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