pezkuwi-api/packages/bizinikiwi-bindings/upstream-src/codecs/blockHeader.ts

import {
  Bytes,
  CodecType,
  Struct,
  Vector,
  _void,
  enhanceCodec,
  Hex,
  Variant,
  compactNumber,
} from "./scale"

const textEncoder = new TextEncoder()
const textDecoder = new TextDecoder()

const fourChars = enhanceCodec(
  Bytes(4),
  textEncoder.encode.bind(textEncoder),
  textDecoder.decode.bind(textDecoder),
)

const diggestVal = Struct({
  engine: fourChars,
  payload: Hex(),
})

const diggest = Variant(
  {
    other: Bytes(),
    consensus: diggestVal,
    seal: diggestVal,
    preRuntime: diggestVal,
    runtimeUpdated: _void,
  },
  [0, 4, 5, 6, 8],
)

const hex32 = Hex(32)
export const blockHeader = Struct({
  parentHash: hex32,
  number: compactNumber,
  stateRoot: hex32,
  extrinsicRoot: hex32,
  digests: Vector(diggest),
})

export type BlockHeader = CodecType<typeof blockHeader>