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* @file watcher.js
* @description General-purpose state watcher and reactivity dependency tracking for Avenx-JS.
*/
import { tracer } from '../trace/tracer.js';
import { traceWatcher } from '../trace/reactive.js';
/**
* WeakMap tracking raw target to Map of keys to Set of active Watchers depending on them.
* @type {WeakMap<object, Map<string, Set<AvenxWatcher>>>}
*/
export const depMap = new WeakMap();
/**
* WeakMap tracking nested child targets to their parent relationship.
* @type {WeakMap<object, {parentTarget: object, parentKey: string}>}
*/
export const parentMap = new WeakMap();
/**
* The currently active watcher evaluating a reactive expression/function.
* @type {AvenxWatcher|null}
*/
export let activeWatcher = null;
/**
* Call stack of active watchers.
* @type {AvenxWatcher[]}
*/
const watcherStack = [];
/**
* Pushes a watcher onto the active evaluation context stack.
* @param {AvenxWatcher} watcher - The watcher instance to run.
*/
export function pushWatcher(watcher) {
watcherStack.push(activeWatcher);
activeWatcher = watcher;
}
/**
* Pops the active watcher context from the stack.
*/
export function popWatcher() {
activeWatcher = watcherStack.pop();
}
let debugReactivity = false;
/**
* Programmatically enables or disables debug reactivity logging.
* @param {boolean} enabled
*/
export function setDebugReactivity(enabled) {
debugReactivity = Boolean(enabled);
}
/**
* Returns whether debug reactivity logging is currently enabled.
* @returns {boolean}
*/
export function isDebugReactivityEnabled() {
if (typeof globalThis !== 'undefined' && typeof globalThis.__avenx_debug_reactivity__ === 'boolean') {
return globalThis.__avenx_debug_reactivity__;
}
return debugReactivity;
}
/**
* Formats a value for debug logging output.
* @param {any} val
* @returns {string}
*/
export function formatValue(val) {
if (typeof val === 'string') {
return `"${val}"`;
}
if (val === undefined) {
return 'undefined';
}
if (val === null) {
return 'null';
}
if (typeof val === 'symbol') {
return val.toString();
}
if (typeof val === 'object') {
try {
return JSON.stringify(val);
} catch {
return String(val);
}
}
return String(val);
}
/**
* Constructs the full property path from a target object and key using parentMap.
* @param {object} target
* @param {string|symbol} key
* @returns {string}
*/
export function getPropertyPath(target, key) {
const parts = [];
if (key !== undefined && key !== null) {
parts.unshift(String(key));
}
let current = target;
while (current) {
const relation = parentMap.get(current);
if (!relation) break;
parts.unshift(String(relation.parentKey));
current = relation.parentTarget;
}
return parts.join('.');
}
/**
* Tracks a property access on a target, establishing a dependency relationship.
* @param {object} target - The raw reactive target object.
* @param {string} key - The property key accessed.
*/
export function track(target, key) {
if (activeWatcher) {
let keysMap = depMap.get(target);
if (!keysMap) {
keysMap = new Map();
depMap.set(target, keysMap);
}
let watchers = keysMap.get(key);
if (!watchers) {
watchers = new Set();
keysMap.set(key, watchers);
}
watchers.add(activeWatcher);
activeWatcher.addDep(target, key, watchers);
if (isDebugReactivityEnabled()) {
const propPath = getPropertyPath(target, key);
const watcherName = activeWatcher.name || (activeWatcher.options && activeWatcher.options.name) || 'anonymous';
console.log(`[Avenx Debug] Tracked property "${propPath}" by Watcher "${watcherName}"`);
}
}
}
import { AvenxErrorCodes, formatMessage } from '../runtime/AvenxError.js';
import { logger } from '../runtime/AvenxLogger.js';
let triggerDepth = 0;
const MAX_TRIGGER_DEPTH = 50;
const triggeredWatchers = new Set();
const activeUpdatingWatchers = new Set();
const causationTrace = [];
/**
* Renders one causation entry.
*
* Entries are recorded as `{target, key}` rather than as a formatted path: the
* path walks the parent chain and joins strings, and it was built on *every*
* write for a diagnostic that fires only when a cycle is detected. A watcher
* name is already a string and is kept as one.
* @param {object|string} entry - A recorded entry.
* @returns {string} The property path or watcher label.
*/
function formatCausationEntry(entry) {
return typeof entry === 'string' ? entry : getPropertyPath(entry.target, entry.key);
}
/**
* Returns the current active causation trace for diagnostics.
