function util.isNullimport { util } from "https://dotland.deno.dev/x/polkadot@0.2.38/mod.ts"; const { isNull } = util; isNull(value?: unknown): value is nullExamples import { isNull } from 'https://deno.land/x/polkadot@0.2.38/util/mod.ts'; console.log('isNull', isNull(null)); // => true Parametersoptionalvalue: unknownReturnsvalue is null