function hexToStringimport { hexToString } from "https://dotland.deno.dev/x/polkadot@0.2.35/util/index.ts"; hexToString(_value?: string | null): stringExamples import { hexToString } from 'https://deno.land/x/polkadot@0.2.35/util/mod.ts'; hexToU8a('0x68656c6c6f'); // hello Parametersoptional_value: string | nullReturnsstring