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react-native-mmkv-storage

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This library aims to provide a fast & reliable solution for you data storage needs in react-native apps. It uses [MMKV](https://github.com/Tencent/MMKV) by Tencent under the hood on Android and iOS both that is used by their WeChat app(more than 1 Billion

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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) { function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); } return new (P || (P = Promise))(function (resolve, reject) { function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } } function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } } function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); } step((generator = generator.apply(thisArg, _arguments || [])).next()); }); }; var __generator = (this && this.__generator) || function (thisArg, body) { var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g; return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g; function verb(n) { return function (v) { return step([n, v]); }; } function step(op) { if (f) throw new TypeError("Generator is already executing."); while (g && (g = 0, op[0] && (_ = 0)), _) try { if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t; if (y = 0, t) op = [op[0] & 2, t.value]; switch (op[0]) { case 0: case 1: t = op; break; case 4: _.label++; return { value: op[1], done: false }; case 5: _.label++; y = op[1]; op = [0]; continue; case 7: op = _.ops.pop(); _.trys.pop(); continue; default: if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; } if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; } if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; } if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; } if (t[2]) _.ops.pop(); _.trys.pop(); continue; } op = body.call(thisArg, _); } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; } if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true }; } }; import { useCallback, useEffect, useRef, useState } from 'react'; import { methods } from './constants'; import { getDataType, getInitialValue } from './functions'; /** * A helper function which returns `useMMKVStorage` hook with a storage instance set. * * ```tsx * import MMKVStorage, {create} from "react-native-mmkv-storage" * * const storage = new MMKVStorage.Loader().initialize(); * const useStorage = create(storage); * * // Then later in your component * const App = () => { * const [value, setValue] = useStorage("key"); * * ... * } * ``` * Documentation: https://rnmmkv.vercel.app/#/usemmkvstorage * * @param storage The storage instance * @returns `useMMKVStorage` hook */ export var create = function (storage) { return function (key, defaultValue, equalityFn) { if (!key || typeof key !== 'string' || !storage) throw new Error('Key and Storage are required parameters.'); return useMMKVStorage(key, storage, defaultValue, equalityFn); }; }; /** * * useMMKVStorage Hook is like a persisted state that will always write every change in storage and update your app UI instantly. * It doesn’t matter if you reload the app or restart it. Everything will be in place on app load. * * ```tsx * import MMKVStorage from "react-native-mmkv-storage" * * const MMKV = new MMKVStorage.Loader().initialize(); * * // Then later in your component * const App = () => { * const [user, setUser] = useMMKVStorage("user", MMKV, "robert"); * * ... * }; * ``` * Documentation: https://rnmmkv.vercel.app/#/usemmkvstorage * * @param key The key against which the hook should update * @param storage The storage instance * @param defaultValue Default value if any * @param equalityFn Provide a custom function to handle state update if value has changed. * * @returns `[value,setValue]` */ export var useMMKVStorage = function (key, storage, defaultValue, equalityFn) { var getValue = useCallback(getInitialValue(key, storage, 'value'), [key, storage]); var getValueType = useCallback(getInitialValue(key, storage, 'type'), [key, storage]); var _a = useState(getValue), value = _a[0], setValue = _a[1]; var _b = useState(getValueType), valueType = _b[0], setValueType = _b[1]; var prevKey = usePrevious(key); var prevStorage = usePrevious(storage); var prevValue = useRef(value); useEffect(function () { prevValue.current = value; if (storage.options.persistDefaults && defaultValue !== undefined && defaultValue !== null && (value === null || value === undefined)) { setNewValue(defaultValue); } }, [value]); useEffect(function () { if (storage !== null) { // This check prevents getInitialValue from being called twice when this hook intially loads if (prevKey !== key || prevStorage !== storage) { setValue(getValue); setValueType(getValueType); } storage.ev.subscribe("".concat(key, ":onwrite"), updateValue); } return function () { if (storage != null) { storage.ev.unsubscribe("".concat(key, ":onwrite"), updateValue); } }; }, [prevKey, key, prevStorage, storage, getValue, getValueType]); var updateValue = useCallback(function (event) { var type = getDataType(event.value); //@ts-ignore var _value = event.value ? methods[type]['copy'](event.value) : event.value; if (prevValue.current === _value || (equalityFn === null || equalityFn === void 0 ? void 0 : equalityFn(prevValue.current, _value))) return; setValue(_value); setValueType(type); }, []); var setNewValue = useCallback(function (nextValue) { return __awaiter(void 0, void 0, void 0, function () { var updatedValue, _value, _valueType, _dataType; return __generator(this, function (_a) { updatedValue = nextValue; if (typeof nextValue === 'function') { if (nextValue.constructor.name === 'AsyncFunction') { __DEV__ && console.warn("Attempting to use an async function as state setter is not allowed."); return [2 /*return*/]; } updatedValue = nextValue(prevValue.current || defaultValue); } _valueType = valueType; if (updatedValue === null || updatedValue === undefined) { storage.removeItem(key); _valueType = null; } else { _dataType = getDataType(updatedValue); if (_valueType && _dataType !== valueType) { __DEV__ && console.warn("Trying to set a ".concat(_dataType, " value to hook for type ").concat(_valueType, " is not allowed.")); return [2 /*return*/]; } if (!valueType) { _valueType = _dataType; } _value = updatedValue; //@ts-ignore storage[methods[_valueType]['set']](key, _value); } //@ts-ignore if (prevValue.current === _value || (equalityFn === null || equalityFn === void 0 ? void 0 : equalityFn(prevValue.current, _value))) return [2 /*return*/]; //@ts-ignore setValue(_value); setValueType(_valueType); return [2 /*return*/]; }); }); }, [key, storage, valueType]); return [ valueType === 'boolean' || valueType === 'number' ? value : value || defaultValue, setNewValue ]; }; function usePrevious(value) { var ref = useRef(value); useEffect(function () { ref.current = value; }, [value]); return ref.current; }