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* CleanupTracker - Tracks and automatically cleans up module resources during HMR
*
* Prevents memory leaks by tracking timers, intervals, event listeners, and fetch
* requests created by modules. When a module is disposed during HMR, all its
* tracked resources are automatically cleaned up.
*
* @module @coherent.js/client/hmr/cleanup-tracker
*/
/**
* Tracks module resources for cleanup during HMR
*/
export class CleanupTracker {
constructor() {
/**
* Per-module resource tracking
* @type {Map<string, { timers: Set<number>, intervals: Set<number>, listeners: Array, abortControllers: Set<AbortController> }>}
*/
this.moduleResources = new Map();
}
/**
* Create a tracked context for a module
*
* Returns an object with tracked versions of setTimeout, setInterval,
* addEventListener, and fetch that automatically clean up on module disposal.
*
* @param {string} moduleId - Unique identifier for the module
* @returns {Object} Tracked context with setTimeout, setInterval, etc.
*/
createContext(moduleId) {
const resources = {
timers: new Set(),
intervals: new Set(),
listeners: [],
abortControllers: new Set(),
};
this.moduleResources.set(moduleId, resources);
const context = {
/**
* Tracked setTimeout - auto-removes from tracking on completion
* @param {Function} callback - Function to execute
* @param {number} delay - Delay in milliseconds
* @param {...*} args - Additional arguments to pass to callback
* @returns {number} Timer ID
*/
setTimeout: (callback, delay, ...args) => {
const id = setTimeout(
(...a) => {
resources.timers.delete(id);
callback(...a);
},
delay,
...args
);
resources.timers.add(id);
return id;
},
/**
* Tracked setInterval - stores in intervals set until cleared
* @param {Function} callback - Function to execute
* @param {number} delay - Interval in milliseconds
* @param {...*} args - Additional arguments to pass to callback
* @returns {number} Interval ID
*/
setInterval: (callback, delay, ...args) => {
const id = setInterval(callback, delay, ...args);
resources.intervals.add(id);
return id;
},
/**
* Clear a tracked timeout
* @param {number} id - Timer ID to clear
*/
clearTimeout: (id) => {
resources.timers.delete(id);
clearTimeout(id);
},
/**
* Clear a tracked interval
* @param {number} id - Interval ID to clear
*/
clearInterval: (id) => {
resources.intervals.delete(id);
clearInterval(id);
},
/**
* Tracked addEventListener - stores listener info for removal on cleanup
* @param {EventTarget} target - Element or object to attach listener to
* @param {string} event - Event type
* @param {Function} handler - Event handler function
* @param {Object|boolean} [options] - Listener options
*/
addEventListener: (target, event, handler, options) => {
target.addEventListener(event, handler, options);
resources.listeners.push({ target, event, handler, options });
},
/**
* Create a tracked AbortController
* @returns {AbortController} Tracked AbortController
*/
createAbortController: () => {
const controller = new AbortController();
resources.abortControllers.add(controller);
return controller;
},
/**
* Tracked fetch - creates AbortController automatically, cleans up on completion
* @param {string|URL} url - URL to fetch
* @param {Object} [options] - Fetch options
* @returns {Promise<Response>} Fetch promise
*/
fetch: (url, options = {}) => {
const controller = new AbortController();
resources.abortControllers.add(controller);
// Merge signals if one was provided
const mergedOptions = {
...options,
signal: controller.signal,
};
return fetch(url, mergedOptions).finally(() => {
resources.abortControllers.delete(controller);
});
},
};
return context;
}
/**
* Cleanup all resources for a module
*
* Called during HMR module disposal. Clears all timers, intervals,
* removes all event listeners, and aborts all pending fetch requests.
*
* @param {string} moduleId - Module identifier to clean up
*/
cleanup(moduleId) {
const resources = this.moduleResources.get(moduleId);
if (!resources) return;
// Clear all timers
for (const id of resources.timers) {
clearTimeout(id);
}
resources.timers.clear();
// Clear all intervals
for (const id of resources.intervals) {
clearInterval(id);
}
resources.intervals.clear();
// Remove all event listeners
for (const { target, event, handler, options } of resources.listeners) {
try {
target.removeEventListener(event, handler, options);
} catch {
// Target may no longer exist
}
}
resources.listeners.length = 0;
// Abort all pending fetches
for (const controller of resources.abortControllers) {
try {
controller.abort();
} catch {
// Ignore abort errors
}
}
resources.abortControllers.clear();
this.moduleResources.delete(moduleId);
}
/**
* Check for potential resource leaks (for development mode)
*
* Logs warnings if resources weren't cleaned up before module disposal.
* Call this before cleanup() to detect potential leaks.
*
* @param {string} moduleId - Module identifier to check
*/
checkForLeaks(moduleId) {
const resources = this.moduleResources.get(moduleId);
if (!resources) return;
const warnings = [];
if (resources.timers.size > 0) {
warnings.push(`${resources.timers.size} timer(s) not cleaned up`);
}
if (resources.intervals.size > 0) {
warnings.push(`${resources.intervals.size} interval(s) not cleaned up`);
}
if (resources.listeners.length > 0) {
warnings.push(`${resources.listeners.length} listener(s) not cleaned up`);
}
if (resources.abortControllers.size > 0) {
warnings.push(
`${resources.abortControllers.size} pending fetch(es) not aborted`
);
}
if (warnings.length > 0) {
console.warn(`[HMR] Potential leak in module ${moduleId}: ${warnings.join(', ')}`);
}
}
/**
* Check if a module has tracked resources
* @param {string} moduleId - Module identifier
* @returns {boolean} True if module has resources
*/
hasResources(moduleId) {
return this.moduleResources.has(moduleId);
}
/**
* Get resource counts for a module (for testing/debugging)
* @param {string} moduleId - Module identifier
* @returns {Object|null} Resource counts or null if module not tracked
*/
getResourceCounts(moduleId) {
const resources = this.moduleResources.get(moduleId);
if (!resources) return null;
return {
timers: resources.timers.size,
intervals: resources.intervals.size,
listeners: resources.listeners.length,
abortControllers: resources.abortControllers.size,
};
}
}
/**
* Singleton cleanup tracker instance
* @type {CleanupTracker}
*/
export const cleanupTracker = new CleanupTracker();
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