Building a Dart Project

What This Guide Covers #

This guide covers build environment and configuration topics specific to Dart projects. Please make sure to read our Tutorial and general build configuration guides first.

Community-Supported Warning #

Travis CI support for Dart is contributed by the community and may be removed or altered at any time. If you run into any problems, please report them in the Travis CI issue tracker and cc @athomas and @a14n.

Choosing Dart versions to test against #

Dart workers on Travis CI download and install the Dart SDK archives. See the Dart Download Archive for the list of available archives. By default, the latest stable SDK version is downloaded. To explicitly select one or more versions, use the dart key. For example:

language: dart
# Install the latest stable release
- stable
# Install the latest dev release
- dev
# Install a specific stable release - 1.15.0
- "1.15.0"
# Install a specific dev release, using a partial download URL - 1.16.0-dev.3.0
- "dev/release/1.16.0-dev.3.0"

Running Tests #

If your package depends on the test package, pub run test will be run by default. This typically only runs tests on the Dart VM, but you can configure it to run on additional platforms by default.

You can also customize the arguments Travis passes to the test runner using the dart_task field in .travis.yml.

language: dart
- test: --platform vm
- test: --platform chrome

Available Browsers #

Travis comes with Firefox and Chrome installed by default on Linux, and Safari on macOS. However, if you want to run your tests on Dartium, you’ll need to install it by adding install_dartium: true either at the top level or for a particular task.

language: dart
- test: --platform vm
- test: --platform dartium
  install_dartium: true


On Linux, the test runner uses XVFB by default so that it can use browsers like Chrome that require a display. However, this may interfere with certain applications, so you can turn it off by setting xvfb: false either at the top level or for a particular task.

language: dart
- test: --exclude-tags no-xvfb
- test: --tags no-xvfb
  xvfb: false

XVFB is never used on macOS, since it doesn’t use the X windows system.

Other Tasks #

Several tasks are available in addition to running tests.

Analyzer #

To run the Dart analyzer to verify that your code doesn’t have any static errors, add a task with dartanalyzer: true. By default it analyzes all Dart files in your repository, but you can configure it by providing arguments instead of true.

language: dart

# As long as you don't want any other configuration, you can just use the name
# of a task instead of "name: true".
- test

# Warnings are fatal, but we only analyze the lib/ directory.
- dartanalyzer: --fatal-warnings lib

Formatter #

To run the Dart formatter to verify that all your files are correctly formatted, add a task with dartfmt: true. If your package depends on the dart_style package, it’ll use that package’s formatter version; otherwise, it’ll use the dartfmt that comes with your Dart SDK.

language: dart
- test: --platform vm
- test: --platform chrome
- dartfmt

Environment Variables #

  • The version of Dart a job is using is available as TRAVIS_DART_VERSION.
  • TRAVIS_DART_TEST will be true if the current task uses test.
  • TRAVIS_DART_ANALYZE will be true if the current task uses dartanalyzer.
  • TRAVIS_DART_FORMAT will be true if the current task uses dartfmt.

Build Config Reference #

You can find more information on the build config format for Dart in our Travis CI Build Config Reference.