# Flask Assets

***

**1. Basic Asset Registration:**

```python
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:**

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

**3. Asset Compression:**

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

**4. Asset Bundling:**

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

**5. Asset Preprocessing:**

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

**6. Asset Dependencies:**

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

**7. Asset Versioning:**

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

**8. Asset URL Rewriting:**

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

**9. Asset Manifest:**

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

**10. Asset Mapping:**

```python
# 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:**

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

**12. Asset Optimization:**

```python
# 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:**

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

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

**14. Asset Processor:**

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

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

**15. Asset Loader:**

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

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

**16. Async Asset Handling:**

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

**17. Asset Output:**

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

**18. Asset URL:**

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

**19. Asset Link:**

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

**20. Asset Script:**

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

**21. Asset Inline:**

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

**22. Asset Script Batch:**

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

**23. Asset Link Batch:**

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

**24. Asset Version:**

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

**25. Asset Dependency:**

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

**26. Asset List:**

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

**27. Asset Blueprint:**

```python
# 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:**

```python
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:**

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

**30. Asset Environment Override:**

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

**31. Asset Environment Extension:**

```python
class MyExtension(BaseExtension):
    ...

assets_env.register_extension(MyExtension())
```

**32. Asset Environment Reset:**

```python
assets_env.reset()
```

**33. Asset Environment Reloading:**

```python
assets_env.reload()
```

**34. Asset Environment Verification:**

```python
assets_env.verify()
```

**35. Asset Environment Debug:**

```python
assets_env.debug()
```

**36. Asset Environment Logging:**

```python
assets_env.logger.setLevel(logging.DEBUG)
```