* @returns {string[]}
*/
export function getActiveCausationTrace() {
return causationTrace.map(formatCausationEntry);
}
/**
* Clears the causation trace log.
*/
export function clearCausationTrace() {
causationTrace.length = 0;
}
/**
* Triggers all watchers registered to a mutated property, and propagates to parent nodes.
* @param {object} target - The raw target where mutation occurred.
* @param {string} key - The property key mutated.
* @param {any} [oldValue] - Previous value before mutation.
* @param {any} [newValue] - New value after mutation.
*/
export function trigger(target, key, oldValue, newValue) {
if (triggerDepth === 0) {
triggeredWatchers.clear();
causationTrace.length = 0;
}
triggerDepth++;
if (triggerDepth > MAX_TRIGGER_DEPTH) {
const cycleStr = causationTrace.slice(-6).map(formatCausationEntry).join(' -> ') || 'synchronous-watcher-cycle';
logger.error(
formatMessage(
AvenxErrorCodes.REACTIVE_DEADLOCK_DETECTED,
' (synchronous cascade loop)',
` ${cycleStr}\n\nSynchronous mutation cascade exceeded ${MAX_TRIGGER_DEPTH} levels. Aborted.`
)
);
triggerDepth--;
return;
}
try {
const keys = Array.isArray(key) ? key : [key];
for (const k of keys) {
if (typeof k !== 'symbol') {
causationTrace.push({ target, key: k });
}
}
if (isDebugReactivityEnabled()) {
for (const k of keys) {
if (typeof k !== 'symbol') {
const propPath = getPropertyPath(target, k);
const oldFormatted = formatValue(oldValue);
const newFormatted = formatValue(newValue);
console.log(`[Avenx Debug] Triggered property "${propPath}" (old: ${oldFormatted}, new: ${newFormatted}) -> scheduling update`);
}
}
}
const keysMap = depMap.get(target);
if (keysMap) {
for (const k of keys) {
const watchers = keysMap.get(k);
if (watchers) {
// Copy to prevent concurrent modification issues during execution
const toRun = new Set(watchers);
for (const watcher of toRun) {
if (activeUpdatingWatchers.has(watcher)) {
const cycleStr = `${watcher.name || 'anonymous'} -> ${causationTrace.map(formatCausationEntry).join(' -> ')} -> ${watcher.name || 'anonymous'}`;
logger.error(
formatMessage(
AvenxErrorCodes.REACTIVE_DEADLOCK_DETECTED,
' (synchronous watcher cycle)',
` ${cycleStr}\n\nSynchronous watcher cycle detected. Execution aborted to prevent stack overflow.`
)
);
continue;
}
if (!triggeredWatchers.has(watcher)) {
triggeredWatchers.add(watcher);
if (watcher.name) {
causationTrace.push(`[${watcher.name}]`);
}
if (typeof watcher.update === 'function') {
// Recorded inside the write's causal scope, so the trace reads
// "this property changed, and that woke this watcher". The
// ephemeral causationTrace above is kept as-is: it exists to
// describe a deadlock at the moment one is detected, and is
// cleared as the cascade unwinds.
const token = tracer.on ? traceWatcher(watcher) : -1;
try {
watcher.update();
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
}
}
}
}
}
// Propagate triggering to parents in case target is a nested object
const parentRelation = parentMap.get(target);
if (parentRelation) {
const { parentTarget, parentKey } = parentRelation;
trigger(parentTarget, parentKey, oldValue, newValue);
}
} finally {
triggerDepth--;
if (triggerDepth === 0) {
causationTrace.length = 0;
}
}
}
/**
* Recursively traverses a reactive value to register deep dependencies.
* @param {any} value
* @param {Set<any>} [seen]
*/
function traverse(value, seen = new Set()) {
if (value === null || typeof value !== 'object') {
return;
}
if (seen.has(value)) {
return;
}
seen.add(value);
if (Array.isArray(value)) {
for (let i = 0; i < value.length; i++) {
traverse(value[i], seen);
}
} else {
for (const key of Object.keys(value)) {
traverse(value[key], seen);
}
}
}
/**
* AvenxWatcher handles dependency tracking, caching, lazy/immediate callbacks,
* and lifecycle cleanup for reactive expressions.
*/
export class AvenxWatcher {
#isPaused = false;
/**
* @param {Function|Array<Function>} getter - The reactive evaluation function.
* @param {Function|null} [callback] - Callback triggered when evaluated value changes.
