mutable-store/index.js

a mutable state management library for javascript

"use strict";
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Store = void 0;
exports.getProps = getProps;
exports.default = createMutableStore;
function getProps(obj) {
    var e_1, _a;
    var props = new Set();
    var builtins = [
        Object.prototype,
        Array.prototype,
        Function.prototype,
        String.prototype,
        Number.prototype,
        Boolean.prototype,
        Symbol.prototype,
        Date.prototype,
        RegExp.prototype,
        Map.prototype,
        Set.prototype,
        WeakMap.prototype,
        WeakSet.prototype,
        Promise.prototype,
        Error.prototype,
    ];
    while (obj && !builtins.includes(obj)) {
        try {
            for (var _b = (e_1 = void 0, __values(Reflect.ownKeys(obj))), _c = _b.next(); !_c.done; _c = _b.next()) {
                var key = _c.value;
                if (key !== "constructor") {
                    props.add(key);
                }
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_1) throw e_1.error; }
        }
        obj = Object.getPrototypeOf(obj);
    }
    return Array.from(props);
}
function makePropsReadOnly(obj, keys) {
    var e_2, _a;
    try {
        for (var keys_1 = __values(keys), keys_1_1 = keys_1.next(); !keys_1_1.done; keys_1_1 = keys_1.next()) {
            var key = keys_1_1.value;
            if (Object.prototype.hasOwnProperty.call(obj, key)) {
                Object.defineProperty(obj, key, {
                    writable: false,
                    configurable: false,
                    enumerable: true
                });
            }
            else {
                if (process.env.NODE_ENV !== 'production') {
                    // eslint-disable-next-line no-console
                    console.warn("Property \"".concat(String(key), "\" does not exist on the object."));
                }
            }
        }
    }
    catch (e_2_1) { e_2 = { error: e_2_1 }; }
    finally {
        try {
            if (keys_1_1 && !keys_1_1.done && (_a = keys_1.return)) _a.call(keys_1);
        }
        finally { if (e_2) throw e_2.error; }
    }
    return obj;
}
function createMutableStore(mutableState) {
    if (mutableState === null || typeof mutableState !== "object") {
        throw Error("mutableState must be an object");
    }
    var props = getProps(mutableState);
    if (props.includes("subscribe")) {
        throw Error("subscribe is a reserved keyword for the store, please use another name for your property");
    }
    var subscriptions = new Set();
    var internalStoreUnSubs = new Set();
    var getInternalStores = function () {
        return props
            .filter(function (item) { return mutableState[item].___thisIsAMutableStore___; })
            .map(function (item) { return mutableState[item]; });
    };
    mutableState.___thisIsAMutableStore___ = true;
    mutableState.___version___ = 1;
    var subscribe = function (fn) {
        subscriptions.add(fn);
        return function () {
            subscriptions.delete(fn);
        };
    };
    mutableState.subscribe = subscribe;
    function callSubs() {
        try {
            subscriptions.forEach(function (fn) { return fn(); });
        }
        catch (e) {
            if (process.env.NODE_ENV !== 'production') {
                // eslint-disable-next-line no-console
                console.error(e);
            }
        }
    }
    // auto subscribe to internal stores
    function autoSubscribeToInternalStores() {
        getInternalStores().forEach(function (item) {
            return internalStoreUnSubs.add(item.subscribe(function () {
                callSubs();
            }));
        });
    }
    autoSubscribeToInternalStores();
    props.forEach(function (prop) {
        if (typeof mutableState[prop] === "function" &&
            prop.toString().startsWith("set_")) {
            var originalMethod_1 = mutableState[prop];
            mutableState[prop] = function () {
                var args = [];
                for (var _i = 0; _i < arguments.length; _i++) {
                    args[_i] = arguments[_i];
                }
                var result = originalMethod_1.apply(mutableState, args);
                setTimeout(function () {
                    callSubs();
                    autoSubscribeToInternalStores();
                }, 0);
                return result;
            };
        }
    });
    Object.preventExtensions(mutableState);
    makePropsReadOnly(mutableState, props.filter(function (item) {
        var _a;
        return typeof mutableState[item] === "function" ||
            ((_a = mutableState[item]) === null || _a === void 0 ? void 0 : _a.___thisIsAMutableStore___);
    }));
    return mutableState;
}
exports.Store = createMutableStore;