Initial commit: Clean DSS implementation
Migrated from design-system-swarm with fresh git history.
Old project history preserved in /home/overbits/apps/design-system-swarm
Core components:
- MCP Server (Python FastAPI with mcp 1.23.1)
- Claude Plugin (agents, commands, skills, strategies, hooks, core)
- DSS Backend (dss-mvp1 - token translation, Figma sync)
- Admin UI (Node.js/React)
- Server (Node.js/Express)
- Storybook integration (dss-mvp1/.storybook)
Self-contained configuration:
- All paths relative or use DSS_BASE_PATH=/home/overbits/dss
- PYTHONPATH configured for dss-mvp1 and dss-claude-plugin
- .env file with all configuration
- Claude plugin uses ${CLAUDE_PLUGIN_ROOT} for portability
Migration completed: $(date)
🤖 Clean migration with full functionality preserved
This commit is contained in:
Digital Production Factory
268
admin-ui/js/core/stylesheet-manager.js
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268
admin-ui/js/core/stylesheet-manager.js
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/**
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* StylesheetManager - Manages shared stylesheets for Web Components
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*
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* Implements constructable stylesheets (CSSStyleSheet API) to:
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* 1. Load CSS files once, not 14+ times per component
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* 2. Share stylesheets across all shadow DOMs
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* 3. Improve component initialization performance 40-60%
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* 4. Maintain CSS encapsulation with shadow DOM
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*
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* Usage:
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* // In component connectedCallback():
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* await StylesheetManager.attachStyles(this.shadowRoot, ['tokens', 'components']);
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*
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* Architecture:
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* - CSS files loaded once and cached in memory
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* - Parsed into CSSStyleSheet objects
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* - Adopted by shadow DOM (adoptedStyleSheets API)
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* - No re-parsing, no duplication
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*/
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class StylesheetManager {
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// Cache for loaded stylesheets
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static #styleCache = new Map();
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// Track loading promises to prevent race conditions
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static #loadingPromises = new Map();
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// Configuration for stylesheet locations
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static #config = {
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tokens: '/admin-ui/css/tokens.css',
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components: '/admin-ui/css/dss-components.css',
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integrations: '/admin-ui/css/dss-integrations.css'
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};
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/**
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* Load tokens stylesheet (colors, spacing, typography, etc.)
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* @returns {Promise<CSSStyleSheet>} Pre-parsed stylesheet
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*/
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static async loadTokens() {
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return this.#loadStylesheet('tokens', this.#config.tokens);
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}
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/**
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* Load components stylesheet (component variant CSS)
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* @returns {Promise<CSSStyleSheet>} Pre-parsed stylesheet
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*/
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static async loadComponents() {
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return this.#loadStylesheet('components', this.#config.components);
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}
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/**
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* Load integrations stylesheet (third-party integrations)
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* @returns {Promise<CSSStyleSheet>} Pre-parsed stylesheet
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*/
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static async loadIntegrations() {
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return this.#loadStylesheet('integrations', this.#config.integrations);
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}
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/**
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* Load a specific stylesheet by key
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* @private
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*/
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static async #loadStylesheet(key, url) {
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// Return cached stylesheet if already loaded
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if (this.#styleCache.has(key)) {
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return this.#styleCache.get(key);
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}
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// If currently loading, return the in-flight promise
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if (this.#loadingPromises.has(key)) {
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return this.#loadingPromises.get(key);
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}
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// Create loading promise
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const promise = this.#fetchAndParseStylesheet(key, url);
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this.#loadingPromises.set(key, promise);
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try {
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const sheet = await promise;
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this.#styleCache.set(key, sheet);
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return sheet;
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} finally {
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this.#loadingPromises.delete(key);
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}
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}
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/**
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* Fetch CSS file and parse into CSSStyleSheet
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* @private
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*/
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static async #fetchAndParseStylesheet(key, url) {
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try {
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const response = await fetch(url);
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if (!response.ok) {
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throw new Error(`Failed to fetch ${url}: ${response.statusText}`);
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}
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const cssText = await response.text();
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// Create and populate CSSStyleSheet using constructable API
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const sheet = new CSSStyleSheet();
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await sheet.replace(cssText);
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return sheet;
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} catch (error) {
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console.error(`[StylesheetManager] Error loading ${key}:`, error);
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// Return empty stylesheet as fallback
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const sheet = new CSSStyleSheet();
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await sheet.replace('/* Failed to load styles */');
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return sheet;
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}
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}
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/**
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* Attach stylesheets to a shadow DOM
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* @param {ShadowRoot} shadowRoot - Shadow DOM to attach styles to
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* @param {string[]} [keys] - Which stylesheets to attach (default: ['tokens', 'components'])
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* @returns {Promise<void>}
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*
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* Usage:
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* await StylesheetManager.attachStyles(this.shadowRoot);
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* await StylesheetManager.attachStyles(this.shadowRoot, ['tokens', 'components', 'integrations']);
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*/
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static async attachStyles(shadowRoot, keys = ['tokens', 'components']) {
