97 lines
3.9 KiB
ReStructuredText
97 lines
3.9 KiB
ReStructuredText
==========================================
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Firefox Welcome Experience (about:welcome)
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==========================================
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Files related to the Firefox welcome experience, which includes content that appears on ``about:welcome``, can be found in the ``browser/components/aboutwelcome`` directory.
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Some of these source files (such as ``.js``, ``.jsx``, and ``.scss``) require an additional build step.
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We are working on migrating this to work with ``mach``, but in the meantime, please
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follow the following steps if you need to make changes in this directory:
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For ``.sys.mjs`` files (system modules)
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---------------------------------------------------
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No build step is necessary. Use ``mach`` and run mochitests according to your regular Firefox workflow.
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For ``.js``, ``.jsx``, ``.scss``, or ``.css`` files
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---------------------------------------------------
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Prerequisites
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`````````````
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You will need the following:
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- Node.js 10+ (On Mac, the best way to install Node.js is to use the install link on the `Node.js homepage`_)
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- npm (packaged with Node.js)
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To install dependencies, run the following from the root of the mozilla-central repository.
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(Using ``mach`` to call ``npm`` and ``node`` commands will ensure you're using the correct versions of Node and npm.)
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.. code-block:: shell
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(cd browser/components/aboutwelcome && ../../../mach npm install)
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Which files should you edit?
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````````````````````````````
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You should not make changes to ``.js`` or ``.css`` files in the ``browser/components/aboutwelcome/content`` directory. Instead, you should edit the ``.jsx``, ``.js``, and ``.scss`` source files
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in ``browser/components/aboutwelcome/content-src`` directory. These files will be compiled into the ``.js`` and ``.css`` files.
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Building assets and running Firefox
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-----------------------------------
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To build assets and run Firefox, run the following from the root of the mozilla-central repository:
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.. code-block:: shell
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./mach npm run bundle --prefix=browser/components/aboutwelcome && ./mach build && ./mach run
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Continuous development / debugging
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----------------------------------
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Running ``./mach npm run watchmc --prefix=browser/components/aboutwelcome`` will start a process that watches files in
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``aboutwelcome`` and rebuilds the bundled files when JS or CSS files change.
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**IMPORTANT NOTE**: This task will add inline source maps to help with debugging, which changes the memory footprint.
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Do not use the ``watchmc`` task for profiling or performance testing!
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Running tests
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-------------
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About:welcome unit tests are written using
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`mocha <https://mochajs.org>`_, and other errors that may show up there are
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`SCSS <https://sass-lang.com/documentation/syntax>`_ issues flagged by
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`stylelint <https://stylelint.io>`_. These things are all run using
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``npm test`` under the ``aboutwelcome`` slug in Treeherder/Try, so if that slug turns
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red, these tests are what is failing. To execute them, do this:
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.. code-block:: shell
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./mach npm test --prefix=browser/components/aboutwelcome
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Windows isn't currently supported by ``npm test``
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(`path/invocation difference <https://bugzilla.mozilla.org/show_bug.cgi?id=1737419>`_).
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To run tests that aren't covered by ``mach lint`` and
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``mach test``:
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.. code-block:: shell
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./mach npm run lint:stylelint --prefix=browser/components/aboutwelcome
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./mach npm run testmc:build --prefix=browser/components/aboutwelcome
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./mach npm run testmc:unit --prefix=browser/components/aboutwelcome
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Mochitests run normally, using ``mach test browser/components/aboutwelcome``.
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Code Coverage
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-------------
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Our testing setup will run code coverage tools in addition to just the unit
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tests. It will error out if the code coverage metrics don't meet certain thresholds.
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If you see any missing test coverage, you can inspect the coverage report by
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running
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.. code-block:: shell
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./mach npm test --prefix=browser/components/aboutwelcome &&
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./mach npm run debugcoverage --prefix=browser/components/aboutwelcome
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.. _Node.js homepage: https://nodejs.org/
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