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* @file proxyHandler.js
* @description Factory for creating proxy handlers used in reactive state.
* Handles normal property access and computed property redirection.
*/
import { track, trigger, parentMap, AvenxWatcher, depMap, getPropertyPath, setDebugReactivity, isDebugReactivityEnabled } from './watcher.js';
import {
RAW_SYMBOL,
IS_REACTIVE_PROXY,
PROXY_REF_SYMBOL,
NON_REACTIVE_SYMBOL,
} from './symbols.js';
import { tracer } from '../trace/tracer.js';
import { traceWrite, traceCollectionWrite } from '../trace/reactive.js';
import { journal, setPathResolver } from './journal.js';
// The journal names a conflicted path in its report; the naming rules already
// live in the watcher. Injecting the resolver keeps the journal free of the
// watcher's surface while still producing "cart.items.0.qty" rather than "qty".
setPathResolver(getPropertyPath);
export { setDebugReactivity, isDebugReactivityEnabled };
// The symbols moved to ./symbols.js so consumers that only need to recognise a
// reactive value can import them without pulling in the proxy factory. They are
// re-exported here unchanged, so every existing importer is unaffected.
export { RAW_SYMBOL, IS_REACTIVE_PROXY, PROXY_REF_SYMBOL, NON_REACTIVE_SYMBOL };
const mutatingArrayMethods = new Set([
'push',
'pop',
'shift',
'unshift',
'splice',
'sort',
'reverse',
'copyWithin',
'fill',
]);
/**
* Checks if the value is a candidate for reactive wrapping.
* We restrict this to plain objects and arrays to avoid issues with
* built-in classes (Date, RegExp, Map, Set, Promise) and custom class
* instances that may contain private fields or internal slots.
* @param {any} value - The value to check.
* @returns {boolean} True if the value should be reactive, false otherwise.
*/
export function isReactiveTarget(value) {
if (value === null || typeof value !== 'object') {
return false;
}
if (value[NON_REACTIVE_SYMBOL]) {
return false;
}
const proto = Object.getPrototypeOf(value);
return (
proto === null ||
proto === Object.prototype ||
proto === Array.prototype ||
value instanceof Set ||
value instanceof Map
);
}
/**
* Returns the underlying raw object for a reactive proxy.
* @param {any} target
* @returns {any}
*/
export function toRaw(target) {
if (target === null || typeof target !== 'object') {
return target;
}
return target[RAW_SYMBOL] || target;
}
/**
* Returns true when value is an Avenx reactive proxy.
* @param {any} value
* @returns {boolean}
*/
export function isReactive(value) {
return !!(value && typeof value === 'object' && value[IS_REACTIVE_PROXY]);
}
/**
* Marks an object so it will not be wrapped by reactive proxies.
* @template T
* @param {T} target
* @returns {T}
*/
export function markRaw(target) {
if (target === null || typeof target !== 'object') {
return target;
}
if (!Object.isExtensible(target)) {
return target;
}
if (!target[NON_REACTIVE_SYMBOL]) {
Object.defineProperty(target, NON_REACTIVE_SYMBOL, {
value: true,
writable: false,
enumerable: false,
configurable: false,
});
}
return target;
}
/**
* Recursively cleans up parentMap entries for a detached reactive target and its nested properties.
* @param {any} value
* @param {Set<any>} [seen]
*/
export function cleanupParentMap(value, seen = new Set()) {
if (value === null || typeof value !== 'object') {
return;
}
const rawValue = value[RAW_SYMBOL] || value;
if (seen.has(rawValue)) {
return;
}
seen.add(rawValue);
if (parentMap.has(rawValue)) {
parentMap.delete(rawValue);
}
if (rawValue instanceof Map) {
for (const val of rawValue.values()) {
cleanupParentMap(val, seen);
}
} else if (rawValue instanceof Set) {
for (const val of rawValue.values()) {
cleanupParentMap(val, seen);
}
} else if (Array.isArray(rawValue)) {
for (let i = 0; i < rawValue.length; i++) {
cleanupParentMap(rawValue[i], seen);
}
} else {
// Plain object
for (const val of Object.values(rawValue)) {
cleanupParentMap(val, seen);
}
}
}
/**
* Whether anything depends on a key, or on the path that reaches it.
