function isStringimport { isString } from "https://deno.land/x/polkadot@0.2.37/util/is/index.ts"; isString(value: unknown): value is AnyStringExamples import { isString } from 'https://deno.land/x/polkadot@0.2.37/util/mod.ts'; console.log('isString', isString('test')); // => true Parametersvalue: unknownReturnsvalue is AnyString