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import type { HexString } from 'https://deno.land/x/polkadot@0.2.33/util/types.ts';import type { Keypair } from '../types.ts';
import { u8aToU8a } from 'https://deno.land/x/polkadot@0.2.33/util/mod.ts';import { vrfSign } from 'https://deno.land/x/polkadot@0.2.33/wasm-crypto/mod.ts';
const EMPTY_U8A = new Uint8Array();
/** * @name sr25519VrfSign * @description Sign with sr25519 vrf signing (deterministic) */export function sr25519VrfSign (message: HexString | Uint8Array | string, { secretKey }: Partial<Keypair>, context: HexString | string | Uint8Array = EMPTY_U8A, extra: HexString | string | Uint8Array = EMPTY_U8A): Uint8Array {  if (secretKey?.length !== 64) {    throw new Error('Invalid secretKey, expected 64-bytes');  }
  return vrfSign(secretKey, u8aToU8a(context), u8aToU8a(message), u8aToU8a(extra));}