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* Factory for creating proxy handlers used in reactive state.
* Handles normal property access and computed property redirection.
*/
export const RAW_SYMBOL = Symbol('raw');
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;
}
const proto = Object.getPrototypeOf(value);
return proto === null || proto === Object.prototype || proto === Array.prototype;
}
// Global context for active computed evaluations
let activeComputedKey = null;
const evaluationStack = [];
// WeakMap tracking raw target to Map of keys to Set of activeComputedKeys depending on them
const depMap = new WeakMap();
// WeakMap tracking child target to { parentTarget, parentKey } relationship
const parentMap = new WeakMap();
function track(target, key) {
if (activeComputedKey) {
let keysMap = depMap.get(target);
if (!keysMap) {
keysMap = new Map();
depMap.set(target, keysMap);
}
let computedKeys = keysMap.get(key);
if (!computedKeys) {
computedKeys = new Set();
keysMap.set(key, computedKeys);
}
computedKeys.add(activeComputedKey);
}
}
function trigger(target, key, computedDirty) {
// 1. Trigger dependencies on the exact key
const keysMap = depMap.get(target);
if (keysMap) {
const computedKeys = keysMap.get(key);
if (computedKeys) {
for (const computedKey of computedKeys) {
if (!computedDirty.get(computedKey)) {
computedDirty.set(computedKey, true);
// Propagate to other computed properties depending on this one
trigger(target, computedKey, computedDirty);
}
}
}
}
// 2. Propagate invalidation to parents in case target is a nested object
const parentRelation = parentMap.get(target);
if (parentRelation) {
const { parentTarget, parentKey } = parentRelation;
trigger(parentTarget, parentKey, computedDirty);
}
}
export class ProxyHandlerFactory {
/**
* @param {Object} [options={}] - Configuration options.
* @param {string[]} [options.computedKeys=[]] - List of keys that should be treated as computed properties.
* @param {function(): void} [options.onChange=() => {}] - Callback triggered when a property is set.
* @param {function(string, Object): any} [options.getComputedValue=() => undefined] - Function to evaluate a computed property.
*/
constructor({
computedKeys = [],
onChange = () => {},
getComputedValue = () => undefined
} = {}) {
/** @type {Set<string>} @private */
this.computedKeys = new Set(computedKeys);
/** @type {function(): void} @private */
this.onChange = onChange;
/** @type {function(string, Object): any} @private */
this.getComputedValueReal = getComputedValue;
/** @type {WeakMap<Object, Proxy>} @private */
this.proxyCache = new WeakMap();
// Computed property caching maps
/** @type {Map<string, any>} @private */
this.computedCache = new Map();
/** @type {Map<string, boolean>} @private */
this.computedDirty = new Map();
// Mark all computed properties initially dirty
for (const key of computedKeys) {
this.computedDirty.set(key, true);
}
}
/**
* Internal helper to evaluate and cache a computed property.
* @param {string} key
* @param {Object} target
* @returns {any}
* @private
*/
evaluateComputedCached(key, receiver) {
const target = receiver[RAW_SYMBOL] || receiver;
// Track the computed property itself as a dependency of whatever outer computed is evaluating
track(target, key);
if (this.computedCache.has(key) && !this.computedDirty.get(key)) {
return this.computedCache.get(key);
}
// Push to active evaluation context stack
evaluationStack.push(activeComputedKey);
activeComputedKey = key;
try {
const val = this.getComputedValueReal(key, receiver);
this.computedCache.set(key, val);
this.computedDirty.set(key, false);
return val;
} finally {
activeComputedKey = evaluationStack.pop();
}
}
/**
* Creates the proxy handler object.
* @returns {ProxyHandler<Object>}
*/
create() {
return {
set: (target, key, value) => this.set(target, key, value),
get: (target, key, receiver) => this.get(target, key, receiver),
ownKeys: target => this.ownKeys(target),
getOwnPropertyDescriptor: (target, key) => this.getOwnPropertyDescriptor(target, key),
deleteProperty: (target, key) => this.deleteProperty(target, key)
};
}
/**
* 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 oldValue = target[key];
target[key] = value;
if (isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: key });
}
if (oldValue !== value || (Array.isArray(target) && key === 'length')) {
trigger(target, key, this.computedDirty);
this.onChange();
}
return true;
}
/**
* Proxy 'get' trap.
* Redirects to getComputedValue 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 === RAW_SYMBOL) {
return target;
}
if (this.computedKeys.has(key)) {
return this.evaluateComputedCached(key, receiver);
}
// 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) => {
const result = target[key](...args);
trigger(target, 'length', this.computedDirty);
this.onChange();
return result;
};
}
return value.bind(receiver);
}
if (isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: key });
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 result = Reflect.deleteProperty(target, key);
if (hasKey) {
trigger(target, key, this.computedDirty);
this.onChange();
}
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.proxyCache.has(val)) {
return this.proxyCache.get(val);
}
const handler = {
get: (target, key, receiver) => {
if (key === RAW_SYMBOL) {
return target;
}
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) => {
const result = target[key](...args);
trigger(target, 'length', this.computedDirty);
this.onChange();
return result;
};
}
return value.bind(receiver);
}
if (isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: key });
return this.getOrCreateProxy(value);
}
return value;
},
set: (target, key, value) => {
if (value && value[RAW_SYMBOL]) {
value = value[RAW_SYMBOL];
}
const oldValue = target[key];
target[key] = value;
if (isReactiveTarget(value)) {
parentMap.set(value, { parentTarget: target, parentKey: key });
}
if (oldValue !== value || (Array.isArray(target) && key === 'length')) {
trigger(target, key, this.computedDirty);
this.onChange();
}
return true;
},
deleteProperty: (target, key) => {
const hasKey = Reflect.has(target, key);
const result = Reflect.deleteProperty(target, key);
if (hasKey) {
trigger(target, key, this.computedDirty);
this.onChange();
}
return result;
}
};
const proxy = new Proxy(val, handler);
this.proxyCache.set(val, proxy);
return proxy;
}
}
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