function isUtf8import { isUtf8 } from "https://deno.land/x/polkadot@0.2.11/util/mod.ts"; isUtf8(value?: | HexString | number[] | Buffer | Uint8Array | string | null): booleanParametersoptionalvalue: | HexString | number[] | Buffer | Uint8Array | string | nullReturnsboolean