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index.cjs.js
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index.cjs.js
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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var immer = require('immer');
var withSelector = require('use-sync-external-store/shim/with-selector');
/**
*
* @see https://github.com/facebook/react/blob/64acd3918a26d92773d3dd451a735603ef50d3a7/packages/shared/shallowEqual.js#L18
* @see https://github.com/dashed/shallowequal/blob/master/index.js
*/
var hasOwnProperty = Object.prototype.hasOwnProperty;
function shallowEqual(a, b) {
if (Object.is(a, b)) {
return true;
}
if (typeof a !== 'object' || !a || typeof b !== 'object' || !b) {
return false;
}
var keysA = Object.keys(a);
var keysB = Object.keys(b);
if (keysA.length !== keysB.length) {
return false;
}
var bHasOwnProperty = hasOwnProperty.bind(b);
for (var idx = 0; idx < keysA.length; idx++) {
var key = keysA[idx];
if (!bHasOwnProperty(key) || !Object.is(a[key], b[key])) {
return false;
}
}
return true;
}
function arrayShallowEqual(a, b) {
if (a.length !== b.length) {
return false;
}
for (var idx = 0; idx < a.length; idx++) {
if (!shallowEqual(a[idx], b[idx])) {
return false;
}
}
return true;
}
var PromiseResolve = Promise.resolve;
function createImmerExternalStore(initialState) {
var STATE = {};
var listeners = new Set();
var getters = new Map();
function notify(nextState) {
STATE = nextState;
new Set(listeners).forEach(function (sub) {
return sub();
});
}
function subscribe(listener) {
listeners.add(listener);
return function () {
return listeners["delete"](listener);
};
}
function dispatch(recipeOrPartial) {
var draft = immer.createDraft(STATE);
if (typeof recipeOrPartial === 'function') {
return PromiseResolve(recipeOrPartial(draft)).then(function () {
return notify(immer.finishDraft(draft));
});
}
notify(immer.finishDraft(Object.assign(draft, recipeOrPartial)));
}
function refresh(init) {
init = init || initialState;
if (typeof init === 'function') {
return PromiseResolve(init()).then(notify);
}
notify(init);
}
function selectorImpl(selectors) {
if (!selectors || !selectors.length) return [STATE];
return selectors.map(function (sel) {
var picker = sel; // as function selector
if (typeof sel === 'string') {
picker = getters.get(sel);
if (!picker) {
picker = new Function('o', "return o[\"".concat(sel.split('.').join('"]["'), "\"];"));
getters.set(sel, picker);
}
}
try {
return picker(STATE);
} catch (error) {
return undefined;
}
});
}
function getSnapshot() {
return STATE;
}
function useState() {
var args = arguments;
return withSelector.useSyncExternalStoreWithSelector(subscribe, getSnapshot, getSnapshot, function () {
return selectorImpl(Array.from(args));
}, arrayShallowEqual).concat(dispatch);
}
refresh(initialState); // immediately refresh
return {
useState: useState,
dispatch: dispatch,
subscribe: subscribe,
getSnapshot: getSnapshot,
refresh: refresh
};
}
exports.createImmerExternalStore = createImmerExternalStore;
exports.default = createImmerExternalStore;