wagtail/docs/contributing/javascript_guidelines.rst

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JavaScript coding guidelines
============================
Write JavaScript according to the `Airbnb Styleguide <http://github.com/airbnb/javascript>`_, with some exceptions:
- Use soft-tabs with a four space indent. Spaces are the only way to
guarantee code renders the same in any person's environment.
- We accept ``snake_case`` in object properties, such as
``ajaxResponse.page_title``, however camelCase or UPPER_CASE should be used
everywhere else.
Linting and formatting code
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wagtail provides some tooling configuration to help check your code meets the
styleguide. You'll need node.js and npm on your development machine.
Ensure project dependencies are installed by running ``npm install``
**Linting code**
``npm run lint:js``
This will lint all the JS in the wagtail project, excluding vendor
files and compiled libraries.
Some of the modals are generated via server-side scripts. These include
template tags that upset the linter, so modal workflow JavaScript is
excluded from the linter.
**Formatting code**
``npm run format:js``
This will perform safe edits to conform your JS code to the styleguide.
It won't touch the line-length, or convert quotemarks from double to single.
Run the linter after you've formatted the code to see what manual fixes
you need to make to the codebase.
**Changing the linter configuration**
Under the hood, the tasks use the `JavaScript Code Style <http://jscs.info/>`_ library.
To edit the settings for ignored files, or to change the linting rules,
edit the ``.jscsrc`` file in the wagtail project root.
A complete list of the possible linting rules can be found here:
`JSCS Rules <http://jscs.info/rules.html>`_