test/parallel/test-fs-promises-file-handle-close.js


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// Flags: --expose-gc --no-warnings
'use strict';

// Test that a runtime warning is emitted when a FileHandle object
// is allowed to close on garbage collection. In the future, this
// test should verify that closing on garbage collection throws a
// process fatal exception.

const common = require('../common');
const assert = require('assert');
const { promises: fs } = require('fs');

const warning =
  'Closing a FileHandle object on garbage collection is deprecated. ' +
  'Please close FileHandle objects explicitly using ' +
  'FileHandle.prototype.close(). In the future, an error will be ' +
  'thrown if a file descriptor is closed during garbage collection.';

async function doOpen() {
  const fh = await fs.open(__filename);

  common.expectWarning({
    Warning: [[`Closing file descriptor ${fh.fd} on garbage collection`]],
    DeprecationWarning: [[warning, 'DEP00XX']]
  });

  return fh;
}

// Perform the file open assignment within a block.
// When the block scope exits, the file handle will
// be eligible for garbage collection.
{
  doOpen().then(common.mustCall((fd) => {
    assert.strictEqual(typeof fd, 'object');
  }));
}

setTimeout(() => global.gc(), 10);