*
* A dependency may be recorded at any level: a template reading `cart.items`
* registers against `items` on the root target, while a write to
* `cart.items[0].qty` lands on the element object. Walking up `parentMap` is
* what connects the two.
* @param {object} target - The raw target that changed.
* @param {string|symbol|Array<string|symbol>} key - The key or keys that changed.
* @returns {boolean} True when some watcher depends on the change.
*/
function hasDependentOnPath(target, key) {
const keys = Array.isArray(key) ? key : [key];
const keysMap = depMap.get(target);
if (keysMap) {
for (const k of keys) {
const watchers = keysMap.get(k);
if (watchers && watchers.size > 0) {
return true;
}
}
}
// Walk to the root, asking whether the property that reaches this object is
// itself observed. A guard on depth is unnecessary: cleanupParentMap keeps
// the chain acyclic, but a visited set costs nothing and makes that explicit.
const seen = new Set();
let current = target;
while (current && !seen.has(current)) {
seen.add(current);
const relation = parentMap.get(current);
if (!relation) {
return false;
}
const parentKeys = depMap.get(relation.parentTarget);
if (parentKeys) {
const watchers = parentKeys.get(relation.parentKey);
if (watchers && watchers.size > 0) {
return true;
}
}
current = relation.parentTarget;
}
return false;
}
/**
* Factory for creating and managing Proxy handlers for reactive state objects.
*/
export class ProxyHandlerFactory {
/**
* @param {object} [options] - Configuration options.
* @param {string[]} [options.computedKeys] - List of keys that should be treated as computed properties.
* @param {Function} [options.onChange] - Callback triggered when a property is set.
* @param {Function|null} [options.onKeysChanged] - Callback triggered when the
* root target gains or loses a key, for consumers that cache its key set.
* @param {boolean|function(): boolean} [options.onlyNotifyObserved] - When true, onChange is
* suppressed for writes that no watcher depends on, at any level of the
* property path. Off by default so the standalone reactive primitive keeps
* notifying for every mutation.
* @param {Function} [options.getComputedValue] - Function to evaluate a computed property.
* @param {object} [options.instance] - The component instance for fallback property lookups.
* @param {boolean} [options.bypassSymbol] - Bypasses Symbol check during lookup.
* @param {string[]} [options.persist] - List of state keys to persist in localStorage.
*/
constructor({
computedKeys = [],
onChange = () => {},
onKeysChanged = null,
onlyNotifyObserved = false,
getComputedValue = () => undefined,
instance = null,
bypassSymbol = false,
persist = [],
} = {}) {
/** @type {Set<string>} */
this.computedKeys = new Set(computedKeys);
/** @type {Function} */
this.onChange = onChange;
/**
* Called when the root target gains or loses a key.
*
* Distinct from `onChange`, which fires for a *value* change. A consumer
* that caches the set of names state binds -- the template scope does --
* needs to know when that set changed, and cannot tell from a value
* notification. Without it the cache has to be rebuilt on every read, which
* is `Object.keys()` over the whole state object per expression evaluated.
* @type {Function|null}
*/
this.onKeysChanged = onKeysChanged;
/**
* Whether onChange is suppressed for writes nothing depends on.
*
* Off by default: the standalone reactive primitive promises a
* notification for every mutation. Components turn it on so that a write
* to a key no expression reads does not schedule a render.
* May be a predicate, so a consumer can enable filtering only once it has
* actually collected dependencies.
