Example of Circle CI config for React Native CI (Appcenter, Kotlin, Swift, RN 0.49+, Haul packager, signing via Match, be sure that you have set env MATCH_PASSWORD, FASTLANE_PASSWORD and SLACK_URL)

android_Fastlane

fastlane_version "2.64.1"

default_platform :android

platform :android do
  lane :beta do
    gradle(task: "assembleRelease")

    appcenter_upload(
      api_token: "",
      owner_name: "",
      group: "",
      app_name: "",
      apk: lane_context[SharedValues::GRADLE_APK_OUTPUT_PATH], 
      release_notes: (is_ci ? "This release is **automatic** from *master* branch." : "This release is **manual** from *"+git_branch+"* branch. Probably don't test it.") + "\n\n" + last_git_commit[:message],
    )

    clean_build_artifacts
  end

  after_all do |lane|
    if is_ci?
      id = lane_context[SharedValues::APPCENTER_BUILD_INFORMATION]['id']
      slack(
        username: "",
        icon_url: "",
        message: "<https://install.appcenter.ms/users//apps//releases/#{id}/|Android Releases>\n🚀 Release number: #{id}",
      )
    end
  end

  error do |lane, exception|
    if is_ci?
      slack(
        username: "",
        icon_url: "",
        message: exception.message,
        success: false
      )
    end
  end
end

config.yml

version: 2

defaults: &defaults
  working_directory: ~/project
  docker:
    - image: circleci/node:latest

android_defaults: &android_defaults
  working_directory: ~/project/android
  docker:
    - image: farwayer/react-native
  environment:
    - LANG: "en_US.UTF-8"
    - _JAVA_OPTIONS: "-Xms518m -Xmx2048m"
    - GRADLE_OPTS: '-Dorg.gradle.jvmargs="-Xmx2048m -XX:+HeapDumpOnOutOfMemoryError"'
    - BUILD_THREADS: 2

ios_defaults: &ios_defaults
  working_directory: ~/project/ios
  macos:
      xcode: "9.1.0"
  environment:
    - LANG: "en_US.UTF-8"
    - MATCH_KEYCHAIN_NAME: "circle"
    - MATCH_KEYCHAIN_PASSWORD: "circle"

jobs:
  install-dependencies:
    <<: *defaults
    steps:
      - checkout
      - attach_workspace:
          at: ~/project 
      - restore_cache:
          keys:
          - v1-0-dependencies-{{ checksum "package.json" }}
          # fallback to using the latest cache if no exact match is found
          - v1-0-dependencies-
      - run:
          name: Install Dependencies
          command: yarn
      - save_cache:
          key: v1-0-dependencies-{{ checksum "package.json" }}
          paths:
            - node_modules
            - yarn.lock
      - persist_to_workspace:
          root: .
          paths: .
  flow:
    <<: *defaults
    steps:
      - attach_workspace:
          at: ~/project
      - run: yarn flow
  lint:
    <<: *defaults
    steps:
      - attach_workspace:
         at: ~/project
      - run: yarn lint
  unit-tests:
    <<: *defaults
    steps:
      - attach_workspace:
          at: ~/project
      - restore_cache:
          keys:
          - v1-0-jest-cache-{{ checksum "package.json" }}
          # fallback to using the latest cache if no exact match is found
          - v1-0-jest-cache-
      - run: yarn test:ci
      - save_cache:
          key: v1-0-jest-cache-{{ checksum "package.json" }}
          paths:
            - .jestCache
      - persist_to_workspace:
          root: .
          paths: .
  danger:
      <<: *defaults
      steps:
        - attach_workspace:
            at: ~/project
        - run: yarn danger
  ios-beta:
    <<: *ios_defaults 
    steps:
      - attach_workspace:
          at: ~/project
      - run:
          name: Install CocoaPod Spec 
          command: curl https://cocoapods-specs.circleci.com/fetch-cocoapods-repo-from-s3.sh | bash -s cf
      - run:
          name: Install Ruby and Fastlane
          command: |
           brew install ruby
           gem install fastlane
      - run:
          name: Update CocaPods dependencies
          command: pod install --verbose
          timeout: 1200
      - run:
          name: Bundle update
          command: bundle update
      - run:
          name: Fastlane
          command: bundle exec fastlane beta 
  android-beta:
    <<: *android_defaults 
    steps:
      - attach_workspace:
          at: ~/darwin
      - run: 
          name: "Optimize build.gradle for CI"
          command: sed -i 's/2g/1g/' app/build.gradle
      - run:
          name: Install Fastlane  
          command: |
            gem install fastlane -NV
      - run:
          name: Bundle update
          command: bundle update
      - run:
          name: Fastlane 
          command: bundle exec fastlane beta 
workflows:
  version: 2
  test:
    jobs:
      - install-dependencies
      - lint:
          requires:
            - install-dependencies
      - flow:
          requires:
            - install-dependencies
      - unit-tests:
          requires:
            - install-dependencies
      - danger:
          requires:
            - install-dependencies
      - ios-beta:
          requires: 
            - install-dependencies
            - unit-tests
          filters:
            branches:
              only: master
      - android-beta:
          requires: 
            - install-dependencies
            - unit-tests
          filters:
            branches:
              only: master

ios_Fastlane

fastlane_version "2.61.0"

default_platform :ios

platform :ios do
  lane :beta do
    if is_ci?
      create_keychain(
        name: ENV["MATCH_KEYCHAIN_NAME"], 
        password: ENV["MATCH_KEYCHAIN_PASSWORD"],
        timeout: 1200
      )
    end

    match(type: "adhoc")

    gym(
      scheme: "darwin",
      silent: true,
      clean: true,
      sdk: "iphoneos11.1",
      export_options: { compileBitcode: false },
      export_method: "ad-hoc"
    )

    appcenter_upload(
      api_token: "",
      owner_name: "",
      group: "",
      app_name: "",
      ipa: lane_context[SharedValues::IPA_OUTPUT_PATH],
      dsym: lane_context[SharedValues::DSYM_OUTPUT_PATH],
      release_notes: (is_ci ? "This release is **automatic** from *master* branch." : "This release is **manual** from *"+git_branch+"* branch. Probably don't test it.") + "\n\n" + last_git_commit[:message],
    )

    clean_build_artifacts

    if is_ci?
      id = lane_context[SharedValues::APPCENTER_BUILD_INFORMATION]['id']
      slack(
        username: "",
        icon_url: "",
        message: "<https://install.appcenter.ms/users//apps//releases/#{id}/|iOS Releases>\n🚀 Release number: #{id}",
      )
    end
  end

  error do |lane, exception|
    if is_ci? 
      slack(
        username: "",
        icon_url: "",
        message: exception.message,
        success: false
      )
    end
  end
end