function isStringimport { isString } from "https://deno.land/x/isx@1.0.0-beta.18/mod.ts"; isString(value: unknown): value is stringWhether the value is string or not. Parametersvalue: unknown Any value. import { isString } from "https://deno.land/x/isx@$VERSION/mod.ts" import { assertEquals } from "https://deno.land/std@$VERSION/testing/asserts.ts" assertEquals(isString('hello world'), true) assertEquals(isString(1000), false) Returnsvalue is string