* @param {object} [options] - Configuration options.
* @param {boolean} [options.immediate] - Run the callback immediately with initial value.
* @param {boolean} [options.lazy] - Postpone the initial evaluation until first accessed.
*/
constructor(getter, callback = null, options = {}) {
if (typeof callback === 'object' && callback !== null) {
options = callback;
callback = null;
}
/** @type {boolean} */
this.isArray = Array.isArray(getter);
/** @type {Function|Array<Function>} */
this.getter = getter;
/** @type {Function|null} */
this.callback = typeof callback === 'function' ? callback : null;
/** @type {object} */
this.options = options || {};
/** @type {boolean} */
this.isEffect = !this.callback || !!options.isEffect || !!options.effect;
/** @type {string} */
this.name = (options && (options.name || options.id)) || (Array.isArray(getter) ? 'multi-watcher' : (getter && getter.name)) || 'anonymous';
/** @type {Set<{target: object, key: string, watchersSet: Set<AvenxWatcher>}>} */
this.deps = new Map();
/** @type {boolean} */
this.dirty = true;
/** @type {any} */
this.value = undefined;
/** @type {any} */
this.debounceTimer = null;
/** @type {any} */
this.throttleTimer = null;
/** @type {number} */
this.lastExecTime = 0;
/** @type {any} */
this.pendingNewValue = undefined;
/** @type {any} */
this.pendingOldValue = undefined;
if (!options.lazy) {
this.value = this.get();
this.dirty = false;
}
if (options.immediate && this.callback) {
this.callback(this.value, undefined);
}
}
/**
* Pauses watcher execution.
*/
pause() {
this.#isPaused = true;
}
/**
* Resumes watcher execution.
*/
resume() {
this.#isPaused = false;
}
/**
* Evaluates the getter function inside the watcher context to track reactive dependencies.
* @returns {any}
*/
get() {
pushWatcher(this);
const oldDeps = this.deps;
this.deps = new Map();
try {
let value;
if (this.isArray) {
value = this.getter.map((fn) => fn());
} else {
value = this.getter();
}
if (this.options.deep) {
traverse(value);
}
this.cleanupDeps(oldDeps);
return value;
} catch (err) {
this.deps = oldDeps;
throw err;
} finally {
popWatcher();
}
}
/**
* Evaluates a lazy computed watcher if it is dirty.
* @returns {any}
*/
evaluate() {
if (this.dirty) {
this.value = this.get();
this.dirty = false;
}
return this.value;
}
/**
* Registers a target property dependency on this watcher.
* @param {object} target - Reactive object target.
* @param {string} key - Property key.
* @param {Set<AvenxWatcher>} watchersSet - Set mapping to this dependency.
*/
addDep(target, key, watchersSet) {
// Keyed by the watcher set rather than scanned for it. A render effect
// reads every value it displays, so a component with a few hundred
// bindings made this a linear scan per read -- quadratic in the number of
// reads, on the hot path of every evaluation.
if (!this.deps.has(watchersSet)) {
this.deps.set(watchersSet, { target, key, watchersSet });
}
}
/**
* Compares active dependencies against old dependencies and unsubscribes from stale dependencies.
* @param {Set<{target: object, key: string, watchersSet: Set<AvenxWatcher>}>} oldDeps
*/
cleanupDeps(oldDeps) {
for (const [watchersSet] of oldDeps) {
if (!this.deps.has(watchersSet)) {
watchersSet.delete(this);
}
}
}
/**
* Executes the watcher callback, applying debounce or throttle timing if configured.
