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// Copyright 2018-2024 the oak authors. All rights reserved. MIT license.
import type { State } from "../application.ts";import type { Context } from "../context.ts";import type { RouteParams, RouterContext } from "../router.ts";import type { NetAddr } from "../types.ts";
import "../node_shims.ts";
/** Guard for Async Iterables */export function isAsyncIterable(  value: unknown,): value is AsyncIterable<unknown> {  return typeof value === "object" && value !== null &&    Symbol.asyncIterator in value &&    // deno-lint-ignore no-explicit-any    typeof (value as any)[Symbol.asyncIterator] === "function";}
export function isBun(): boolean {  return "Bun" in globalThis;}
/** Determines if a string "looks" like HTML */export function isHtml(value: string): boolean {  return /^\s*<(?:!DOCTYPE|html|body)/i.test(value);}
export function isListenTlsOptions(  value: unknown,): value is Deno.ListenTlsOptions {  return typeof value === "object" && value !== null &&    ("cert" in value || "certFile" in value) &&    ("key" in value || "keyFile" in value) && "port" in value;}
export function isNetAddr(value: unknown): value is NetAddr {  return typeof value === "object" && value != null && "transport" in value &&    "hostname" in value && "port" in value;}
export function isNode(): boolean {  return "process" in globalThis && "global" in globalThis &&    !("Bun" in globalThis) && !("WebSocketPair" in globalThis);}
/** Guard for `Deno.Reader`. */export function isReader(value: unknown): value is Deno.Reader {  return typeof value === "object" && value !== null && "read" in value &&    typeof (value as Record<string, unknown>).read === "function";}
export function isRouterContext<  R extends string,  P extends RouteParams<R>,  S extends State,>(  value: Context<S>,): value is RouterContext<R, P, S> {  return "params" in value;}