@antischematic/angular-state-library
Version:
Reactive state without boilerplate
84 lines • 10.6 kB
JavaScript
const cache = new WeakMap();
const proxies = new WeakMap();
let deps = [];
export function pushStack(value) {
deps.unshift(value);
}
export function popStack() {
deps.shift();
}
function isTracking() {
return deps.length > 0;
}
export const changesMap = new WeakMap();
export function getChanges(deps) {
const changes = changesMap.get(deps) ?? new Map();
changesMap.set(deps, changes);
return changes;
}
export function addDep(object, key, value, previous = value, update = false) {
if (isTracking()) {
let seen = false;
for (const dep of deps) {
const keyValues = dep.get(object) ?? new Map;
dep.set(object, keyValues);
if (!seen && update && !Object.is(value, previous)) {
seen = true;
const changes = getChanges(dep);
const change = changes.get(object) ?? new Map();
changes.set(object, change);
if (!change.has(key)) {
change.set(key, untrack(previous));
}
}
if (update && keyValues.has(key) || !update) {
keyValues.set(key, value);
}
}
}
}
function createObjectProxy(object) {
return new Proxy(object, {
get(target, p) {
const value = Reflect.get(target, p);
addDep(target, p, value);
return value;
},
set(target, p, value, receiver) {
const previous = Reflect.get(target, p);
const result = Reflect.set(target, p, value, receiver);
addDep(target, p, value, previous, true);
return result;
},
deleteProperty(target, p) {
const previous = Reflect.get(target, p);
const result = Reflect.deleteProperty(target, p);
addDep(target, p, void 0, previous, true);
return result;
}
});
}
export function createProxy(object) {
if (!isObject(object))
return object;
if (cache.has(object)) {
return cache.get(object);
}
const proxy = createObjectProxy(object);
cache.set(object, proxy);
proxies.set(proxy, object);
return proxy;
}
export function isTracked(object) {
return proxies.has(object);
}
function isObject(value) {
return typeof value === "object" && value !== null;
}
export function track(object) {
return isObject(object) && !isTracked(object) ? createProxy(object) : object;
}
export function untrack(object) {
return proxies.get(object) ?? object;
}
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createProxy(object as any) : object\n}\n\nexport function untrack<T>(object: T): T {\n   return proxies.get(object as any) ?? object\n}\n"]}