FSE Architecture

FSE Architecture

Project architecture and structure for the Oh My Brand! WordPress FSE theme.

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When to Use

• Understanding the project directory structure
• Locating files and understanding their purpose
• Understanding how blocks are organized
• Understanding the build process and asset flow
• Configuring theme.json settings

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Reference Files

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Project Structure

oh-my-brand/
├── AGENT.md               # AI assistant guidelines
├── functions.php          # Theme setup, hooks, registration
├── style.css              # Theme metadata (required by WP)
├── theme.json             # Global styles, settings, blocks
│
├── src/                   # Source files (@wordpress/​scripts)
│   └── blocks/           # Native WordPress blocks
│       ├── gallery/      # Gallery carousel block
│       ├── faq/          # FAQ accordion block
│       └── utils/        # Shared utilities
│
├── build/                 # Compiled output (generated)
│   └── blocks/           # Built block assets
│
├── blocks/                # ACF custom blocks
│   ├── acf-faq/          # FAQ ACF block
│   └── acf-gallery-block/# Gallery ACF block
│
├── assets/                # Static assets
│   ├── css/              # Global stylesheets
│   ├── js/               # Compiled JavaScript
│   └── icons/            # SVG icons
│
├── includes/              # PHP includes
│   ├── assets.php        # Asset registration
│   └── block-helpers.php # Block utilities
│
├── acf-json/              # ACF field groups (auto-sync)
├── patterns/              # Block patterns
├── tests/                 # Test files
└── docs/                  # Documentation

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Theme Architecture

Parent-Child Relationship

WordPress Core
      │
      ▼
Ollie Parent Theme
  • Base FSE templates
  • Default block styles
      │
      ▼
Oh My Brand! Child Theme
  • Custom blocks (native + ACF)
  • Extended theme.json
  • Brand-specific styles

File Loading Order

1. WordPress Core loads first
2. Ollie Parent Theme functions.php
3. Oh My Brand! functions.php
4. theme.json merges (child overrides parent)
5. Block assets loaded per-block when rendered

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Block Organization

Native Blocks (src/​blocks/)

Built with @wordpress/​scripts, compiled to build/​blocks/:

ACF Blocks (blocks/)

ACF PRO blocks, not compiled:

Key Differences

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Asset Pipeline

Build Process

Source                    Build Output
──────                    ────────────
src/​blocks/​gallery/
├── index.js         →    build/​blocks/​gallery/
├── edit.tsx              ├── index.js
├── view.ts               ├── view.js
├── style.css             ├── style-index.css
└── editor.css            └── index.css

Commands

Asset Loading

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Data Flow

Native Block Data Flow

block.json (attributes) → edit.tsx (editor state)
      ↓
$attributes (saved to post)
      ↓
render.php (server render)
      ↓
view.ts (frontend interactivity)

ACF Block Data Flow

ACF Field Group (acf-json/) → WordPress Editor (ACF forms)
      ↓
get_field() (post meta)
      ↓
render.php (server render)

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theme.json Configuration

Structure

See theme.json for complete structure example.

Design Tokens

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Related Skills

• native-block-development - Block creation
• acf-block-registration - ACF blocks
• css-standards - CSS and theme.json tokens
• fse-git-workflow - Development workflow

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References

• WordPress FSE Documentation
• theme.json Reference
• @wordpress/​scripts