function isContentNegotiationHeaderimport { isContentNegotiationHeader } from "https://deno.land/x/http_utils@1.0.0/header.ts"; isContentNegotiationHeader(input: string): input is `${ContentNegotiationHeader}`Whether the input is ContentNegotiationHeader or not. ExamplesExample 1 import { isContentNegotiationHeader } from "https://deno.land/x/http_utils@$VERSION/header.ts"; import { assert } from "https://deno.land/std@$VERSION/testing/asserts.ts"; assert(isContentNegotiationHeader("accept")); assert(!isContentNegotiationHeader("<others>")); Parametersinput: stringReturnsinput is `${ContentNegotiationHeader}`