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mock-async-storage

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Its a mock of react-native AsyncStorage for jest tests

github.com/devmetal/mock-async-storage

devmetal/mock-async-storage

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{"version":3,"sources":["../src/index.ts","../src/mockAsyncStorage.ts"],"sourcesContent":["import MockAsyncStorage from './mockAsyncStorage'\n\nexport default MockAsyncStorage\n","import merge from \"deepmerge\";\n\nexport type Entry<K, V> = [K, V | null];\n\nexport type Entries<K, V> = Array<Entry<K, V>>;\n\nexport type ErrBack<V> = (err: Error | null, val?: V | null) => void;\n\nexport type ArrErrBack<V> = (err: Array<Error> | null, val?: V) => void;\n\nconst isStringified = (str: string): boolean => {\n try {\n JSON.parse(str);\n return true;\n } catch (e) {\n return false;\n }\n};\n\nclass AsyncDict<K, V> {\n store: Map<K, V | null>;\n\n size(): number {\n return this.store.size;\n }\n\n getStore(): Map<K, V | null> {\n return new Map(this.store);\n }\n\n constructor() {\n this.store = new Map();\n }\n\n async getItem(k: K, cb?: ErrBack<V>): Promise<V | null> {\n const val = this.store.get(k) || null;\n if (cb) cb(null, val);\n return val;\n }\n\n async setItem(k: K, v: V, cb?: ErrBack<V>): Promise<void> {\n this.store.set(k, v);\n if (cb) cb(null);\n }\n\n async removeItem(k: K, cb?: ErrBack<V>): Promise<void> {\n this.store.delete(k);\n if (cb) cb(null);\n }\n\n async clear(cb?: ErrBack<V>): Promise<void> {\n this.store.clear();\n if (cb) cb(null);\n }\n\n async getAllKeys(cb?: ErrBack<Array<K>>): Promise<Array<K>> {\n const keys: Array<K> = Array.from(this.store.keys());\n if (cb) cb(null, keys);\n return keys;\n }\n\n async multiGet(\n keys: Array<K>,\n cb?: ErrBack<Entries<K, V>>\n ): Promise<Entries<K, V>> {\n const requested: Entries<K, V> = keys.map((k) => [\n k,\n this.store.get(k) || null,\n ]);\n if (cb) cb(null, requested);\n return requested;\n }\n\n async multiSet(entries: Entries<K, V>, cb?: ErrBack<V>): Promise<void> {\n for (const [key, value] of entries) {\n this.store.set(key, value);\n }\n if (cb) cb(null);\n }\n\n async multiRemove(keys: Array<K>, cb?: ErrBack<V>): Promise<void> {\n for (const key of keys) {\n this.store.delete(key);\n }\n if (cb) cb(null);\n }\n}\n\nclass MockAsyncStorage extends AsyncDict<string, string> {\n async mergeItem(\n key: string,\n value: string,\n cb?: ErrBack<string>\n ): Promise<void> {\n const item: string | null = await this.getItem(key);\n\n if (!item) throw new Error(`No item with ${key} key`);\n if (!isStringified(item)) throw new Error(`Invalid item with ${key} key`);\n if (!isStringified(value))\n throw new Error(`Invalid value to merge with ${key}`);\n\n const itemObj: unknown = JSON.parse(item);\n const valueObj: unknown = JSON.parse(value);\n const merged: unknown = merge(itemObj, valueObj);\n\n await this.setItem(key, JSON.stringify(merged));\n\n if (cb) cb(null);\n }\n\n async multiMerge(\n entries: Entries<string, string>,\n cb?: ArrErrBack<string>\n ): Promise<void> {\n const errors: Array<Error> = [];\n\n for (const [key, value] of entries) {\n try {\n if (value) {\n await this.mergeItem(key, value);\n }\n } catch (err) {\n errors.push(err as Error);\n }\n }\n\n if (errors.length) {\n if (cb) cb(errors);\n return Promise.reject(errors);\n }\n\n if (cb) cb(null);\n return Promise.resolve();\n }\n\n flushGetRequests() {}\n}\n\nexport default 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