Continuous Integration with Node.js

Node.js is the number one language used to build projects on Shippable. This page explains yml configuration that is specific to node.js projects. For a complete yml reference, please read the YML structure section

Our yml configuration is highly customizable. Please read the following sections carefully to learn how to configure your builds.

Basic configuration

The following shippable.yml should get you started with a simple Node.js project.

language: node_js

  - 5.12.0

The snippet above will run the default commands npm install and npm test with Node.js 5.12.0. To customize this configuration, please read the sections below.

Note: If you have a yarn.lock file present in your repository we will run yarn install and npm test as the default commands.

Setting language and runtime

For Node.js projects, the language tag should always be set to node_js. You can set the runtime to any version(s) using the node_js tag:

language: node_js

  - 5.12.0

Our official build images, which are used to run your builds by default, come installed with multiple versions of Node.

To find out which versions are supported out of the box for your build image, read our languages overview for Node.

If you want to test against several versions of Node.js, you can specify multiple runtimes. The snippet below will trigger 2 builds, one against each version:

  - "0.10"
  - 7.0.0

Please note that the 0.10 version is inside double quotes. This is to prevent our parser from incorrectly interpreting the language version to be 0.1. For any version ending with a 0, remember to use double quotes around the version number.

Important note: The runtime tag only works with official CI images provided by Shippable. If you are using a custom image for your build, you will need to switch the runtime in the ci section of your yml with the nvm use <version> command.

Preparing your environment

If you're running a simple Node.js build, feel free to skip this section since you should not have to do anything to prepare the environment. Read this section only if your build needs specific environment variables or you have very custom requirements for your build image.

Overriding the default build image

Depending on the language tag in your yml, an official build image is chosen for your build by default, and your build container is started with standard options. To find out the default image used for your builds, please read the Machine images overview.

If the default image does not satisfy your requirements, you can do one of three things:

  • Continue using default image and include commands to install any missing dependencies or packages in your yml
  • Switch your Machine Image to a more recent version that contains what you need
  • Use a custom build image that contains exactly what you need for your CI. Please note that this will add time to your build since the image will be pulled from a registry.

Setting environment variables

You can define any custom environment variables in the env section of your yml. Please read the docs on Environment variables for more information.

Configuring build and test commands

The ci section should contain all commands you need for your ci workflow. Commands in this section are executed sequentially. If any command fails, we exit this section with a non zero exit code.

Installing dependencies

If needed, you can install your project dependencies using NPM in the ci section:

    - npm install -g grunt-cli

Test using npm

Following the installation of dependencies, you can include your test commands in the ci section:

    - npm test

Default behavior when no yarn.lock is present in the repository

If the ci section is blank, then we will run the default command npm install, so it has the same effect the same as the yml snippet below:

    - npm install

Default behavior yarn.lock is present in the repository

If the ci section is blank, then we will run the default command yarn install, so it has the same effect the same as the yml snippet below:

    - yarn install

Note: We will default to npm install instead of yarn install if yarn is not installed on your build image.

Test and code coverage

You can view your test and code coverage results in a consumable format and drill down further to find out which tests failed or which sections of your code were not covered by your tests.

Your tests results data needs to be in junit format and your code coverage results need to be in cobertura format in order to see these visualizations. Test and code coverage results need to be saved to shippable/testresults and shippable/codecoverage folders so that we can parse the reports.

Sample yml snippet:

  # Set environment variable for test results output
  - XUNIT_FILE=shippable/testresults/result.xml

    #Run tests
    - npm test

    #Generate coverage report with istanbul
    - ./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha -- --ui=bdd --reporter=xunit-file
    - ./node_modules/.bin/istanbul report cobertura --dir shippable/codecoverage/

Testing with older versions of node

If you want to build a project with node versions like 0.6, 0.8, 0.10, and 0.11 and want to use the same package.json, add the following line to your yml file, which will upgrade the npm to v.1.4 for node versions 0.6 and 0.8.

if [[ $SHIPPABLE_NODE_VERSION =~ [0].[6-8] ]]; then npm install -g npm@~1.4.6; fi

Advanced config

Caching node modules

To avoid installing your node modules each time, you can cache them with the following yml snippet:

  cache: true
    - $SHIPPABLE_BUILD_DIR/node_modules

Retrying installation of dependencies

Your dependencies can sometimes fail to install due to network glitches or other external transient factors. You can harden the command for installing dependencies by using shippable_retry. We will then retry the command up to 3 times if it returns a non-zero code.

    - shippable_retry sudo npm install

Sample project

Here are some links to a working sample of this scenario. This is a simple Node.js application that runs some tests and then pushes the image to Docker Hub.

Source code: devops-recipes/basic-node.

Build link: CI build on Shippable

Build status badge: Run Status