Valentin Fernandez
ed62d164ea
* document derives from accounts to democracy * Derive Documentation progress * Derive Documentation progress * tx and staking docs * Staking docs progress * more staking docs * Staking module complete * imonline, elections and progress in democracy * Document missing derives * lint
31 lines
998 B
TypeScript
31 lines
998 B
TypeScript
// Copyright 2017-2025 @polkadot/api-derive authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { Observable } from 'rxjs';
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import type { SignedBlockExtended } from '../type/types.js';
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import type { DeriveApi } from '../types.js';
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import { switchMap } from 'rxjs';
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import { memo } from '../util/index.js';
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/**
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* @name subscribeFinalizedBlocks
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* @description Retrieves the finalized block & events for that block
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* @example
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* ```javascript
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* const unsub = await api.derive.chain.subscribeFinalizedBlocks((finalizedBlock) => {
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* console.log(`# Finalized block ${finalizedBlock.block.hash}`);
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* });
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* ```
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*/
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export function subscribeFinalizedBlocks (instanceId: string, api: DeriveApi): () => Observable<SignedBlockExtended> {
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return memo(instanceId, (): Observable<SignedBlockExtended> =>
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api.derive.chain.subscribeFinalizedHeads().pipe(
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switchMap((header) =>
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api.derive.chain.getBlock(header.createdAtHash || header.hash)
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)
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)
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);
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}
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