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======================
Firefox Home (New Tab)
======================
All files related to Firefox Home, which includes content that appears on `about:home`,
`about:newtab`, and `about:welcome`, can be found in the `browser/components/newtab` directory.
Some of these source files (such as `.js`, `.jsx`, and `.sass`) require an additional build step.
We are working on migrating this to work with `mach`, but in the meantime, please
follow the following steps if you need to make changes in this directory:
For .jsm files
---------------
No build step is necessary. Use `mach` and run mochitests according to your regular Firefox workflow.
For .js, .jsx, .sass, or .css files
-----------------------------------
Prerequisites
`````````````
You will need the following:
- Node.js 10+ (On Mac, the best way to install Node.js is to use the install link on the `Node.js homepage`_)
- npm (packaged with Node.js)
To install dependencies, run the following from the root of the mozilla-central repository
(or cd into browser/components/newtab to omit the `--prefix` in any of these commands):
.. code-block:: shell
npm install --prefix browser/components/newtab
Which files should you edit?
````````````````````````````
You should not make changes to `.js` or `.css` files in `browser/components/newtab/css` or
`browser/components/newtab/data` directory. Instead, you should edit the `.jsx`, `.js`, and `.sass` files
in `browser/components/newtab/content-src` directory.
Building assets and running Firefox
-----------------------------------
To build assets and run Firefox, run the following from the root of the mozilla-central repository:
.. code-block:: shell
npm run bundle --prefix browser/components/newtab && ./mach build && ./mach run
Continuous development / debugging
----------------------------------
Running `npm run watchmc` will start a process that watches files in
`activity-stream` and rebuilds the bundled files when JS or CSS files change.
**IMPORTANT NOTE**: This task will add inline source maps to help with debugging, which changes the memory footprint.
Do not use the `watchmc` task for profiling or performance testing!
Running tests
-------------
The majority of New Tab / Messaging unit tests are written using
`mocha <https://mochajs.org>`_, and other errors that may show up there are
`SCSS <https://sass-lang.com/documentation/syntax>`_ issues flagged by
`sasslint <https://github.com/sasstools/sass-lint/tree/master>`_. These things
are all run using `npm test` under the `newtab` slug in Treeherder/Try, so if
that slug turns red, these tests are what is failing. To execute them, do this:
.. code-block:: shell
cd browser/components/newtab
npm test
These tests are not currently run by `mach test`, but there's a
`task filed to fix that <https://bugzilla.mozilla.org/show_bug.cgi?id=1581165>`_.
Mochitests and xpcshell tests run normally, using `mach test`.
Code Coverage
-------------
Our testing setup will run code coverage tools in addition to just the unit
tests. It will error out if the code coverage metrics don't meet certain thresholds.
If you see any missing test coverage, you can inspect the coverage report by
running
.. code-block:: shell
npm test && npm run debugcoverage
Detailed Docs
-------------
.. toctree::
:titlesonly:
:glob:
v2-system-addon/*
.. _Node.js homepage: https://nodejs.org/
|
