function promisifyimport { promisify } from "https://dotland.deno.dev/x/polkadot@0.2.35/util/index.ts"; promisify<R = any>(self: unknown,fn: (...params: any) => any,...params: any[],): Promise<R>Examples const { promisify } from '@polkadot/util'; await promisify(null, ((a, cb) => cb(null, a), true); // resolves with `true` await promisify(null, (cb) => cb(new Error('error!'))); // rejects with `error!` Type ParametersoptionalR = anyParametersself: unknownfn: (...params: any) => any...params: any[]ReturnsPromise<R>