Skip to main content
import * as EventSignature from 'voltaire-effect/EventSignature'
import { Effect } from 'effect'

// From event signature string (computes keccak256)
const sig = yield* EventSignature.fromSignature('Transfer(address,address,uint256)')
// => 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef

// From raw hex
const sig2 = yield* EventSignature.fromHex('0xddf252ad...')

// From bytes
const sig3 = yield* EventSignature.from(topicBytes)

​
Functions

FunctionDescription
fromSignature(str)Hash event signature to topic
fromHex(hex)Parse 32-byte hex topic
from(bytes)From Uint8Array
toHex(sig)Convert to hex string
equals(a, b)Compare two signatures

​
Identifying Events

const transfer = yield* EventSignature.fromSignature('Transfer(address,address,uint256)')
const approval = yield* EventSignature.fromSignature('Approval(address,address,uint256)')

const isTransfer = yield* EventSignature.equals(log.topics[0], transfer)

​
Building Filters

const transferSig = yield* EventSignature.fromSignature('Transfer(address,address,uint256)')
const topicHex = yield* EventSignature.toHex(transferSig)

const filter = { address: contractAddress, topics: [topicHex] }