* @type {boolean|function(): boolean}
*/
this.onlyNotifyObserved = onlyNotifyObserved;
/** @type {Function} */
this.getComputedValueReal = getComputedValue;
/** @type {Set<string>} */
this.persistKeys = new Set(persist);
/** @type {WeakMap<object, Proxy>} */
this.proxyCache = new WeakMap();
/** @type {Map<string, AvenxWatcher>} */
this.computedWatchers = new Map();
/** @type {object|null} */
this.instance = instance;
/** @type {boolean} */
this.bypassSymbol =
bypassSymbol ||
(typeof globalThis !== 'undefined' &&
!!globalThis.__avenx_bypass_symbol__);
/** @type {object|null} */
this.rootTarget = null;
}
/**
* Evaluates and caches a computed property using an internal AvenxWatcher.
* @param {string} key - The computed key.
* @param {object} receiver - The proxy receiver.
* @returns {any}
*/
evaluateComputedWatcher(key, receiver) {
const target = receiver[RAW_SYMBOL] || receiver;
track(target, key);
let watcher = this.computedWatchers.get(key);
if (!watcher) {
watcher = new AvenxWatcher(
() => this.getComputedValueReal(key, receiver),
() => {
trigger(target, key);
this.notifyChange(target, key);
},
{ lazy: true },
);
this.computedWatchers.set(key, watcher);
}
return watcher.evaluate();
}
/**
* Cleans up all computed watchers created by this proxy handler.
*/
teardown() {
for (const watcher of this.computedWatchers.values()) {
watcher.teardown();
}
this.computedWatchers.clear();
}
/**
* Checks if the target object is still connected to the root state.
* @param {object} target - The target raw object.
* @returns {boolean}
*/
isConnected(target) {
if (!this.rootTarget) {
return true;
}
let current = target;
while (current) {
if (current === this.rootTarget) {
return true;
}
const relation = parentMap.get(current);
if (!relation) {
break;
}
current = relation.parentTarget;
}
return false;
}
/**
* Notifies about a change if anything actually depends on it.
*
* This used to call `onChange()` for every write to any connected target,
* which scheduled a component update whether or not a single expression read
* the key. The per-key dependency graph the Proxy layer maintains was
* therefore discarded at the last step: a component re-rendered in full when
* a state key nothing referenced changed.
*
* `trigger()` alone is not a sufficient replacement. It wakes watchers
* registered for exactly one target and key, and a nested write such as
* `items[0].qty = 3` triggers on the inner object while the template's
* dependency was recorded against `items` on the root. Walking the parent
* chain is what keeps deep reactivity working while still allowing a write
* that nothing observes -- at any level of the path -- to be skipped.
*
* Filtering is opt-in via `onlyNotifyObserved`. `StateFactory.create(obj,
* { onChange })` is a public primitive whose documented contract is that
* onChange fires for every mutation, watchers or not; components opt in
* because for them onChange means "schedule a re-render", and a re-render
* for a key no expression reads is exactly the waste being removed.
* @param {object} target - The target raw object.
* @param {string|symbol|Array<string|symbol>} [key] - The key that changed.
* Omitted for structural changes whose affected keys are not known, which
* notify unconditionally.
*/
notifyChange(target, key) {
if (!this.isConnected(target)) {
return;
}
// The filter is only sound once the consumer has collected dependencies.
// Before a component's first render nothing has been read, so every key
// would look unobserved and no update would ever be scheduled.
const filtering =
typeof this.onlyNotifyObserved === 'function' ? this.onlyNotifyObserved() : this.onlyNotifyObserved;
if (filtering && key !== undefined && !hasDependentOnPath(target, key)) {
return;
}
this.onChange();
}
/**
* Returns a custom implementation of a Map method.
* @param {Map} target - The raw Map.
* @param {string|symbol} key - The property/method key.
* @param {Proxy} receiver - The Map proxy.