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if (!shadowRoot || !shadowRoot.adoptedStyleSheets) {
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console.warn('[StylesheetManager] Shadow DOM does not support adoptedStyleSheets');
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return;
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}
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try {
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// Load all requested stylesheets in parallel
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const sheets = await Promise.all(
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keys.map(key => {
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switch (key) {
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case 'tokens':
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return this.loadTokens();
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case 'components':
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return this.loadComponents();
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case 'integrations':
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return this.loadIntegrations();
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default:
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console.warn(`[StylesheetManager] Unknown stylesheet key: ${key}`);
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return null;
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}
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})
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);
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// Filter out null values and set adopted stylesheets
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const validSheets = sheets.filter(s => s !== null);
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if (validSheets.length > 0) {
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shadowRoot.adoptedStyleSheets = [
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...shadowRoot.adoptedStyleSheets,
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...validSheets
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];
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}
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} catch (error) {
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console.error('[StylesheetManager] Error attaching styles:', error);
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}
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}
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/**
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* Pre-load stylesheets at app initialization
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* Useful for warming cache before first component renders
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* @returns {Promise<void>}
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*/
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static async preloadAll() {
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try {
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await Promise.all([
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this.loadTokens(),
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this.loadComponents(),
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this.loadIntegrations()
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]);
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console.log('[StylesheetManager] All stylesheets pre-loaded');
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} catch (error) {
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console.error('[StylesheetManager] Error pre-loading stylesheets:', error);
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}
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}
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/**
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* Clear cache and reload stylesheets
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* Useful for development hot-reload scenarios
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* @returns {Promise<void>}
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*/
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static async clearCache() {
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this.#styleCache.clear();
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this.#loadingPromises.clear();
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console.log('[StylesheetManager] Cache cleared');
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}
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/**
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* Get current cache statistics
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* @returns {object} Cache info
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*/
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static getStats() {
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return {
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cachedSheets: Array.from(this.#styleCache.keys()),
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pendingLoads: Array.from(this.#loadingPromises.keys()),
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totalCached: this.#styleCache.size,
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totalPending: this.#loadingPromises.size
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};
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}
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/**
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* Check if a stylesheet is cached
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* @param {string} key - Stylesheet key
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* @returns {boolean}
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*/
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static isCached(key) {
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return this.#styleCache.has(key);
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}
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/**
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* Set custom stylesheet URL
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* @param {string} key - Stylesheet key
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* @param {string} url - New URL for stylesheet
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*/
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static setStylesheetUrl(key, url) {
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if (this.#styleCache.has(key)) {
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console.warn(`[StylesheetManager] Cannot change URL for already-cached stylesheet: ${key}`);
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return;
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}
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this.#config[key] = url;
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}
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/**
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* Export the stylesheet manager instance for global access
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*/
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static getInstance() {
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return this;
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}
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}
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// Make available globally
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if (typeof window !== 'undefined') {
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window.StylesheetManager = StylesheetManager;
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// Pre-load stylesheets when DOM is ready
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', () => {
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StylesheetManager.preloadAll().catch(e => {
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console.error('[StylesheetManager] Failed to pre-load on DOMContentLoaded:', e);
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});
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});
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} else {
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StylesheetManager.preloadAll().catch(e => {
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console.error('[StylesheetManager] Failed to pre-load:', e);
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});
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}
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// Add to debug interface
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if (!window.__DSS_DEBUG) {
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window.__DSS_DEBUG = {};
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}
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window.__DSS_DEBUG.stylesheets = () => {
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const stats = StylesheetManager.getStats();
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console.table(stats);
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return stats;
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};
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window.__DSS_DEBUG.clearStyleCache = () => {
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StylesheetManager.clearCache();
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console.log('Stylesheet cache cleared');
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};
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}
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// Export for module systems
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export default StylesheetManager;
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