LocalStorage API powered by Indexeddb

local-storage-async.js

class LocalStorageAsync {
	static DatabaseKey = 'LocalStorageAsync.DatabaseKey'
	static DatabaseStoreKey = 'LocalStorageAsync.DatabaseStoreKey'
	#hasLoaded

	constructor() {
		this.#hasLoaded = new Promise((resolve, reject) => {
			let dRequest = indexedDB.deleteDatabase(LocalStorageAsync.DatabaseKey)

			dRequest.onerror = function() {
				reject(dRequest.error)
			}

			let request = indexedDB.open(LocalStorageAsync.DatabaseKey)
			request.onupgradeneeded = function() {
				request.result.createObjectStore(LocalStorageAsync.DatabaseStoreKey)
				resolve()
			}
			request.onerror = function() {
				reject(request.error)
			}
		})
	}

	async getItem(key) {
		await this.#hasLoaded
		return new Promise((resolve, reject) => {
			let oRequest = indexedDB.open(LocalStorageAsync.DatabaseKey)
			oRequest.onsuccess = function() {
				let db = oRequest.result
				let tx = db.transaction(LocalStorageAsync.DatabaseStoreKey, 'readonly')
				let st = tx.objectStore(LocalStorageAsync.DatabaseStoreKey)
				let gRequest = st.get(key)
				gRequest.onsuccess = function() {
					resolve(gRequest.result)
				}
				gRequest.onerror = function() {
					reject(gRequest.error)
				}
			}
			oRequest.onerror = function() {
				reject(oRequest.error)
			}
		})
	}

	async setItem(key, value) {
		await this.#hasLoaded
		return new Promise((resolve, reject) => {
			let oRequest = indexedDB.open(LocalStorageAsync.DatabaseKey)
			oRequest.onsuccess = function() {
				let db = oRequest.result
				let tx = db.transaction(LocalStorageAsync.DatabaseStoreKey, 'readwrite')
				let st = tx.objectStore(LocalStorageAsync.DatabaseStoreKey)
				let sRequest = st.put(value, key)
				sRequest.onsuccess = function() {
					resolve()
				}
				sRequest.onerror = function() {
					reject(sRequest.error)
				}
			}
			oRequest.onerror = function() {
				reject(oRequest.error)
			}
		})
	}

	async removeItem(key) {
		await this.#hasLoaded
		return new Promise((resolve, reject) => {
			let oRequest = indexedDB.open(LocalStorageAsync.DatabaseKey)
			oRequest.onsuccess = function() {
				let db = oRequest.result
				let tx = db.transaction(LocalStorageAsync.DatabaseStoreKey, 'readwrite')
				let st = tx.objectStore(LocalStorageAsync.DatabaseStoreKey)
				let rRequest = st.delete(key)
				rRequest.onsuccess = function() {
					resolve()
				}
				rRequest.onerror = function() {
					reject(rRequest.error)
				}
			}
			oRequest.onerror = function() {
				reject(oRequest.error)
			}
		})
	}
}