* @returns {any}
*/
getMapMethod(target, key, receiver) {
if (key === 'size') {
track(target, 'size');
return target.size;
}
if (key === 'get') {
return (k) => {
track(target, k);
const val = target.get(k);
if (isReactiveTarget(val)) {
parentMap.set(val, { parentTarget: target, parentKey: k });
return this.getOrCreateProxy(val);
}
return val;
};
}
if (key === 'has') {
return (k) => {
track(target, k);
return target.has(k);
};
}
if (key === 'set') {
return (k, v) => {
const rawVal = v && v[RAW_SYMBOL] ? v[RAW_SYMBOL] : v;
if (journal.active) {
journal.recordCollection(target, this, 'Map');
}
const hasKey = target.has(k);
const oldValue = target.get(k);
const valueChanged = oldValue !== rawVal;
target.set(k, rawVal);
if (isReactiveTarget(oldValue)) {
cleanupParentMap(oldValue);
}
if (isReactiveTarget(rawVal)) {
parentMap.set(rawVal, { parentTarget: target, parentKey: k });
}
if (valueChanged || !hasKey) {
const token = tracer.on ? traceCollectionWrite(target, k, 'map.set', target.size) : -1;
try {
trigger(target, !hasKey ? [k, 'size'] : k);
this.notifyChange(target, !hasKey ? [k, 'size'] : k);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
return receiver;
};
}
if (key === 'delete') {
return (k) => {
if (journal.active) {
journal.recordCollection(target, this, 'Map');
}
const hasKey = target.has(k);
const oldValue = target.get(k);
const result = target.delete(k);
if (hasKey) {
if (isReactiveTarget(oldValue)) {
cleanupParentMap(oldValue);
}
const token = tracer.on ? traceCollectionWrite(target, k, 'map.delete', target.size) : -1;
try {
trigger(target, [k, 'size']);
this.notifyChange(target, [k, 'size']);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
return result;
};
}
if (key === 'clear') {
return () => {
if (journal.active) {
journal.recordCollection(target, this, 'Map');
}
const size = target.size;
if (size > 0) {
const keysMap = depMap.get(target);
const keysToTrigger = ['size'];
if (keysMap) {
keysToTrigger.push(...keysMap.keys());
}
target.clear();
const token = tracer.on ? traceCollectionWrite(target, undefined, 'clear', 0) : -1;
try {
trigger(target, keysToTrigger);
this.notifyChange(target, keysToTrigger);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
};
}
if (key === 'forEach') {
return (callback, thisArg) => {
track(target, 'size');
target.forEach((val, k) => {
callback.call(
thisArg,
isReactiveTarget(val) ? this.getOrCreateProxy(val) : val,
isReactiveTarget(k) ? this.getOrCreateProxy(k) : k,
receiver,
);
});
};
}
if (key === 'keys') {
return () => {
track(target, 'size');
const iterator = target.keys();
const self = this;
return {
next() {
const { value, done } = iterator.next();
return {
value: done ? undefined : isReactiveTarget(value) ? self.getOrCreateProxy(value) : value,
done,
};
},
[Symbol.iterator]() {
return this;
},
};
};
}
if (key === 'values') {
return () => {
track(target, 'size');
const iterator = target.values();
const self = this;
return {
next() {
const { value, done } = iterator.next();
return {
value: done ? undefined : isReactiveTarget(value) ? self.getOrCreateProxy(value) : value,
done,
};
},
[Symbol.iterator]() {
return this;
},
};
};
}
if (key === 'entries' || key === Symbol.iterator) {
return () => {
track(target, 'size');
const iterator = target.entries();
const self = this;
return {
next() {
const { value, done } = iterator.next();
let unwrapped;
if (done) {
unwrapped = undefined;
} else {
unwrapped = [
isReactiveTarget(value[0]) ? self.getOrCreateProxy(value[0]) : value[0],
isReactiveTarget(value[1]) ? self.getOrCreateProxy(value[1]) : value[1],
];
}
return {
value: unwrapped,
done,
};
},
[Symbol.iterator]() {
return this;
},
};
};
}
const value = Reflect.get(target, key, target);
if (typeof value === 'function') {
return value.bind(target);
}
return value;
}
/**
* Returns a custom implementation of a Set method.
