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import { SSR_INITIAL_STATE } from "./constants";
import { isServer } from "./utils/detection";
type Listener = () => void;
/**
* Creates an external store for memory state management.
* Compatible with useSyncExternalStore for React 18+ concurrent rendering.
*/
function createMemoryStore() {
let state: MemoryStoreState = { ...SSR_INITIAL_STATE };
const listeners = new Set<Listener>();
/**
* Subscribe to store updates
*/
function subscribe(listener: Listener): () => void {
listeners.add(listener);
return () => {
listeners.delete(listener);
};
}
/**
* Get current state snapshot
*/
function getSnapshot(): MemoryStoreState {
return state;
}
/**
* Get SSR-safe server snapshot
*/
function getServerSnapshot(): MemoryStoreState {
return SSR_INITIAL_STATE;
}
/**
* Notify all listeners of state change
*/
function notify(): void {
listeners.forEach((listener) => listener());
}
/**
* Update memory info in store
*/
function updateMemory(memory: MemoryInfo | null): void {
if (state.memory === memory) return;
state = {
...state,
memory,
lastUpdated: Date.now(),
};
notify();
}
/**
* Update DOM node count
*/
function updateDOMNodes(count: number | null): void {
if (state.domNodes === count) return;
state = {
...state,
domNodes: count,
lastUpdated: Date.now(),
};
notify();
}
/**
* Update event listener count
*/
function updateEventListeners(count: number | null): void {
if (state.eventListeners === count) return;
state = {
...state,
eventListeners: count,
lastUpdated: Date.now(),
};
notify();
}
/**
* Update monitoring status
*/
function updateMonitoringStatus(isMonitoring: boolean): void {
if (state.isMonitoring === isMonitoring) return;
state = {
...state,
isMonitoring,
lastUpdated: Date.now(),
};
notify();
}
/**
* Update severity level
*/
function updateSeverity(severity: Severity): void {
if (state.severity === severity) return;
state = {
...state,
severity,
lastUpdated: Date.now(),
};
notify();
}
/**
* Batch update multiple state properties
*/
function batchUpdate(updates: Partial<MemoryStoreState>): void {
const newState = { ...state, ...updates, lastUpdated: Date.now() };
// Check if anything actually changed
const hasChanges = Object.keys(updates).some(
(key) => state[key as keyof MemoryStoreState] !== updates[key as keyof MemoryStoreState]
);
if (!hasChanges) return;
state = newState;
notify();
}
/**
* Reset store to initial state
*/
function reset(): void {
state = { ...SSR_INITIAL_STATE };
notify();
}
/**
* Get current subscriber count (for debugging)
*/
function getSubscriberCount(): number {
return listeners.size;
}
return {
subscribe,
getSnapshot,
getServerSnapshot,
updateMemory,
updateDOMNodes,
updateEventListeners,
updateMonitoringStatus,
updateSeverity,
batchUpdate,
reset,
getSubscriberCount,
};
}
// Export store type
export type MemoryStore = ReturnType<typeof createMemoryStore>;
/**
* Creates a new memory store instance.
* Each hook instance should create its own store to maintain isolation.
*/
export function createStore(): MemoryStore {
return createMemoryStore();
}
/**
* Creates an SSR-safe store that returns static values on the server.
*/
export function createSSRSafeStore(): MemoryStore {
if (isServer()) {
// Return a no-op store for SSR
return {
subscribe: () => () => {},
getSnapshot: () => SSR_INITIAL_STATE,
getServerSnapshot: () => SSR_INITIAL_STATE,
updateMemory: () => {},
updateDOMNodes: () => {},
updateEventListeners: () => {},
updateMonitoringStatus: () => {},
updateSeverity: () => {},
batchUpdate: () => {},
reset: () => {},
getSubscriberCount: () => 0,
};
}
return createMemoryStore();
}
/**
* Read current memory from performance.memory API
*/
export function readMemoryFromAPI(): MemoryInfo | null {
if (isServer()) return null;
const memory = (performance as { memory?: {
usedJSHeapSize: number;
totalJSHeapSize: number;
jsHeapSizeLimit: number;
} }).memory;
if (!memory) return null;
return {
heapUsed: Math.max(0, memory.usedJSHeapSize),
heapTotal: Math.max(0, memory.totalJSHeapSize),
heapLimit: Math.max(0, memory.jsHeapSizeLimit),
timestamp: Date.now(),
};
}
/**
* Count DOM nodes in the document
*/
export function countDOMNodes(): number | null {
if (isServer()) return null;
try {
return document.querySelectorAll("*").length;
} catch {
return null;
}
}
/**
* Estimate event listener count based on interactive elements.
* This is an approximation since there's no direct API to count listeners.
*/
export function estimateEventListeners(): number | null {
if (isServer()) return null;
try {
// Count elements that commonly have event listeners
const interactiveElements = document.querySelectorAll(
'button, a, input, select, textarea, [onclick], [onchange], [onkeydown], [onkeyup], [onmouseover], [onmouseout], [onfocus], [onblur], [tabindex]'
);
// Rough estimate: each interactive element has ~1.5 listeners on average
return Math.round(interactiveElements.length * 1.5);
} catch {
return null;
}
}
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