27 lines
1.0 KiB
TypeScript
27 lines
1.0 KiB
TypeScript
// Copyright 2017-2020 @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 { useCallback, useMemo } from 'react';
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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 storageKey = useMemo(
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() => `${storageKeyBase}:${isDevelopment ? 'development' : api.genesisHash.toHex()}`,
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[api, isDevelopment, storageKeyBase]
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);
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// FIXME both these want "T"... incorrect
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// eslint-disable-next-line react-hooks/exhaustive-deps
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const getter = useCallback((): T | undefined => store.get(storageKey) as T, [storageKey]);
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// eslint-disable-next-line react-hooks/exhaustive-deps
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const setter = useCallback((value: T): T => store.set(storageKey, value) as T, [storageKey]);
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return [getter, setter];
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}
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