* @param {any} newValue
* @param {any} oldValue
*/
run(newValue, oldValue) {
if (!this.callback) return;
if (typeof this.options.debounce === 'number' && this.options.debounce > 0) {
if (this.debounceTimer) {
clearTimeout(this.debounceTimer);
}
if (this.pendingOldValue === undefined) {
this.pendingOldValue = oldValue;
}
this.pendingNewValue = newValue;
this.debounceTimer = setTimeout(() => {
const toNew = this.pendingNewValue;
const toOld = this.pendingOldValue;
this.pendingNewValue = undefined;
this.pendingOldValue = undefined;
this.debounceTimer = null;
if (this.callback) {
this.callback(toNew, toOld);
}
}, this.options.debounce);
return;
}
if (typeof this.options.throttle === 'number' && this.options.throttle > 0) {
const now = Date.now();
const remaining = this.options.throttle - (now - (this.lastExecTime || 0));
if (this.pendingOldValue === undefined) {
this.pendingOldValue = oldValue;
}
this.pendingNewValue = newValue;
if (remaining <= 0 || remaining > this.options.throttle) {
if (this.throttleTimer) {
clearTimeout(this.throttleTimer);
this.throttleTimer = null;
}
this.lastExecTime = now;
const toNew = this.pendingNewValue;
const toOld = this.pendingOldValue;
this.pendingNewValue = undefined;
this.pendingOldValue = undefined;
this.callback(toNew, toOld);
} else if (!this.throttleTimer) {
this.throttleTimer = setTimeout(() => {
this.lastExecTime = Date.now();
this.throttleTimer = null;
const toNew = this.pendingNewValue;
const toOld = this.pendingOldValue;
this.pendingNewValue = undefined;
this.pendingOldValue = undefined;
if (this.callback) {
this.callback(toNew, toOld);
}
}, remaining);
}
return;
}
this.callback(newValue, oldValue);
}
/**
* Updates the watcher value and triggers evaluation or callback execution.
*/
update() {
if (this.#isPaused) return;
if (activeUpdatingWatchers.has(this)) {
const cycleStr = `${this.name} -> ${causationTrace.map(formatCausationEntry).join(' -> ')} -> ${this.name}`;
logger.error(
formatMessage(
AvenxErrorCodes.REACTIVE_DEADLOCK_DETECTED,
' (synchronous watcher cycle)',
` ${cycleStr}\n\nSynchronous watcher cycle detected. Execution aborted to prevent stack overflow.`
)
);
return;
}
activeUpdatingWatchers.add(this);
try {
if (this.isEffect) {
if (typeof this.options.debounce === 'number' && this.options.debounce > 0) {
if (this.debounceTimer) {
clearTimeout(this.debounceTimer);
}
this.debounceTimer = setTimeout(() => {
this.debounceTimer = null;
if (!this.#isPaused) {
this.value = this.get();
}
}, this.options.debounce);
return;
}
if (typeof this.options.throttle === 'number' && this.options.throttle > 0) {
const now = Date.now();
const remaining = this.options.throttle - (now - (this.lastExecTime || 0));
if (remaining <= 0 || remaining > this.options.throttle) {
if (this.throttleTimer) {
clearTimeout(this.throttleTimer);
this.throttleTimer = null;
}
this.lastExecTime = now;
this.value = this.get();
} else if (!this.throttleTimer) {
this.throttleTimer = setTimeout(() => {
this.lastExecTime = Date.now();
this.throttleTimer = null;
if (!this.#isPaused) {
this.value = this.get();
}
}, remaining);
}
return;
}
this.value = this.get();
} else if (this.options.lazy) {
this.dirty = true;
if (this.callback) {
this.run(this.value, this.value);
}
} else {
const oldValue = this.value;
const newValue = this.get();
let hasChanged;
if (this.isArray) {
if (!Array.isArray(oldValue) || newValue.length !== oldValue.length) {
hasChanged = true;
} else {
hasChanged = newValue.some(
(val, i) => val !== oldValue[i] || (val && typeof val === 'object'),
);
}
} else {
hasChanged =
newValue !== oldValue || (newValue && typeof newValue === 'object');
}
if (hasChanged) {
this.value = newValue;
if (this.callback) {
this.run(newValue, oldValue);
}
}
}
} finally {
activeUpdatingWatchers.delete(this);
}
}
/**
* Cleans up all registered dependencies of this watcher to prevent memory leaks.
*/
teardown() {
if (this.debounceTimer) {
clearTimeout(this.debounceTimer);
this.debounceTimer = null;
}
if (this.throttleTimer) {
clearTimeout(this.throttleTimer);
this.throttleTimer = null;
}
this.pendingNewValue = undefined;
this.pendingOldValue = undefined;
for (const [watchersSet] of this.deps) {
watchersSet.delete(this);
}
this.deps.clear();
}
}
/**
* Creates an immediate effect watcher that automatically tracks reactive state properties accessed during execution and re-runs on mutation.
* @param {Function} effect - The side-effect function to execute and track.
* @param {object} [options] - Configuration options (e.g. debounce, throttle, deep, name).
* @returns {Function} Stop handle function () => watcher.teardown().
*/
export function watchEffect(effect, options = {}) {
if (typeof effect !== 'function') {
throw new Error('watchEffect requires an effect function');
}
const watcher = new AvenxWatcher(effect, null, options);
const stop = () => watcher.teardown();
stop.watcher = watcher;
return stop;
}
|