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4-byte hash of prior forks + next fork block. Used for peer compatibility. 
import * as ForkId from 'voltaire-effect/primitives/ForkId'
import * as Schema from 'effect/Schema'
import { Effect } from 'effect'

// Schema validation
const forkId = Schema.decodeSync(ForkId.JSON)({
  hash: new Uint8Array([0xfc, 0x64, 0xec, 0x04]),
  next: 1150000n
})

// Effect constructor
const program = ForkId.from({
  hash: new Uint8Array([0xfc, 0x64, 0xec, 0x04]),
  next: 1150000n
})
const result = Effect.runSync(program)
console.log(result.hash, result.next)

​
Input Type

type ForkIdInput = {
  hash: Uint8Array  // 4 bytes
  next: bigint | number
}

​
Error Handling

const result = await Effect.runPromiseExit(
  ForkId.from({ hash: new Uint8Array([]), next: -1n })
)
// result._tag === 'Failure' → ForkIdError