function assertExistsimport { assertExists } from "https://deno.land/x/fastro@v0.85.1/http/server/deps.ts"; assertExists<T>(actual: T, msg?: string): asserts actual is NonNullable<T>Make an assertion that actual is not null or undefined. If not then throw. ExamplesExample 1 import { assertExists } from "https://deno.land/std@0.224.0/assert/assert_exists.ts"; assertExists("something"); // Doesn't throw assertExists(undefined); // Throws Type ParametersTParametersactual: Toptionalmsg: stringReturnsasserts actual is NonNullable<T>