18 lines
687 B
TypeScript
18 lines
687 B
TypeScript
// Copyright 2017-2019 @polkadot/react-hooks authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import store from 'store';
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import useApi from './useApi';
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// create a chain-specific key for the local cache
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export default function useCacheKey <T> (storageKeyBase: string): [(defaultValue?: T) => T | undefined, (value: T) => T] {
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const { api, isDevelopment } = useApi();
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const STORAGE_KEY = `${storageKeyBase}:${isDevelopment ? 'development' : api.genesisHash}`;
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return [
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(): T | undefined => store.get(STORAGE_KEY),
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(value: T): T => store.set(STORAGE_KEY, value)
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];
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}
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