function unreachableimport { unreachable } from "https://deno.land/std@0.222.1/assert/unreachable.ts"; unreachable(reason?: string): neverUse this to assert unreachable code. ExamplesExample 1 import { unreachable } from "https://deno.land/std@0.222.1/assert/unreachable.ts"; unreachable(); // Throws Parametersoptionalreason: stringReturnsnever