* @param {Set} target - The raw Set.
* @param {string|symbol} key - The property/method key.
* @param {Proxy} receiver - The Set proxy.
* @returns {any}
*/
getSetMethod(target, key, receiver) {
if (key === 'size') {
track(target, 'size');
return target.size;
}
if (key === 'has') {
return (val) => {
const rawVal = val && val[RAW_SYMBOL] ? val[RAW_SYMBOL] : val;
track(target, rawVal);
return target.has(rawVal);
};
}
if (key === 'add') {
return (val) => {
if (journal.active) {
journal.recordCollection(target, this, 'Set');
}
const rawVal = val && val[RAW_SYMBOL] ? val[RAW_SYMBOL] : val;
const hasVal = target.has(rawVal);
if (!hasVal) {
target.add(rawVal);
if (isReactiveTarget(rawVal)) {
parentMap.set(rawVal, { parentTarget: target, parentKey: rawVal });
}
const token = tracer.on ? traceCollectionWrite(target, undefined, 'set.add', target.size) : -1;
try {
trigger(target, [rawVal, 'size']);
this.notifyChange(target, [rawVal, 'size']);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
return receiver;
};
}
if (key === 'delete') {
return (val) => {
if (journal.active) {
journal.recordCollection(target, this, 'Set');
}
const rawVal = val && val[RAW_SYMBOL] ? val[RAW_SYMBOL] : val;
const hasVal = target.has(rawVal);
const result = target.delete(rawVal);
if (hasVal) {
if (isReactiveTarget(rawVal)) {
cleanupParentMap(rawVal);
}
const token = tracer.on ? traceCollectionWrite(target, undefined, 'set.delete', target.size) : -1;
try {
trigger(target, [rawVal, 'size']);
this.notifyChange(target, [rawVal, 'size']);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
return result;
};
}
if (key === 'clear') {
return () => {
if (journal.active) {
journal.recordCollection(target, this, 'Set');
}
const size = target.size;
if (size > 0) {
const keysMap = depMap.get(target);
const keysToTrigger = ['size'];
if (keysMap) {
keysToTrigger.push(...keysMap.keys());
}
target.clear();
const token = tracer.on ? traceCollectionWrite(target, undefined, 'clear', 0) : -1;
try {
trigger(target, keysToTrigger);
this.notifyChange(target, keysToTrigger);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
};
}
if (key === 'forEach') {
return (callback, thisArg) => {
track(target, 'size');
target.forEach((val) => {
if (isReactiveTarget(val)) {
parentMap.set(val, { parentTarget: target, parentKey: val });
}
callback.call(
thisArg,
isReactiveTarget(val) ? this.getOrCreateProxy(val) : val,
isReactiveTarget(val) ? this.getOrCreateProxy(val) : val,
receiver,
);
});
};
}
if (key === 'values' || key === 'keys' || key === Symbol.iterator) {
return () => {
track(target, 'size');
const iterator = target.values();
const self = this;
return {
next() {
const { value, done } = iterator.next();
if (!done && isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: value });
}
return {
value: done ? undefined : isReactiveTarget(value) ? self.getOrCreateProxy(value) : value,
done,
};
},
[Symbol.iterator]() {
return this;
},
};
};
}
if (key === 'entries') {
return () => {
track(target, 'size');
const iterator = target.entries();
const self = this;
return {
next() {
const { value, done } = iterator.next();
let unwrapped;
if (done) {
unwrapped = undefined;
} else {
if (isReactiveTarget(value[0])) {
parentMap.set(value[0], { parentTarget: target, parentKey: value[0] });
}
unwrapped = [
isReactiveTarget(value[0]) ? self.getOrCreateProxy(value[0]) : value[0],
isReactiveTarget(value[1]) ? self.getOrCreateProxy(value[1]) : value[1],
];
}
return {
value: unwrapped,
done,
};
},
[Symbol.iterator]() {
return this;
},
};
};
}
const value = Reflect.get(target, key, target);
if (typeof value === 'function') {
return value.bind(target);
}
return value;
}
/**
* Creates the proxy handler object.
