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import * as ErrorSignature from 'voltaire-effect/ErrorSignature'
import * as Schema from 'effect/Schema'
import { Effect } from 'effect'

// From hex (Error(string) = 0x08c379a0)
const sig = Effect.runSync(ErrorSignature.from('0x08c379a0'))

// From signature string (computes keccak256, takes first 4 bytes)
const panic = Effect.runSync(ErrorSignature.fromSignature('Panic(uint256)'))
const error = Effect.runSync(ErrorSignature.fromSignature('Error(string)'))

// Compare
const isEqual = Effect.runSync(ErrorSignature.equals(sig, error)) // true

// To hex
const hex = Effect.runSync(ErrorSignature.toHex(sig)) // '0x08c379a0'

​
API

FunctionType
SchemaSchema<ErrorSignatureType, string | Uint8Array>
from(input: string | Uint8Array) => Effect<ErrorSignatureType, ErrorSignatureError>
fromHex(hex: string) => Effect<ErrorSignatureType, ErrorSignatureError>
fromSignature(sig: string) => Effect<ErrorSignatureType, ErrorSignatureError>
toHex(sig: ErrorSignatureType) => Effect<string>
equals(a, b) => Effect<boolean>

​
Example: Match Revert Selector

const matchError = (revertData: Uint8Array) =>
  Effect.gen(function* () {
    const selector = yield* ErrorSignature.from(revertData.slice(0, 4))
    const panic = yield* ErrorSignature.fromSignature('Panic(uint256)')
    if (yield* ErrorSignature.equals(selector, panic)) return 'panic'
    return 'custom'
  })