README

A Symfony bundle that combines and serves CSS/JS files as single bundled assets with intelligent HTTP caching and source map support.

Features

• File combining — merge multiple CSS or JS files into a single response
• Namespace paths — organize assets with @namespace/file.css references
• HTTP caching — automatic ETag, Last-Modified, and 304 Not Modified responses
• Source maps — v3 source map generation for combined files (configurable)
• Twig integration — themeAsset() function for easy template usage
• Performance profiling — optional Stopwatch integration

Requirements

• PHP 8.4+
• Symfony 8.0+
• Twig 3.0+ or 4.0+

Installation

composer require psychob/theme-bundle

The bundle auto-registers via Symfony Flex.

Configuration

Create or edit config/packages/theme.yaml:

theme:
    # Enable source map generation (useful in dev)
    sourcemaps: '%kernel.debug%'

    # Map namespace aliases to filesystem directories
    paths:
        '%kernel.project_dir%/assets/css': app
        '%kernel.project_dir%/vendor/some-lib/styles': lib

    # Define combined file bundles
    files:
        app.css:
            - '@app/reset.css'
            - '@app/layout.css'
            - '@lib/components.css'
            - '@app/main.css'
        app.js:
            - '@app/utils.js'
            - '@app/main.js'

Options

Usage

Twig

Use themeAsset() to generate URLs to combined files:

<link rel="stylesheet" href="{{ themeAsset('app.css') }}">
<script src="{{ themeAsset('app.js') }}"></script>

This generates URLs like /_/theme/app.css and /_/theme/app.js.

HTTP Caching

The bundle serves combined files at /_/theme/{file} with:

• ETag header for cache validation
• Last-Modified header as fallback
• 304 Not Modified responses when content hasn't changed
• Cache-Control: public, must-revalidate

Source maps are served at /_/theme/{hash}.{ext}.map with immutable, long-lived cache headers (1 year).

Namespaces

The @namespace/ prefix in file paths resolves to the directory mapped in paths:

theme:
    paths:
        '%kernel.project_dir%/assets/css': app

    files:
        app.css:
            - '@app/reset.css'   # resolves to %kernel.project_dir%/assets/css/reset.css

Development

# Run tests
composer test

# Run tests with coverage
composer test:coverage

# Static analysis
composer psalm

# Check code style
composer lint

# Fix code style
composer format

License

MPL-2.0