* @returns {ProxyHandler<object>}
*/
/**
* Creates the proxy handler object.
* @returns {ProxyHandler<object>}
*/
create() {
if (!this._sharedHandler) {
this._sharedHandler = {
set: (target, key, value) => {
if (!this.rootTarget) {
this.rootTarget = target;
}
return this.set(target, key, value);
},
get: (target, key, receiver) => {
if (!this.rootTarget) {
this.rootTarget = target;
}
return this.get(target, key, receiver);
},
ownKeys: (target) => {
if (!this.rootTarget) {
this.rootTarget = target;
}
return this.ownKeys(target);
},
getOwnPropertyDescriptor: (target, key) => {
if (!this.rootTarget) {
this.rootTarget = target;
}
return this.getOwnPropertyDescriptor(target, key);
},
deleteProperty: (target, key) => {
if (!this.rootTarget) {
this.rootTarget = target;
}
return this.deleteProperty(target, key);
},
};
}
return this._sharedHandler;
}
/**
* Proxy 'set' trap.
* @param {object} target - The target object.
* @param {string|symbol} key - The property key.
* @param {any} value - The new value.
* @returns {boolean}
*/
set(target, key, value) {
if (value && value[RAW_SYMBOL]) {
value = value[RAW_SYMBOL];
}
const isNewRootKey =
this.onKeysChanged !== null &&
target === this.rootTarget &&
typeof key !== 'symbol' &&
!Object.prototype.hasOwnProperty.call(target, key);
const oldValue = target[key];
const changed =
typeof key !== 'symbol' &&
(oldValue !== value || (Array.isArray(target) && key === 'length'));
// Journaled before the assignment, because whether the key already existed
// is the difference between restoring a value and deleting one, and that
// cannot be told apart once the write has landed.
if (changed && journal.active) {
if (Array.isArray(target) && key === 'length') {
// `arr.length = 0` discards elements that no single before/after pair
// describes, so the whole array is saved instead.
journal.recordCollection(target, this, 'array');
} else {
journal.recordWrite(
target,
key,
oldValue,
value,
Object.prototype.hasOwnProperty.call(target, key),
this
);
}
}
if (isReactiveTarget(oldValue)) {
cleanupParentMap(oldValue);
}
target[key] = value;
if (isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: key });
}
// Persist configured root-level state values to localStorage.
if (
changed &&
typeof key !== 'symbol' &&
target === this.rootTarget &&
this.persistKeys.has(key) &&
typeof localStorage !== 'undefined'
) {
try {
localStorage.setItem(key, JSON.stringify(value));
} catch {
// Ignore storage and serialization errors so persistence
// never breaks normal reactive state updates.
}
}
if (isNewRootKey) {
this.onKeysChanged();
}
if (changed) {
const token = tracer.on ? traceWrite(target, key, oldValue, value) : -1;
try {
trigger(target, key, oldValue, value);
this.notifyChange(target, key);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
return true;
}
/**
* Proxy 'get' trap.
* Redirects to evaluateComputedWatcher if the key is a computed property.
* @param {object} target - The target object.
* @param {string|symbol} key - The property key.
* @param {object} receiver - The proxy or object inheriting from the proxy.
