Flask Assets

---

1. Basic Asset Registration:

from flask_assets import Bundle

# Create a bundle for CSS and JavaScript
css_bundle = Bundle('styles.css')
js_bundle = Bundle('scripts.js')

# Register the bundles with the Flask application
app.config['ASSETS_DEBUG'] = True
assets_env.register('css_all', css_bundle)
assets_env.register('js_all', js_bundle)

2. Asset Caching:

# Cache assets for one year
app.config['ASSETS_CACHE'] = True
app.config['ASSETS_CACHE_MAX_AGE'] = 60 * 60 * 24 * 365

3. Asset Compression:

# Compress CSS and JavaScript assets
app.config['ASSETS_COMPRESSOR'] = 'flask_assets.compressors.GzipCompressor'

4. Asset Bundling:

# Bundle CSS and JavaScript assets together
css_bundle = Bundle('styles.css', 'vendor.css')
js_bundle = Bundle('scripts.js', 'vendor.js')

5. Asset Preprocessing:

# Preprocess Less and CoffeeScript assets
app.config['ASSETS_PREPROCESSORS'] = {
    '.less': Less('lessc'),
    '.coffee': CoffeeScript('coffee')
}

6. Asset Dependencies:

# Define dependencies for assets
css_bundle.depends('vendor.css', 'styles.css')
js_bundle.depends('vendor.js', 'scripts.js')

7. Asset Versioning:

# Enable asset versioning
app.config['ASSETS_VERSIONING'] = True

8. Asset URL Rewriting:

# Use asset URL rewriting
app.config['ASSETS_URL_REWRITING'] = True

9. Asset Manifest:

# Generate asset manifest file
app.config['ASSETS_MANIFEST'] = 'assets.json'

10. Asset Mapping:

# Map asset URLs to asset paths
asset_map = {
    'styles.css': 'css/styles.css',
    'scripts.js': 'js/scripts.js'
}

app.config['ASSETS_MAP'] = asset_map

11. Asset Debugging:

# Disable asset optimization in debug mode
app.config['ASSETS_DEBUG'] = True

12. Asset Optimization:

# Optimize assets with UglifyJS, Less, and Sass
app.config['ASSETS_OPTIMIZE'] = True
app.config['ASSETS_OPTIMIZATIONS'] = {
    'css': 'uglifycss',
    'js': 'uglifyjs',
    'less': 'less',
    'sass': 'sass'
}

13. Asset Filters:

# Define asset filters
def my_filter(text):
    ...

app.config['ASSETS_FILTERS'] = {
    'my_filter': my_filter
}

14. Asset Processor:

# Create a custom asset processor
class MyProcessor(Processor):
    ...

app.config['ASSETS_PROCESSORS'] = [MyProcessor()]

15. Asset Loader:

# Define a custom asset loader
class MyLoader(Loader):
    ...

app.config['ASSETS_LOADERS'] = [MyLoader()]

16. Async Asset Handling:

# Enable async asset handling
app.config['ASSETS_ASYNC'] = True

17. Asset Output:

# Specify asset output directory
app.config['ASSETS_OUTPUT'] = 'static/dist'

18. Asset URL:

# Get asset URL
url = assets_env.url('css_all')

19. Asset Link:

# Generate HTML link for asset
link = assets_env.make_link('css_all')

20. Asset Script:

# Generate HTML script tag for asset
script = assets_env.make_script('js_all')

21. Asset Inline:

# Inline asset into HTML
inline = assets_env.inline('css_all')

22. Asset Script Batch:

# Generate multiple HTML script tags for assets
js_scripts = assets_env.make_script_batch(['vendor.js', 'scripts.js'])

23. Asset Link Batch:

# Generate multiple HTML link tags for assets
css_links = assets_env.make_link_batch(['styles.css', 'vendor.css'])

24. Asset Version:

# Get asset version
version = assets_env.get_asset_version('styles.css')

25. Asset Dependency:

# Check if asset depends on another asset
depends = assets_env.depends('css_all', 'styles.css')

26. Asset List:

# Get list of all assets
assets = assets_env.get_all_assets()

27. Asset Blueprint:

# Register assets with a Blueprint
blueprint.register_asset_bundle('css_all', assets_env.get_asset('css_all'))
blueprint.register_asset_bundle('js_all', assets_env.get_asset('js_all'))

28. Asset Factory Function:

def create_assets(app):
    assets = Bundle('styles.css', 'vendor.css')
    assets.depends('styles.css', 'vendor.css')
    app.config['ASSETS_ENV'] = assets

29. Asset Environment Configuration:

app.config['ASSETS_ENV'] = 'production'

30. Asset Environment Override:

with assets_env.override(output='dist'):
    ...

31. Asset Environment Extension:

class MyExtension(BaseExtension):
    ...

assets_env.register_extension(MyExtension())

32. Asset Environment Reset:

assets_env.reset()

33. Asset Environment Reloading:

assets_env.reload()

34. Asset Environment Verification:

assets_env.verify()

35. Asset Environment Debug:

assets_env.debug()

36. Asset Environment Logging:

assets_env.logger.setLevel(logging.DEBUG)