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* Enhanced Routing System
*
* Provides advanced routing features:
* - Route prefetching strategies
* - Page transitions
* - Code splitting per route
* - Advanced scroll behavior
*/
/**
* Create an enhanced router with advanced features
*
* @param {Object} options - Configuration options
* @param {Object} [options.prefetch] - Prefetching configuration
* @param {Object} [options.transitions] - Page transition configuration
* @param {Object} [options.codeSplitting] - Code splitting configuration
* @param {Object} [options.scrollBehavior] - Scroll behavior configuration
* @returns {Object} Enhanced router instance
*/
export function createRouter(options = {}) {
const opts = {
mode: options.mode || 'history',
base: options.base || '/',
...options
};
// Ensure nested defaults are preserved
opts.prefetch = {
enabled: false,
strategy: 'hover',
delay: 100,
maxConcurrent: 3,
priority: {
critical: 100,
high: 50,
normal: 0,
low: -50
},
...(options.prefetch || {})
};
opts.transitions = {
enabled: false,
default: {
enter: 'fade-in',
leave: 'fade-out',
duration: 300
},
routes: {},
onStart: null,
onComplete: null,
...(options.transitions || {})
};
opts.codeSplitting = {
enabled: false,
strategy: 'route',
chunkNaming: '[name]-[hash]',
preload: [],
onLoad: null,
...(options.codeSplitting || {})
};
opts.scrollBehavior = {
enabled: true,
behavior: 'smooth',
position: 'top',
delay: 0,
savePosition: true,
custom: null,
...(options.scrollBehavior || {})
};
// Router state
const state = {
routes: new Map(),
currentRoute: null,
history: [],
prefetchQueue: [],
prefetching: new Set(),
loadedChunks: new Map(),
savedPositions: new Map(),
transitionState: null
};
// Statistics
const stats = {
navigations: 0,
prefetches: 0,
transitionsCompleted: 0,
chunksLoaded: 0,
scrollRestores: 0
};
/**
* Register a route
*/
function addRoute(path, config) {
state.routes.set(path, {
path,
component: config.component,
meta: config.meta || {},
beforeEnter: config.beforeEnter,
beforeLeave: config.beforeLeave,
priority: config.priority || opts.prefetch.priority.normal,
transition: config.transition || opts.transitions.default,
lazy: typeof config.component === 'function',
loaded: !config.component || typeof config.component !== 'function',
chunk: null
});
// Preload if configured
if (opts.codeSplitting.enabled &&
Array.isArray(opts.codeSplitting.preload) &&
opts.codeSplitting.preload.includes(path)) {
loadRoute(path);
}
}
/**
* Load a route component
*/
async function loadRoute(path) {
const route = state.routes.get(path);
if (!route) {
throw new Error(`Route not found: ${path}`);
}
if (route.loaded) {
return route.component;
}
try {
const startTime = performance.now();
// Load the component
const component = await route.component();
route.component = component;
route.loaded = true;
route.chunk = opts.codeSplitting.chunkNaming
.replace('[name]', path.replace(/\//g, '-'))
.replace('[hash]', generateHash(path));
const loadTime = performance.now() - startTime;
state.loadedChunks.set(path, {
path,
loadTime,
timestamp: Date.now()
});
stats.chunksLoaded++;
if (opts.codeSplitting.onLoad) {
opts.codeSplitting.onLoad(path, component, loadTime);
}
return component;
} catch (error) {
route.loaded = false;
throw new Error(`Failed to load route ${path}: ${error.message}`);
}
}
/**
* Prefetch a route
*/
async function prefetchRoute(path, priority = opts.prefetch.priority.normal) {
if (!opts.prefetch.enabled) return;
const route = state.routes.get(path);
if (!route || route.loaded || state.prefetching.has(path)) {
return;
}
// Add to queue with priority
state.prefetchQueue.push({ path, priority });
state.prefetchQueue.sort((a, b) => b.priority - a.priority);
