reactive-localstorage
Version:
A reactive localStorage with no dependency
263 lines • 18.2 kB
JavaScript
import { version } from './env';
const $injectMark = Symbol.for('reactive-localstorage-inject-mark');
const $handlers = Symbol.for('reactive-localstorage-handlers');
export class LocalStorage {
constructor(window, storage) {
this._events = {};
this._length = 0;
this._injected = false;
// istanbul ignore next
if (window) {
this.supported = true;
}
else {
this.supported = false;
window = new Window();
}
this.native = storage || window.localStorage;
this._cache = new Map();
listen(window, ({ key, newValue, oldValue, storageArea }) => {
if (storageArea !== storage)
return;
this.feed(key, newValue, oldValue);
});
}
get version() {
return version;
}
get length() {
return this.native.length;
}
key(index) {
return this.native.key(index);
}
getItem(key) {
this.inject();
const cache = this._cache;
if (cache.has(key))
return cache.get(key);
const value = getNative('getItem').call(this.native, key);
cache.set(key, value);
return value;
}
setItem(key, value) {
return this.set(key, String(value));
}
removeItem(key) {
return this.set(key, null);
}
clear() {
getNative('clear').call(this.native);
const cache = this._cache;
for (const key of cache.keys()) {
cache.set(key, null);
}
this.emit('change', null, null, null);
}
on(name, fn) {
this.inject();
let set = this._events[name];
if (!set) {
this._events[name] = set = new Set();
}
set.add(fn);
}
off(name, fn) {
const set = this._events[name];
if (set) {
set.delete(fn);
}
}
feed(key, newValue, oldValue) {
if (typeof key === 'string') {
this._cache.set(key, newValue);
if (newValue !== oldValue) {
try {
this.emit('change', key, newValue, oldValue);
}
catch (e) {
// tslint:disable-next-line no-console
console.error(e);
}
}
}
else {
this._cache.clear();
try {
this.emit('change', key, newValue, oldValue);
}
catch (e) {
// tslint:disable-next-line no-console
console.error(e);
}
}
}
set(key, value) {
const cache = this._cache;
const oldValue = cache.has(key) ? cache.get(key) : getNative('getItem').call(this.native, key);
if (typeof value === 'string') {
getNative('setItem').call(this.native, key, value);
}
else {
getNative('removeItem').call(this.native, key);
}
cache.set(key, value);
this.emit('change', key, value, oldValue);
}
emit(name, ...args) {
const set = this._events[name];
if (set) {
for (const fn of set.values()) {
fn.apply(null, args);
}
}
}
inject() {
if (this._injected)
return;
this._injected = true;
const storage = this.native;
const me = this;
const cache = this._cache;
const handlers = storage[$handlers] || (storage[$handlers] = []);
handlers.push({
injector: this,
getItem(key, value) {
cache.set(key, value);
},
setItem(key, value) {
me.feed(key, value, me.getItem(key));
},
removeItem(key) {
me.feed(key, null, me.getItem(key));
},
clear() {
me.feed(null, null, null);
},
});
}
}
function listen(target, cb) {
if (target.addEventListener) {
target.addEventListener('storage', cb, true);
// istanbul ignore next
}
else if (target.attachEvent) {
target.attachEvent('storage', cb);
// istanbul ignore next
}
else {
return false;
}
return true;
}
inject();
function inject() {
// istanbul ignore next
if (Storage.prototype[$injectMark]) {
console.warn(`Storage has been injected, there might be multi versions of reactive-localstorage`);
return;
}
const { getItem: nativeGetItem, setItem: nativeSetItem, removeItem: nativeRemoveItem, clear: nativeClear, } = Storage.prototype;
function injectedGetItem(key) {
const value = nativeGetItem.call(this, key);
const handlers = this[$handlers];
if (handlers) {
for (const { getItem: fn, injector: { native } } of handlers) {
if (this !== native)
continue;
if (typeof fn === 'function') {
fn.call(this, key, value);
}
}
}
return value;
}
injectedGetItem.native = nativeGetItem;
function injectedSetItem(key, value) {
value = String(value);
const handlers = this[$handlers];
if (handlers) {
for (const { setItem: fn, injector: { native } } of handlers) {
if (this !== native)
continue;
if (typeof fn === 'function') {
fn.call(this, key, value);
}
}
}
return nativeSetItem.call(this, key, value);
}
injectedSetItem.native = nativeSetItem;
function injectedRemoveItem(key) {
const handlers = this[$handlers];
if (handlers) {
for (const { removeItem: fn, injector: { native } } of handlers) {
if (this !== native)
continue;
if (typeof fn === 'function') {
fn.call(this, key);
}
}
}
return nativeRemoveItem.call(this, key);
}
injectedRemoveItem.native = nativeRemoveItem;
function injectedClear() {
const handlers = this[$handlers];
if (handlers) {
for (const { clear: fn, injector: { native } } of handlers) {
if (this !== native)
continue;
if (typeof fn === 'function') {
fn.call(this);
}
}
}
return nativeClear.call(this);
}
injectedClear.native = nativeClear;
Object.defineProperties(Storage.prototype, {
[$injectMark]: {
configurable: true,
enumerable: false,
writable: true,
value: true,
},
[$handlers]: {
configurable: true,
enumerable: false,
writable: true,
value: [],
},
getItem: {
configurable: true,
enumerable: false,
writable: true,
value: injectedGetItem,
},
setItem: {
configurable: true,
enumerable: false,
writable: true,
value: injectedSetItem,
},
removeItem: {
configurable: true,
enumerable: false,
writable: true,
value: injectedRemoveItem,
},
clear: {
configurable: true,
enumerable: false,
writable: true,
value: injectedClear,
},
});
}
function getNative(key) {
const fn = Storage.prototype[key];
return fn && fn.native || fn;
}
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