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