@graphprotocol/client-block-tracking/esm/plugin.js

`graph-client` implements automatic block tracking using `number_gte` filter of `graph-node`. This automates the process [of fetching and tracking the block number of entites](https://thegraph.com/docs/en/developer/distributed-systems/#polling-for-updated

import { isAsyncIterable } from '@graphql-tools/utils';
import { DEFAULT_CONFIG, getNewBlockNumberFromExecutionResult, transformExecutionRequest, } from './shared.js';
export function useBlockTracking(configInput) {
    const config = {
        ...DEFAULT_CONFIG,
        ...configInput,
    };
    const minBlockMap = new Map();
    return {
        onSubgraphExecute({ subgraph, subgraphName, executionRequest, setExecutionRequest }) {
            setExecutionRequest(transformExecutionRequest(executionRequest, config, subgraph, false, minBlockMap.get(subgraphName)));
            function handleResult(result) {
                const newBlockNumber = getNewBlockNumberFromExecutionResult(result, config);
                const currentMinBlockNumber = minBlockMap.get(subgraphName);
                if (newBlockNumber != null && (currentMinBlockNumber == null || newBlockNumber > currentMinBlockNumber)) {
                    minBlockMap.set(subgraphName, newBlockNumber);
                }
            }
            return ({ result }) => {
                if (isAsyncIterable(result)) {
                    return {
                        onNext({ result }) {
                            handleResult(result);
                        },
                    };
                }
                handleResult(result);
                return;
            };
        },
    };
}