Created
March 31, 2020 15:06
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Basic mock for "@react-native-community/async-storage-backend-legacy"
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import { EmptyStorageModel, IStorageBackend, StorageOptions } from "@react-native-community/async-storage"; | |
export default class MockAsyncStorage<T = EmptyStorageModel> implements IStorageBackend<T> { | |
private MOCK_STORAGE: T = {} as T; | |
public async getSingle<K extends keyof T>(key: K, opts?: StorageOptions): Promise<T[K] | null> { | |
const obj = await this.getMany<K>([key], opts); | |
return obj[key] ?? null; | |
} | |
public async setSingle<K extends keyof T>(key: K, value: T[K], opts?: StorageOptions): Promise<void> { | |
const obj = { [key]: value } as {[k in K]: T[k]}; | |
await this.setMany<K>([obj], opts); | |
} | |
public async getMany<K extends keyof T>(keys: Array<K>, _opts?: StorageOptions): Promise<{[k in K]: T[k] | null}> { | |
return keys.reduce( | |
(acc, key) => ({ ...acc, [key]: this.MOCK_STORAGE[key] ?? null }), | |
{} as {[k in K]: T[k] | null} | |
); | |
} | |
public async setMany<K extends keyof T>(values: Array<{[k in K]: T[k]}>, _opts?: StorageOptions): Promise<void> { | |
values.forEach(value => { | |
this.MOCK_STORAGE = { | |
...this.MOCK_STORAGE, | |
...value | |
}; | |
}); | |
} | |
public async removeSingle(key: keyof T, opts?: StorageOptions): Promise<void> { | |
await this.removeMany([key], opts); | |
} | |
public async removeMany(keys: Array<keyof T>, _opts?: StorageOptions): Promise<void> { | |
keys.forEach(key => { | |
if (this.MOCK_STORAGE[key]) { | |
delete this.MOCK_STORAGE[key]; | |
} | |
}); | |
} | |
public async getKeys(_opts?: StorageOptions): Promise<Array<keyof T>> { | |
return Object.keys(this.MOCK_STORAGE) as Array<keyof T>; | |
} | |
public async dropStorage(_opts?: StorageOptions): Promise<void> { | |
this.MOCK_STORAGE = {} as T; | |
} | |
} |
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