*String\s*getMainComponentName\s*\(\)\s*{\s*return.+\s*\}/.exec(contents);
+    if (match) {
+      debugn("   Removing getMainComponentName function");
+      return contents.replace(/\/\*\*\s*\n([^\*]|(\*(?!\/)))*\*\/\s*@Override\s*protected\s*String\s*getMainComponentName\s*\(\)\s*{\s*return.+\s*\}/, "");
+    }
+    return contents;
+  }
+
+  _extendNavigationActivity(activityContent) {
+    if (this._doesActivityExtendReactActivity(activityContent)) {
+      debugn("   Extending NavigationActivity")
+      return activityContent
+        .replace(/extends\s+ReactActivity\s*/, "extends NavigationActivity ")
+        .replace("import com.facebook.react.ReactActivity;", "import com.reactnativenavigation.NavigationActivity;")
+    } else {
+      warnn("   MainActivity already extends NavigationActivity")
+    }
+    return activityContent;
+  }
+
+  _doesActivityExtendReactActivity(activityContent) {
+    return /public\s+class\s+MainActivity\s+extends\s+ReactActivity\s*/.test(activityContent);
+  }
+}
+
+module.exports = ActivityLinker;
diff --git a/autolink/postlink/appDelegateLinker.js b/autolink/postlink/appDelegateLinker.js
@@ -0,0 +1,78 @@
+// @ts-check
+var path = require('./path');
+var fs = require("fs");
+var {warnn, logn, infon, debugn} = require("./log");
+
+class ApplicationLinker {
+  constructor() {
+    this.appDelegatePath = path.appDelegate;
+  }
+
+  link() {
+    if (this.appDelegatePath) {
+      logn("Linking AppDelegate...");
+      var appDelegateContents = fs.readFileSync(this.appDelegatePath, "utf8");
+      if (this._doesBootstrapNavigation(appDelegateContents)) {
+        infon("AppDelegate already linked\n");
+        return;
+      }
+      appDelegateContents = this._removeUnneededImports(appDelegateContents);
+      appDelegateContents = this._importNavigation(appDelegateContents);
+      appDelegateContents = this._bootstrapNavigation(appDelegateContents);
+      appDelegateContents = this._removeApplicationLaunchContent(appDelegateContents);
+      fs.writeFileSync(this.appDelegatePath, appDelegateContents);
+      infon("AppDelegate linked successfully!\n");
+    }
+  }
+
+  _doesBootstrapNavigation(applicationContent) {
+    return /ReactNativeNavigation\s+bootstrap/.test(applicationContent);
+  }
+
+  _removeUnneededImports(applicationContent) {
+    const unneededImports = [/\#import\s+\<React\/RCTBridge.h>\s/, /#import\s+\<React\/RCTRootView.h>\s/];
+    debugn("   Removing Unneeded imports");
+    unneededImports.forEach(unneededImport => {
+      if (unneededImport.test(applicationContent)) {
+        applicationContent = applicationContent.replace(unneededImport, "");
+      }
+    });
+
+    return applicationContent;
+  }
+
+  _importNavigation(applicationContent) {
+    if (!this._doesImportNavigation(applicationContent)) {
+      debugn("   ");
+      return applicationContent
+        .replace(/#import\s+"AppDelegate.h"/, "#import \"AppDelegate.h\"\n#import <ReactNativeNavigation/ReactNativeNavigation.h>")
+    }
+    warnn("   AppDelegate already imports Navigation");
+    return applicationContent;
+  }
+
+  _removeApplicationLaunchContent(applicationContent) {
+    const toRemove = [/RCTRootView\s+\*rootView((.|\r|\s)*?)];\s+/, /rootView.backgroundColor((.|\r)*)];\s+/,
+      /self.window((.|\r)*)];\s+/, /UIViewController\s\*rootViewController((.|\r)*)];\s+/, /rootViewController\.view\s+=\s+rootView;\s+/,
+      /self.window.rootViewController\s+=\s+rootViewController;\s+/, /\[self.window\s+makeKeyAndVisible];\s+/
+    ]
+
+    toRemove.forEach(element => {
+      if (element.test(applicationContent)) {
+        applicationContent = applicationContent.replace(element, "");
+      }
+    });
+
+    return applicationContent;
+  }
+
