function isFunctionimport { isFunction } from "https://dotland.deno.dev/x/polkadot@0.2.35/util/is/index.ts"; isFunction(value: unknown): value is FnTypeExamples import { isFunction } from 'https://deno.land/x/polkadot@0.2.35/util/mod.ts'; isFunction(() => false); // => true Parametersvalue: unknownReturnsvalue is FnType