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import { twox128 } from "../crypto/mod.ts"import * as $ from "../deps/scale.ts"
export function $storageKey<I, O>(  palletName: string,  entryName: string,  $key: $.Codec<I, O>,): $.Codec<I, O> {  const palletHash = twox128.hash(new TextEncoder().encode(palletName))  const entryHash = twox128.hash(new TextEncoder().encode(entryName))  return $.createCodec({    _metadata: $.metadata("$storageKey", $storageKey, palletName, entryName, $key),    _staticSize: $key._staticSize + 32,    _encode(buffer, key) {      buffer.insertArray(palletHash)      buffer.insertArray(entryHash)      $key._encode(buffer, key)    },    _decode(buffer) {      // Ignore initial hashes      buffer.index += 32      return $key._decode(buffer)    },    _assert(assert) {      $key._assert(assert)    },  })}
export const $emptyKey = $.withMetadata($.metadata("$emptyKey"), $.constant<void>(undefined))
export const $partialEmptyKey = $.createCodec<void | null>({  _metadata: $.metadata("$partialEmptyKey"),  _staticSize: 0,  _encode() {},  _decode() {    throw new Error("Cannot decode partial key")  },  _assert(assert) {    if (assert.value != null) {      throw new $.ScaleAssertError(this, assert.value, `${assert.path} != null`)    }  },})
export function $partialSingleKey<I, O>($inner: $.Codec<I, O>): $.Codec<I | null, O | null> {  return $.createCodec({    _metadata: $.metadata("$partialSingleKey", $partialSingleKey, $inner),    _staticSize: $inner._staticSize,    _encode(buffer, key) {      if (key !== null) $inner._encode(buffer, key)    },    _decode() {      throw new Error("Cannot decode partial key")    },    _assert(assert) {      if (assert.value === null) return      $inner._assert(assert)    },  })}
export type PartialMultiKey<T extends unknown[]> = T extends [...infer A, any]  ? T | PartialMultiKey<A>  : T | null
export function $partialMultiKey<T extends $.AnyCodec[]>(  ...keys: [...T]): $.Codec<PartialMultiKey<$.OutputTuple<T>>>export function $partialMultiKey<T>(...codecs: $.Codec<T>[]): $.Codec<T[] | null> {  return $.createCodec({    _metadata: $.metadata("$partialMultiKey", $partialMultiKey, ...codecs),    _staticSize: $.tuple(...codecs)._staticSize,    _encode(buffer, key) {      if (!key) return      for (let i = 0; i < key.length; i++) {        codecs[i]!._encode(buffer, key[i]!)      }    },    _decode() {      throw new Error("Cannot decode partial key")    },    _assert(assert) {      if (assert.value === null) return      assert.instanceof(this, Array)      const assertLength = assert.key(this, "length")      assertLength.typeof(this, "number")      const length = assertLength.value as number      $.tuple(...codecs.slice(0, length))._assert(assert)    },  })}