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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import {  assert,  assertEquals,  assertStringIncludes,} from "../../testing/asserts.ts";import { exists, existsSync } from "./_fs_exists.ts";import { readAll } from "../../streams/conversion.ts";
Deno.test("existsFile", async function () {  const availableFile = await new Promise((resolve) => {    const tmpFilePath = Deno.makeTempFileSync();    exists(tmpFilePath, (exists: boolean) => {      Deno.removeSync(tmpFilePath);      resolve(exists);    });  });  const notAvailableFile = await new Promise((resolve) => {    exists("./notAvailable.txt", (exists: boolean) => resolve(exists));  });  assertEquals(availableFile, true);  assertEquals(notAvailableFile, false);});
Deno.test("existsSyncFile", function () {  const tmpFilePath = Deno.makeTempFileSync();  assertEquals(existsSync(tmpFilePath), true);  Deno.removeSync(tmpFilePath);  assertEquals(existsSync("./notAvailable.txt"), false);});
Deno.test("[std/node/fs] exists callback isn't called twice if error is thrown", async () => {  // This doesn't use `assertCallbackErrorUncaught()` because `exists()` doesn't return a standard node callback, which is what it expects.  const tempFile = await Deno.makeTempFile();  const importUrl = new URL("./_fs_exists.ts", import.meta.url);  const p = Deno.run({    cmd: [      Deno.execPath(),      "eval",      "--no-check",      `      import { exists } from ${JSON.stringify(importUrl)};
      exists(${JSON.stringify(tempFile)}, (exists) => {        // If the bug is present and the callback is called again with false (meaning an error occurred),        // don't throw another error, so if the subprocess fails we know it had the correct behaviour.        if (exists) throw new Error("success");      });`,    ],    stderr: "piped",  });  const status = await p.status();  const stderr = new TextDecoder().decode(await readAll(p.stderr));  p.close();  p.stderr.close();  await Deno.remove(tempFile);  assert(!status.success);  assertStringIncludes(stderr, "Error: success");});