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	"readme": "# eth-block-tracker\n\nThis module walks the Ethereum blockchain, keeping track of the latest block.\nIt uses a web3 provider as a data source and will continuously poll for the next block.\n\n```js\nconst HttpProvider = require('ethjs-provider-http')\nconst PollingBlockTracker = require('eth-block-tracker')\n\nconst provider = new HttpProvider('https://mainnet.infura.io')\nconst blockTracker = new PollingBlockTracker({ provider })\nblockTracker.on('latest', console.log)\n```\n\n### methods\n\n##### new PollingBlockTracker({ provider, pollingInterval, retryTimeout, keepEventLoopActive })\n\ncreates a new block tracker with `provider` as a data source and\n`pollingInterval` (ms) timeout between polling for the latest block.\nIf an Error is encountered when fetching blocks, it will wait `retryTimeout` (ms) before attempting again.\nIf `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\n##### getCurrentBlock()\n\nsynchronous 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.\nif 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.\nUseful if you received a hint of a new block (e.g. via `tx.blockNumber` from `getTransactionByHash`).\nWill resolve to the new latest block when its done polling.\n\n### EVENTS\n\n##### latest\n\nThe `latest` event is emitted for whenever a new latest block is detected.\nThis 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 }) => console.log(newBlock, oldBlock))\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### NOTES\n\nVersion 4.x.x differs significantly from version 3.x.x\n\nPlease see the [CHANGELOG](./CHANGELOG.md)."
}