+  _bootstrapNavigation(applicationContent) {
+    return applicationContent.replace(/RCTBridge.*];/, "[ReactNativeNavigation bootstrapWithDelegate:self launchOptions:launchOptions];");
+  }
+
+  _doesImportNavigation(applicationContent) {
+    return /#import\s+\<ReactNativeNavigation\/ReactNativeNavigation.h>/.test(applicationContent);
+  }
+}
+
+module.exports = ApplicationLinker;
diff --git a/autolink/postlink/applicationLinker.js b/autolink/postlink/applicationLinker.js
@@ -0,0 +1,68 @@
+// @ts-check
+var path = require('./path');
+var fs = require("fs");
+var { warnn, logn, infon, debugn } = require("./log");
+
+class ApplicationLinker {
+  constructor() {
+    this.applicationPath = path.mainApplicationJava;
+  }
+
+  link() {
+    if (this.applicationPath) {
+      logn("Linking MainApplication...");
+      var applicationContents = fs.readFileSync(this.applicationPath, "utf8");
+      var linkers = [this._extendNavigationApplication, this._extendNavigationHost, this._removeSOLoaderInit];
+      applicationContents = this._extendNavigationApplication(applicationContents);
+      applicationContents = this._extendNavigationHost(applicationContents);
+      applicationContents = this._removeSOLoaderInit(applicationContents);
+      fs.writeFileSync(this.applicationPath, applicationContents);
+      infon("MainApplication linked successfully!\n");
+    }
+  }
+
+  _extendNavigationApplication(applicationContent) {
+    if (this._doesExtendApplication(applicationContent)) {
+      debugn("   Extending NavigationApplication");
+      return applicationContent
+        .replace(/extends\s+Application\s+implements\s+ReactApplication/gi, "extends NavigationApplication")
+        .replace("import com.facebook.react.ReactApplication;", "import com.reactnativenavigation.NavigationApplication;");
+    }
+    warnn("   MainApplication already extends NavigationApplication");
+    return applicationContent;
+  }
+
+  _doesExtendApplication(applicationContent) {
+    return /\s+MainApplication\s+extends\s+Application\s+implements\s+ReactApplication\s+/.test(applicationContent);
+  }
+
+  _extendNavigationHost(applicationContent) {
+    if (this._doesExtendReactNativeHost(applicationContent)) {
+      debugn("   Changing host implementation to NavigationReactNativeHost");
+      return applicationContent
+        .replace("new ReactNativeHost(this)", "new NavigationReactNativeHost(this)")
+        .replace("import com.facebook.react.ReactNativeHost;", "import com.facebook.react.ReactNativeHost;\nimport com.reactnativenavigation.react.NavigationReactNativeHost;")
+    }
+    warnn("   NavigationReactNativeHost is already used");
+    return applicationContent;
+  }
+
+  _removeSOLoaderInit(applicationContent) {
+    if (this._isSOLoaderInitCalled(applicationContent)) {
+      debugn("   Removing call to SOLoader.init()");
+      return applicationContent.replace(/SoLoader.init\(\s*this\s*,\s*[/* native exopackage */]*\s*false\s*\);/, "")
+    }
+    warnn("   SOLoader.init() is not called");
+    return applicationContent;
+  }
+
+  _isSOLoaderInitCalled(applicationContent) {
+    return /SoLoader.init\(this,\s*[/* native exopackage */]*\s*false\);/.test(applicationContent);
+  }
+
+  _doesExtendReactNativeHost(applicationContent) {
+    return /\s*new ReactNativeHost\(this\)\s*/.test(applicationContent);
+  }
+}
+
+module.exports = ApplicationLinker;
diff --git a/autolink/postlink/gradleLinker.js b/autolink/postlink/gradleLinker.js
@@ -0,0 +1,128 @@
+// @ts-check
+var path = require('./path');
+var fs = require('fs');
+var { warnn, errorn, logn, infon, debugn } = require('./log');
+var { insertString } = require('./stringUtils');
+var DEFAULT_KOTLIN_VERSION = '1.3.61';
+// This should be the minSdkVersion required for RNN.
