text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  const common = require('../common');
  if (common.isIBMi)
    common.skip('IBMi does not support fs.watch()');
  
  const assert = require('assert');
  const fs = require('fs');
  const path = require('path');
  
  const tmpdir = require('../common/tmpdir');
  
  if (!common.isMainThread)
    common.skip('process.chdir is not available in Workers');
  
  const expectFilePath = common.isWindows ||
                         common.isLinux ||
                         common.isOSX ||
                         common.isAIX;
  
  const testDir = tmpdir.path;
  
  tmpdir.refresh();
  
  {
    const filepath = path.join(testDir, 'watch.txt');
  
    fs.writeFileSync(filepath, 'hello');
  
    const watcher = fs.watch(filepath);
    watcher.on('change', common.mustCall(function(event, filename) {
      assert.strictEqual(event, 'change');
  
      if (expectFilePath) {
        assert.strictEqual(filename, 'watch.txt');
      }
      watcher.close();
    }));
  
    setImmediate(function() {
      fs.writeFileSync(filepath, 'world');
    });
  }
  
  {
    const filepathAbs = path.join(testDir, 'hasOwnProperty');
  
    process.chdir(testDir);
  
    fs.writeFileSync(filepathAbs, 'howdy');
  
    const watcher =
      fs.watch('hasOwnProperty', common.mustCall(function(event, filename) {
        assert.strictEqual(event, 'change');
  
        if (expectFilePath) {
          assert.strictEqual(filename, 'hasOwnProperty');
        }
        watcher.close();
      }));
  
    setImmediate(function() {
      fs.writeFileSync(filepathAbs, 'pardner');
    });
  }
  
  {
    const testsubdir = fs.mkdtempSync(testDir + path.sep);
    const filepath = path.join(testsubdir, 'newfile.txt');
  
    const watcher =
      fs.watch(testsubdir, common.mustCall(function(event, filename) {
        const renameEv = common.isSunOS || common.isAIX ? 'change' : 'rename';
        assert.strictEqual(event, renameEv);
        if (expectFilePath) {
          assert.strictEqual(filename, 'newfile.txt');
        } else {
          assert.strictEqual(filename, null);
        }
        watcher.close();
      }));
  
    setImmediate(function() {
      const fd = fs.openSync(filepath, 'w');
      fs.closeSync(fd);
    });
  
  }
  
  // https://github.com/joyent/node/issues/2293 - non-persistent watcher should
  // not block the event loop
  {
    fs.watch(__filename, { persistent: false }, common.mustNotCall());
  }
  
  // Whitebox test to ensure that wrapped FSEvent is safe
  // https://github.com/joyent/node/issues/6690
  {
    let oldhandle;
    common.expectsInternalAssertion(
      () => {
        const w = fs.watch(__filename, common.mustNotCall());
        oldhandle = w._handle;
        w._handle = { close: w._handle.close };
        w.close();
      },
      'handle must be a FSEvent'
    );
    oldhandle.close(); // clean up
  }
  