diff --git a/.github/test-package.yml b/.github/test-package.yml
new file mode 100644
index 0000000..cdc25d9
--- /dev/null
+++ b/.github/test-package.yml
@@ -0,0 +1,64 @@
+name: Dart CI
+
+on:
+  # Run on PRs and pushes to the default branch.
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  PUB_ENVIRONMENT: bot.github
+
+jobs:
+  # Check code formatting and static analysis on a single OS (linux)
+  # against Dart dev.
+  analyze:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk: [dev]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1.0
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Check formatting
+        run: dart format --output=none --set-exit-if-changed .
+        if: always() && steps.install.outcome == 'success'
+      - name: Analyze code
+        run: dart analyze --fatal-infos
+        if: always() && steps.install.outcome == 'success'
+
+  # Run tests on a matrix consisting of two dimensions:
+  # 1. OS: ubuntu-latest, (macos-latest, windows-latest)
+  # 2. release channel: dev
+  test:
+    needs: analyze
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # Add macos-latest and/or windows-latest if relevant for this package.
+        os: [ubuntu-latest]
+        sdk: [2.12.0, dev]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1.0
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Run VM tests
+        run: dart test --platform vm
+        if: always() && steps.install.outcome == 'success'
+      - name: Run Chrome tests
+        run: dart test --platform chrome
+        if: always() && steps.install.outcome == 'success'
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7886c3d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/.dart_tool/
+/.packages
+/pubspec.lock
diff --git a/README.md b/README.md
index 5264c46..a3cfdc6 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,6 @@
 
 A library for [YAML](https://yaml.org) manipulation while preserving comments.
 
-**Disclaimer:** This is not an officially supported Google product.
-
 ## Usage
 
 A simple usage example:
diff --git a/mono_pkg.yaml b/mono_pkg.yaml
deleted file mode 100644
index 8a0e4ee..0000000
--- a/mono_pkg.yaml
+++ /dev/null
@@ -1,10 +0,0 @@
-dart:
-  - stable
-  - dev
-
-stages:
-  - analyze:
-      - analyze
-      - format
-  - tests:
-      - test