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It uses a web3 provider as a data source and will continuously poll for the next block.\n\n## Installation\n\n`yarn add @metamask/eth-block-tracker`\n\nor\n\n`npm install @metamask/eth-block-tracker`\n\n## Usage\n\n```js\nconst createInfuraProvider = require('@metamask/eth-json-rpc-infura');\nconst { PollingBlockTracker } = require('@metamask/eth-block-tracker');\n\nconst provider = createInfuraProvider({\n  network: 'mainnet',\n  projectId: process.env.INFURA_PROJECT_ID,\n});\nconst blockTracker = new PollingBlockTracker({ provider });\n\nblockTracker.on('sync', ({ newBlock, oldBlock }) => {\n  if (oldBlock) {\n    console.log(`sync #${Number(oldBlock)} -> #${Number(newBlock)}`);\n  } else {\n    console.log(`first sync #${Number(newBlock)}`);\n  }\n});\n```\n\n## API\n\n### Methods\n\n#### new PollingBlockTracker({ provider, pollingInterval, retryTimeout, keepEventLoopActive, usePastBlocks })\n\n- Creates a new block tracker with `provider` as a data source and `pollingInterval` (ms) timeout between polling for the latest block.\n- If an error is encountered when fetching blocks, it will wait `retryTimeout` (ms) before attempting again.\n- If `keepEventLoopActive` is `false`, in Node.js it will [unref the polling timeout](https://nodejs.org/api/timers.html#timers_timeout_unref), allowing the process to exit during the polling interval. Defaults to `true`, meaning the process will be kept alive.\n- If `usePastBlocks` is `true`, block numbers less than the current block number can used and emitted. Defaults to `false`, meaning that only block numbers greater than the current block number will be used and emitted.\n\n#### getCurrentBlock()\n\nSynchronously returns the current block. May be `null`.\n\n```js\nconsole.log(blockTracker.getCurrentBlock());\n```\n\n#### async getLatestBlock()\n\nAsynchronously returns the latest block. if not immediately available, it will fetch one.\n\n#### async checkForLatestBlock()\n\nTells the block tracker to ask for a new block immediately, in addition to its normal polling interval. Useful if you received a hint of a new block (e.g. via `tx.blockNumber` from `getTransactionByHash`). Will resolve to the new latest block when done polling.\n\n### Events\n\n#### latest\n\nThe `latest` event is emitted for whenever a new latest block is detected. This may mean skipping blocks if there were two created since the last polling period.\n\n```js\nblockTracker.on('latest', (newBlock) => console.log(newBlock));\n```\n\n#### sync\n\nThe `sync` event is emitted the same as \"latest\" but includes the previous block.\n\n```js\nblockTracker.on('sync', ({ newBlock, oldBlock }) =>\n  console.log(newBlock, oldBlock),\n);\n```\n\n#### error\n\nThe `error` event means an error occurred while polling for the latest block.\n\n```js\nblockTracker.on('error', (err) => console.error(err));\n```\n\n## Contributing\n\nThis package is part of a monorepo. Instructions for contributing can be found in the [monorepo README](https://github.com/MetaMask/core#readme).\n","_attachments":{},"homepage":"https://github.com/MetaMask/core/tree/main/packages/eth-block-tracker#readme","bugs":{"url":"https://github.com/MetaMask/core/issues"},"license":"MIT"}