function isBooleanimport { isBoolean } from "https://dotland.deno.dev/x/polkadot@0.2.23/util/mod.ts"; isBoolean(value: unknown): value is booleanExamples import { isBoolean } from 'https://deno.land/x/polkadot@0.2.23/util/mod.ts'; isBoolean(false); // => true Parametersvalue: unknownReturnsvalue is boolean