// Process queue
processPrefetchQueue();
}
/**
* Process prefetch queue
*/
async function processPrefetchQueue() {
// Limit concurrent prefetches
if (state.prefetching.size >= opts.prefetch.maxConcurrent) {
return;
}
const item = state.prefetchQueue.shift();
if (!item) return;
const { path } = item;
state.prefetching.add(path);
try {
await loadRoute(path);
stats.prefetches++;
} catch (error) {
console.warn(`Prefetch failed for ${path}:`, error);
} finally {
state.prefetching.delete(path);
// Process next item in queue
if (state.prefetchQueue.length > 0) {
processPrefetchQueue();
}
}
}
/**
* Setup prefetch strategy
*/
function setupPrefetchStrategy(element, path) {
if (!opts.prefetch.enabled || !element) return;
if (opts.prefetch.strategy === 'hover') {
let timeoutId;
element.addEventListener('mouseenter', () => {
timeoutId = setTimeout(() => {
prefetchRoute(path);
}, opts.prefetch.delay);
});
element.addEventListener('mouseleave', () => {
clearTimeout(timeoutId);
});
} else if (opts.prefetch.strategy === 'visible') {
const observer = new IntersectionObserver((entries) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
prefetchRoute(path);
observer.unobserve(element);
}
});
});
observer.observe(element);
} else if (opts.prefetch.strategy === 'idle') {
if ('requestIdleCallback' in window) {
requestIdleCallback(() => prefetchRoute(path));
} else {
setTimeout(() => prefetchRoute(path), 1);
}
}
}
/**
* Execute page transition
*/
async function executeTransition(from, to) {
if (!opts.transitions.enabled) return;
const transition = state.routes.get(to)?.transition || opts.transitions.default;
state.transitionState = {
from,
to,
phase: 'start'
};
if (opts.transitions.onStart) {
opts.transitions.onStart(from, to);
}
// Leave transition
state.transitionState.phase = 'leave';
await applyTransition(transition.leave, transition.duration / 2);
// Enter transition
state.transitionState.phase = 'enter';
await applyTransition(transition.enter, transition.duration / 2);
state.transitionState.phase = 'complete';
stats.transitionsCompleted++;
if (opts.transitions.onComplete) {
opts.transitions.onComplete(from, to);
}
state.transitionState = null;
}
/**
* Apply transition animation
*/
function applyTransition(animationName, duration) {
return new Promise(resolve => {
const element = document.querySelector('[data-router-view]');
if (!element) {
resolve();
return;
}
element.style.animation = `${animationName} ${duration}ms`;
setTimeout(() => {
element.style.animation = '';
resolve();
}, duration);
});
}
/**
* Handle scroll behavior
*/
function handleScroll(to, from, savedPosition) {
if (!opts.scrollBehavior.enabled) return;
// Custom scroll behavior
if (opts.scrollBehavior.custom) {
const position = opts.scrollBehavior.custom(to, from, savedPosition);
scrollToPosition(position);
return;
}
// Default scroll behavior
let position;
if (savedPosition && opts.scrollBehavior.savePosition) {
// Restore saved position
position = savedPosition;
stats.scrollRestores++;
} else if (to.hash) {
// Scroll to hash
const element = document.querySelector(to.hash);
if (element) {
position = {
el: element,
behavior: opts.scrollBehavior.behavior
};
}
} else if (opts.scrollBehavior.position === 'top') {
// Scroll to top
position = { x: 0, y: 0 };
} else if (opts.scrollBehavior.position === 'saved' && savedPosition) {
position = savedPosition;
}
if (position) {
setTimeout(() => {
scrollToPosition(position);
}, opts.scrollBehavior.delay);
}
}
/**
* Scroll to position
*/
function scrollToPosition(position) {
if (typeof window === 'undefined') return;
if (position.el) {
position.el.scrollIntoView({
behavior: position.behavior || opts.scrollBehavior.behavior
