* Upgrade gulp-sass to 4.0.1 and rebuild package-lock.json with npm 6
The only difference to the generated code appears to be in sourcemap data.
* Run npm audit to fix most vulnerable packages
Generated static files are unchanged by this update.
* Revert package-lock.json to npm 5 format
Updated snapshots due to the upgrade and failing ExplorerPanel test. This was due to the shallow call being made earlier than defining the document.body
Update to React 16
Update other dependencies
Stylelint updates
Remove unused imports
Update babel and gulp packages
Update package-lock
* Remove useless CSS declaration
* Remove commented out styles
* Merge duplicate declarations
* Remove even more commented out code
* Move footer mq to footer declaration
* Remove more useless code
* Stop vendor prefixing for IE below 11
* Remove useless vendor prefixing
* Merge identical declarations
* Fix 1px overflow in content wrapper
* Fix explorer scrolling when open on mobile
* Remove unused import
* Add Redux performance measurements to explorer menu
* Rewrite explorer reducer to avoid unnecessary operations
* Stop changing reducer state on every action regardless of type
* Remove redundant children.isFetching property in nodes reducer
* Remove redundant children.isLoaded property in nodes reducer
* Remove redundant children.isError property in nodes reducer
* Refactor nodes explorer reducer with sub-reducer
* Fix linting issue
* Remove unused class name
* Change default icon className from empty string to null
* Remove old TODO comment
* Hoist icons in ExplorerItem component for better performance
* Add comment
* Add tooling for performance measurement of React components
* Clean up explorer panel component definition
* Make performance measurements opt-in
* Improve alignment of page explorer menu on mobile
* Close explorer on touchend rather than touchstart
* Comment out performance measurement code
* Remove fade transition completely
* Update to the latest jest version
* Update react dependencies
* Migrate React.PropTypes to PropTypes package
* Add prop-types to the package.json
* Update transition-group import to its new package
* Update jest snapshots
* Exclude node_modules from webpack babel-loader
Move webpack configuration to a subfolder in the client directory
Remove trailing whitespace
Rename prd.config.js to prod.config.js
Simplify lint:js target path
Depending on libsass for all Wagtail installations was causing issues
with various operating systems, dramatically increasing installation
times, and preventing front end development adopting modern practices.
libsass has been removed as a dependency. Sass files are compiled before
release as a dependency of the `sdist` setup command. Sass compilation
is done through `gulp`. People wishing to hack on the frontend assets
should now install wagtail locally, install the node dependencies, and
run `gulp`:
$ pip install -e path/to/wagtail
$ cd path/to/wagtail
$ npm install
$ npm start
All the templates and JS files have been updated to reference the new
compiled CSS files instead of the Sass files.
Precompiled CSS for jquery-ui and similar have been moved out of the
`scss/` directory to the `css/` directory.