+var DEFAULT_MIN_SDK_VERSION = 19
+
+class GradleLinker {
+  constructor() {
+    this.gradlePath = path.rootGradle;
+  }
+
+  link() {
+    logn('Linking root build.gradle...');
+    if (this.gradlePath) {
+      var contents = fs.readFileSync(this.gradlePath, 'utf8');
+      contents = this._setKotlinVersion(contents);
+      contents = this._setKotlinPluginDependency(contents);
+      contents = this._setMinSdkVersion(contents);
+      fs.writeFileSync(this.gradlePath, contents);
+      infon('Root build.gradle linked successfully!\n');
+    } else {
+      warnn('   Root build.gradle not found!');
+    }
+  }
+
+  _setKotlinPluginDependency(contents) {
+    if (this._isKotlinPluginDeclared(contents)) {
+      warnn('   Kotlin plugin already declared')
+      return contents;
+    }
+    var match = /classpath\s*\(*["']com\.android\.tools\.build:gradle:/.exec(contents);
+    if (match) {
+      debugn("   Adding Kotlin plugin");
+      return insertString(contents, match.index, `classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${DEFAULT_KOTLIN_VERSION}"\n        `);
+    } else {
+      errorn("   Could not add kotlin plugin dependency")
+    }
+    return contents;
+  }
+
+  _setKotlinVersion(contents) {
+    if (this._isKotlinVersionSpecified(contents)) {
+      warnn("   Kotlin version already specified");
+    } else {
+      var kotlinVersion = this._getKotlinVersion(contents);
+      if (this._hasExtensionVariablesBlock(contents)) {
+        debugn("   Adding RNNKotlinVersion to extension block");
+        return contents.replace(/ext\s*{/, `ext {\n        RNNKotlinVersion = ${kotlinVersion}`);
+      } else {
+        debugn("   Adding RNNKotlinVersion extension variable");
+        return contents.replace(/buildscript\s*{/, `buildscript {\n    ext.RNNKotlinVersion = ${kotlinVersion}`);
+      }
+    }
+    return contents;
+  }
+
+  /**
+   * Check the current minSdkVersion specified and if it's lower than
+   * the required version, set it to the required version otherwise leave as it is.
+   */
+  _setMinSdkVersion(contents) {
+    var minSdkVersion = this._getMinSdkVersion(contents)
+    // If user entered minSdkVersion is lower than the default, set it to default.
+    if (minSdkVersion < DEFAULT_MIN_SDK_VERSION) {
+      debugn(`   Updating minSdkVersion to ${DEFAULT_MIN_SDK_VERSION}`)
+      return contents.replace(/minSdkVersion\s{0,}=\s{0,}\d*/, `minSdkVersion = ${DEFAULT_MIN_SDK_VERSION}`)
+    } 
+
+    debugn(`   Already specified minSdkVersion ${minSdkVersion}`)
+    return contents.replace(/minSdkVersion\s{0,}=\s{0,}\d*/, `minSdkVersion = ${minSdkVersion}`)
+  }
+
+  /**
+   * @param { string } contents
+   */
+  _getKotlinVersion(contents) {
+    var hardCodedVersion = contents.match(/(?<=kotlin-gradle-plugin:)\$*[\d\.]{3,}/);
+    if (hardCodedVersion && hardCodedVersion.length > 0) {
+      return `"${hardCodedVersion[0]}"`;
+    }
+    var extensionVariableVersion = contents.match(/(?<=kotlin-gradle-plugin:)\$*[a-zA-Z\d\.]*/);
+    if (extensionVariableVersion && extensionVariableVersion.length > 0) {
+      return extensionVariableVersion[0].replace("$", "");
+    }
+    return `"${DEFAULT_KOTLIN_VERSION}"`;
+  }
+
+  /**
+   * Get the minSdkVersion value.
+   * @param { string } contents
+   */
+  _getMinSdkVersion(contents) {
+    var minSdkVersion = contents.match(/minSdkVersion\s{0,}=\s{0,}(\d*)/)
+
+    if (minSdkVersion && minSdkVersion[1]) {
+      // It'd be something like 16 for a fresh React Native project.
+      return +minSdkVersion[1] 
+    }
+
+    return DEFAULT_MIN_SDK_VERSION
+  }
+
+  /**
+   * @param {string} contents
+   */
+  _hasExtensionVariablesBlock(contents) {
+    return /ext\s*{/.test(contents);
+  }
+
+  /**
+   * @param {string} contents
+   */
+  _isKotlinVersionSpecified(contents) {
+    return /RNNKotlinVersion/.test(contents);
+  }
+
+  /**
+   * @param {string} contents
+   */
+  _isKotlinPluginDeclared(contents) {
+    return /org.jetbrains.kotlin:kotlin-gradle-plugin:/.test(contents);
+  }
+}
+
+module.exports = GradleLinker;