function assertimport { assert } from "https://deno.land/x/abc@v1.3.3/vendor/https/deno.land/std/testing/asserts.ts"; assert(expr: unknown, msg?): asserts exprMake an assertion, error will be thrown if expr does not have truthy value. Parametersexpr: unknownoptionalmsg = [UNSUPPORTED]Returnsasserts expr