json-rpc-engine middleware implementing ethereum filter methods.
Backed by an eth-block-tracker and web3 provider interface (web3.currentProvider).
eth_newFiltereth_newBlockFiltereth_newPendingTransactionFiltereth_uninstallFiltereth_getFilterChangeseth_getFilterLogs
basic usage:
const filterMiddleware = createFilterMiddleware({ blockTracker, provider })
engine.push(filterMiddleware)cleanup:
// remove blockTracker handler to free middleware for garbage collection
filterMiddleware.destroy()- expect EthBlockTracker@4