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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.import {  assert,  assertEquals,  assertStringIncludes,} from "../testing/asserts.ts";
import * as path from "../path/mod.ts";import { createRequire } from "./module.ts";
const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));const testdataDir = path.resolve(moduleDir, path.join("_fs", "testdata"));
const require = createRequire(import.meta.url);
Deno.test("requireSuccess", function () {  // Relative to import.meta.url  const result = require("./_module/cjs/cjs_a.js");  assert("helloA" in result);  assert("helloB" in result);  assert("C" in result);  assert("leftPad" in result);  assertEquals(result.helloA(), "A");  assertEquals(result.helloB(), "B");  assertEquals(result.C, "C");  assertEquals(result.leftPad("pad", 4), " pad");});
Deno.test("requireCycle", function () {  const resultA = require("./_module/cjs/cjs_cycle_a");  const resultB = require("./_module/cjs/cjs_cycle_b");  assert(resultA);  assert(resultB);});
Deno.test("requireBuiltin", function () {  const fs = require("fs");  assert("readFileSync" in fs);  const { readFileSync, isNull, extname } = require(    "./_module/cjs/cjs_builtin",  );
  const testData = path.relative(    Deno.cwd(),    path.join(testdataDir, "hello.txt"),  );  assertEquals(    readFileSync(testData, { encoding: "utf8" }),    "hello world",  );  assert(isNull(null));  assertEquals(extname("index.html"), ".html");});
Deno.test("requireIndexJS", function () {  const { isIndex } = require("./_module/cjs");  assert(isIndex);});
Deno.test("requireNodeOs", function () {  const os = require("os");  assert(os.arch);  assert(typeof os.arch() == "string");});
Deno.test("requireStack", function () {  const { hello } = require("./_module/cjs/cjs_throw");  try {    hello();  } catch (e) {    assert(e instanceof Error);    assert(e.stack);    assertStringIncludes(e.stack, "/_module/cjs/cjs_throw.js");  }});
Deno.test("requireFileInSymlinkDir", () => {  const { C } = require("./_module/cjs/dir");  assertEquals(C, "C");});
Deno.test("requireModuleWithConditionalExports", () => {  const { red, blue } = require("./_module/cjs/cjs_conditional_exports");  assert(typeof red === "function");  assert(typeof blue === "function");});
Deno.test("requireNodeJsNativeModules", () => {  // Checks these exist and don't throw.  require("assert");  require("assert/strict");  require("buffer");  require("child_process");  require("console");  require("constants");  require("crypto");  require("events");  require("fs");  require("fs/promises");  require("module");  require("os");  require("path");  require("perf_hooks");  require("querystring");  require("stream");  require("string_decoder");  require("timers");  require("tty");  require("url");  require("util");
  // TODO(kt3k): add these modules when implemented  // require("cluster");  // require("dgram");  // require("dns");  // require("http");  // require("http2");  // require("https");  // require("net");  // require("readline");  // require("repl");  // require("sys");  // require("tls");  // require("vm");  // require("worker_threads");  // require("zlib");});
Deno.test("native modules are extensible", () => {  const randomKey = "random-key";  const randomValue = "random-value";  const modNames = [    "assert",    "buffer",    "child_process",    "crypto",    "events",    "fs",    "module",    "os",    "path",    "querystring",    "stream",    "string_decoder",    "timers",    "url",    "util",  ];  for (const name of modNames) {    const mod = require(name);    Object.defineProperty(mod, randomKey, {      value: randomValue,      configurable: true,    });    assertEquals(mod[randomKey], randomValue);    delete mod[randomKey];    assertEquals(mod[randomKey], undefined);  }});
Deno.test("Require file with shebang", () => {  require("./testdata/shebang.js");});
Deno.test("EventEmitter is exported correctly", () => {  const EventEmitter = require("events");  assertEquals(EventEmitter, EventEmitter.EventEmitter);});