42 lines
1.3 KiB
TypeScript
42 lines
1.3 KiB
TypeScript
// Copyright 2017-2022 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { QueryableStorageEntry } from '@polkadot/api/types';
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import { useEffect, useRef, useState } from 'react';
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import { stringify } from '@polkadot/util';
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interface Options <T> {
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transform?: (value: any[]) => T[];
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}
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// FIXME This is generic, we cannot really use createNamedHook
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export function useMapKeys <T = any> (entry: QueryableStorageEntry<'promise'> | null | false | undefined, params: unknown[], { transform }: Options<T> = {}, at?: string | null | false): T[] | undefined {
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const [state, setState] = useState<T[] | undefined>();
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const checkRef = useRef<string | null>(null);
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useEffect((): void => {
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if (entry) {
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const check = stringify({ at, params });
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if (check !== checkRef.current) {
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checkRef.current = check;
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(
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at && at !== '0'
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// eslint-disable-next-line deprecation/deprecation
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? entry.keysAt(at, ...params)
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: entry.keys(...params)
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).then((keys) => setState(
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transform
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? transform(keys)
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: keys as unknown as T[]
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)).catch(console.error);
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}
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}
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}, [at, entry, params, transform]);
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return state;
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}
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