});
} else {
window.scrollTo({
left: position.x || 0,
top: position.y || 0,
behavior: position.behavior || opts.scrollBehavior.behavior
});
}
}
/**
* Save current scroll position
*/
function saveScrollPosition(path) {
if (!opts.scrollBehavior.savePosition || typeof window === 'undefined') return;
state.savedPositions.set(path, {
x: window.scrollX,
y: window.scrollY
});
}
/**
* Navigate to a route
*/
async function push(path, options = {}) {
stats.navigations++;
const from = state.currentRoute;
const to = { path, ...options };
// Save scroll position
if (from) {
saveScrollPosition(from.path);
}
try {
// Execute transition (leave phase)
if (opts.transitions.enabled) {
await executeTransition(from?.path, path);
}
// Load route component
const component = await loadRoute(path);
// Update current route
state.currentRoute = {
path,
component,
meta: state.routes.get(path)?.meta || {},
...options
};
// Add to history
state.history.push({
path,
timestamp: Date.now()
});
// Handle scroll
const savedPosition = state.savedPositions.get(path);
handleScroll(to, from, savedPosition);
return true;
} catch (error) {
console.error('Navigation failed:', error);
return false;
}
}
/**
* Replace current route
*/
async function replace(path, options = {}) {
const result = await push(path, options);
if (result && state.history.length > 1) {
// Remove the previous history entry
state.history.splice(state.history.length - 2, 1);
}
return result;
}
/**
* Go back in history
*/
function back() {
if (state.history.length > 1) {
const previous = state.history[state.history.length - 2];
push(previous.path);
}
}
/**
* Go forward (if supported by browser)
*/
function forward() {
if (typeof window !== 'undefined') {
window.history.forward();
}
}
/**
* Prefetch multiple routes
*/
function prefetchRoutes(paths, priority) {
paths.forEach(path => prefetchRoute(path, priority));
}
/**
* Get route by path
*/
function getRoute(path) {
return state.routes.get(path);
}
/**
* Get all routes
*/
function getRoutes() {
return Array.from(state.routes.values());
}
/**
* Get current route
*/
function getCurrentRoute() {
return state.currentRoute;
}
/**
* Get router statistics
*/
function getStats() {
return {
...stats,
routesRegistered: state.routes.size,
prefetchQueueSize: state.prefetchQueue.length,
activePrefetches: state.prefetching.size,
loadedChunks: state.loadedChunks.size,
savedPositions: state.savedPositions.size,
historyLength: state.history.length
};
}
/**
* Clear all caches
*/
function clearCaches() {
state.prefetchQueue = [];
state.prefetching.clear();
state.savedPositions.clear();
// Unload lazy-loaded chunks
state.routes.forEach(route => {
if (route.lazy && route.loaded) {
route.loaded = false;
}
});
state.loadedChunks.clear();
}
/**
* Generate hash for chunk naming
*/
function generateHash(input) {
let hash = 0;
for (let i = 0; i < input.length; i++) {
const char = input.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash;
}
return Math.abs(hash).toString(36).substring(0, 8);
}
// Initialize
if (opts.prefetch.enabled && opts.prefetch.strategy === 'idle') {
// Prefetch all routes on idle
if (typeof window !== 'undefined' && 'requestIdleCallback' in window) {
requestIdleCallback(() => {
state.routes.forEach((route, path) => {
if (!route.loaded) {
prefetchRoute(path, opts.prefetch.priority.low);
}
});
});
}
}
return {
addRoute,
push,
replace,
back,
forward,
prefetchRoute,
prefetchRoutes,
setupPrefetchStrategy,
getRoute,
getRoutes,
getCurrentRoute,
getStats,
clearCaches,
// Expose state for testing
_state: state
};
}
// Export default instance
export const router = createRouter();
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