* @returns {any}
*/
get(target, key, receiver) {
if (key === IS_REACTIVE_PROXY) {
return true;
}
if (key === RAW_SYMBOL) {
return target;
}
if (key === PROXY_REF_SYMBOL) {
return target[PROXY_REF_SYMBOL];
}
if (this.computedKeys.has(key)) {
return this.evaluateComputedWatcher(key, receiver);
}
if (target instanceof Map) {
return this.getMapMethod(target, key, receiver);
}
if (target instanceof Set) {
return this.getSetMethod(target, key, receiver);
}
if (!(key in target) && this.instance && key in this.instance) {
const val = this.instance[key];
if (typeof val === 'function') {
return val.bind(this.instance);
}
return val;
}
// Track property access
if (typeof key !== 'symbol') {
track(target, key);
}
const value = Reflect.get(target, key, receiver);
if (typeof value === 'function') {
if (Array.isArray(target) && mutatingArrayMethods.has(key)) {
return (...args) => {
// `push`, `splice` and `sort` have no single before-and-after pair to
// journal, so the transaction keeps a copy of the array instead —
// once, the first time it touches it.
if (journal.active) {
journal.recordCollection(target, this, `array.${String(key)}`);
}
const result = target[key](...args);
// The array's contents are deliberately not captured here: cloning
// the whole array on every push would make tracing a growing list
// quadratic. The length after the call is enough to explain it.
const token = tracer.on ? traceCollectionWrite(target, 'length', key, target.length) : -1;
try {
trigger(target, 'length');
this.notifyChange(target, 'length');
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
return result;
};
}
return value.bind(receiver);
}
if (isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: key });
if (!this.bypassSymbol && value[PROXY_REF_SYMBOL]) {
return value[PROXY_REF_SYMBOL];
}
return this.getOrCreateProxy(value);
}
return value;
}
/**
* Proxy 'deleteProperty' trap.
* @param {object} target - The target object.
* @param {string|symbol} key - The property key.
* @returns {boolean}
*/
deleteProperty(target, key) {
const hasKey = Reflect.has(target, key);
const oldValue = target[key];
if (hasKey && typeof key !== 'symbol' && journal.active) {
journal.recordDelete(target, key, oldValue, Object.prototype.hasOwnProperty.call(target, key), this);
}
const result = Reflect.deleteProperty(target, key);
if (isReactiveTarget(oldValue)) {
cleanupParentMap(oldValue);
}
if (hasKey) {
if (this.onKeysChanged !== null && target === this.rootTarget && typeof key !== 'symbol') {
this.onKeysChanged();
}
const token = tracer.on ? traceWrite(target, key, oldValue, undefined, 'delete') : -1;
try {
trigger(target, key);
this.notifyChange(target, key);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
}
return result;
}
/**
* Proxy 'ownKeys' trap.
* Includes computed keys in the list of keys.
* @param {object} target - The target object.
* @returns {Array<string|symbol>}
*/
ownKeys(target) {
return [...Reflect.ownKeys(target), ...this.computedKeys];
}
/**
* Proxy 'getOwnPropertyDescriptor' trap.
* Ensures computed properties appear as own properties.
* @param {object} target - The target object.
* @param {string|symbol} key - The property key.
* @returns {PropertyDescriptor|undefined}
*/
getOwnPropertyDescriptor(target, key) {
if (this.computedKeys.has(key)) {
return { enumerable: true, configurable: true };
}
return Reflect.getOwnPropertyDescriptor(target, key);
}
/**
* Returns a cached proxy or creates a new proxy for a nested object/array.
* @param {object | Array} val - The nested object or array.
* @returns {Proxy} The reactive proxy.
* @private
*/
getOrCreateProxy(val) {
if (!this.bypassSymbol && val[PROXY_REF_SYMBOL]) {
return val[PROXY_REF_SYMBOL];
}
if (val[IS_REACTIVE_PROXY]) {
return val;
}
if (this.proxyCache.has(val)) {
return this.proxyCache.get(val);
}
const proxy = new Proxy(val, this.create());
this.proxyCache.set(val, proxy);
if (!this.bypassSymbol && Object.isExtensible(val)) {
Object.defineProperty(val, PROXY_REF_SYMBOL, {
value: proxy,
writable: false,
enumerable: false,
configurable: false,
});
}
return proxy;
}
}
|