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Building and Testing Angular 2 for JS and Dart

This document describes how to set up your development environment to build and test Angular, both JS and Dart versions. It also explains the basic mechanics of using git, node, and npm.

See the contribution guidelines if you'd like to contribute to Angular.

Prerequisite Software

Before you can build and test Angular, you must install and configure the following products on your development machine:

  • Git and/or the GitHub app (for Mac or Windows); GitHub's Guide to Installing Git is a good source of information.

  • Node.js, (version >=5.4.1 <6) which is used to run a development web server, run tests, and generate distributable files. We also use Node's Package Manager, npm (version >=3.5.3 <4.0), which comes with Node. Depending on your system, you can install Node either from source or as a pre-packaged bundle.

  • Optional: Dart (version >=1.13.2 <2.0.0), specifically the Dart SDK and Dartium (a version of Chromium with native support for Dart through the Dart VM). Visit Dart's Downloads page page for instructions. You can also download both stable and dev channel versions from the download archive. In that case, on Windows, Dart must be added to the PATH (e.g. path-to-dart-sdk-folder\bin) and a new DARTIUM_BIN environment variable must be created, pointing to the executable (e.g. path-to-dartium-folder\chrome.exe).

  • Java Development Kit which is used to execute the selenium standalone server for e2e testing.

Getting the Sources

Fork and clone the Angular repository:

  1. Login to your GitHub account or create one by following the instructions given here.
  2. Fork the main Angular repository.
  3. Clone your fork of the Angular repository and define an upstream remote pointing back to the Angular repository that you forked in the first place.
# Clone your GitHub repository:
git clone [email protected]:<github username>/angular.git

# Go to the Angular directory:
cd angular

# Add the main Angular repository as an upstream remote to your repository:
git remote add upstream https://github.com/angular/angular.git

Environment Variable Setup

Define the environment variables listed below. These are mainly needed for the testing. The notation shown here is for bash; adapt as appropriate for your favorite shell.

Examples given below of possible values for initializing the environment variables assume Mac OS X and that you have installed the Dart Editor in the directory named by DART_EDITOR_DIR=/Applications/dart. This is only for illustrative purposes.

# DARTIUM_BIN: path to a Dartium browser executable; used by Karma to run Dart tests
export DARTIUM_BIN="$DART_EDITOR_DIR/chromium/Chromium.app/Contents/MacOS/Chromium"

Add the Dart SDK bin directory to your path and/or define DART_SDK (this is also detailed here):

# DART_SDK: path to a Dart SDK directory
export DART_SDK="$DART_EDITOR_DIR/dart-sdk"

# Update PATH to include the Dart SDK bin directory
PATH+=":$DART_SDK/bin"

And specify where the pub’s dependencies are downloaded. By default, this directory is located under .pub_cache in your home directory (on Mac and Linux), or in AppData\Roaming\Pub\Cache (on Windows).

# PUB_CACHE: location of pub dependencies
export PUB_CACHE="/Users/<user>/.pub-cache"

Installing NPM Modules and Dart Packages

Next, install the JavaScript modules and Dart packages needed to build and test Angular:

# Install Angular project dependencies (package.json)
npm install

Optional: In this document, we make use of project local npm package scripts and binaries (stored under ./node_modules/.bin) by prefixing these command invocations with $(npm bin); in particular gulp and protractor commands. If you prefer, you can drop this path prefix by either:

Option 1: globally installing these two packages as follows:

  • npm install -g gulp (you might need to prefix this command with sudo)
  • npm install -g protractor (you might need to prefix this command with sudo)

Since global installs can become stale, and required versions can vary by project, we avoid their use in these instructions.

Option 2: defining a bash alias like alias nbin='PATH=$(npm bin):$PATH' as detailed in this Stackoverflow answer and used like this: e.g., nbin gulp build.

Building

To build Angular run:

./build.sh
  • Results are put in the dist folder.

Running Tests Locally

To run tests:

$ ./test.sh node

$ ./test.sh browser

$ ./test.sh tools

You should execute the 3 test suites before submitting a PR to github.

All the tests are executed on our Continuous Integration infrastructure and a PR could only be merged once the tests pass.

  • CircleCI fails if your code is not formatted properly,
  • Travis CI fails if any of the test suite describe above fails.

Update the public API tests

If you happen to modify the public API of Angular, API golden files must be updated using:

$ gulp public-api:update

Note: The command ./test.sh tools fails when the API doesn't match the golden files.

Formatting your source code

Angular uses clang-format to format the source code. If the source code is not properly formatted, the CI will fail and the PR can not be merged.

You can automatically format your code by running:

$ gulp format