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Change Log

5.4.1

  • Avoid errors in fs.existsSync (see #401)

5.4.0

  • Use setImmediate instead of process.nextTick (thanks @regseb, see #360)
Dependency Updates
  • bump chai from 4.3.4 to 4.5.0
  • bump eslint from 8.21.0 to 8.57.1

5.3.0

  • Remove conditions for untested versions
  • Remove disabled tests for mock.fs (thanks @everett1992, see #391)
  • Fix tests on node 20 (thanks @everett1992, see #387)
  • Fix timeout in failing test (thanks @everett1992, see #390)
  • Stop testing on Node 12 and 14
Dependency Updates
  • chore(deps-dev): bump rimraf from 3.0.2 to 6.0.1
  • chore(deps): bump actions/checkout from 2 to 4
  • chore(deps-dev): bump mocha from 9.2.2 to 10.7.3
  • chore(deps-dev): bump braces from 3.0.2 to 3.0.3
  • chore(deps-dev): bump word-wrap from 1.2.3 to 1.2.4
  • chore(deps): bump json5 from 1.0.1 to 1.0.2

5.2.0

  • Fix EACCES error on access by root user (thanks @danielkatz, see #369)
  • Fix bug on utimes and futimes; add support of lutimes (thanks @3cp, see #366)

5.1.4

  • Fix for BigInt stats in Node 16.7 (thanks @ahippler, see #363)

5.1.3

  • Fix for BigInt stats in Node 18.7 (thanks @3cp, see #361)

5.1.2

  • Avoid open FSREQCALLBACK file handles (thanks @jloleysens, see #342)

5.1.1

  • Added engines to package.json to clarify that Node >= 12 is required (thanks @tillig, see #337)

5.1.0

  • Added support for Node >= 16.3 (thanks @Rugvip, see #335)

5.0.0

Breaking change:

  • Remove support for Node < 12. If you want to use mock-fs to test on Node 10 or lower, stick with mock-fs@4.

New features:

  • Support for BigInt file stats - required for Node 15+ (thanks @3cp, see #325)

4.14.0

  • Attempt to fix logging when using mock-fs with tape (see #322)
  • Minor fix for bypass() (thanks @3cp, see #320)

4.13.0

  • Make process.chdir(), process.cwd(), and fs.createWriteStream() work with bypass() (thanks @3cp, see #307)
  • Fix memory leak associated with Node 10 (thanks @3cp, see #303)
  • Async function handling in bypass() (see #306)
  • Big new feature! Temporarily bypass the mocked filesystem with the bypass() function (thanks @nonara, see #304)

4.12.0

  • Check permissions in readdir and readdirSync (thanks @warpdesign, see #295)
  • Add support for Buffer arg on many fs functions (thanks @3cp, see #293)
  • Fix checks for read permission (thanks @3cp, see #289)
  • Correct error code for readFile on a directory (thanks @3cp, see #286)

4.11.0

  • Support withFileTypes when reading directories (thanks @mrmlnc, see #287)

4.10.4

  • Throw ENOTDIR when trying to open an incorrect path (thanks @niieani, see #282)
  • Fix maybeCallback return (thanks @3cp, see #281)

4.10.3

  • Fix bad promise rejection on some fs.promises methods (thanks @3cp, see #279)

4.10.2

  • Fix timestamps for Node > 12.10 (thanks @3cp, see #277)

4.10.1

  • Fix for fs.mkdir with the recursive option on existing directories (thanks @3cp, see #271)

4.10.0

  • Support the recursive option for fs.mkdir (thanks @3cp, see #268)

4.9.0

  • Improve readFile support for Node 10+ (thanks @huochunpeng, see #265)
  • Updated dev dependencies (see #267)

4.8.0

  • Fix compatibility issues with Node 10 and 11 (thanks @huochunpeng #260)
  • Support experimental fs.promises (thanks @huochunpeng #260)

4.7.0

  • Fix for readdir on Node 10.10 (thanks @maxwellgerber #251)
  • Fix for reading and writing using Uint8Array (thanks @maxwellgerber #249)
  • Document how to properly restore the fs with Jest snapshot testing (thanks @tricoder42 #247)
  • More informative error when opening a directory (thanks @maxwellgerber #242)

4.6.0

Note that the mocked fs.createReadStream and fs.createWriteStream are not working properly with Node 10.5+.

  • Implement binding.copyFile (#243)
  • Stat fixes for Node 10.5 (thanks @tomhughes, see [#241][#241])

4.5.0

  • Updates for Node 10 compatibility (#237)
  • Throw ENOENT in readlink when item is missing (thanks @deployable, see #232)
  • Add path to errors when it exists (thanks @deployable, see #230)

4.4.2

  • Throw if item content is invalid in config (thanks @mutantcornholio, see #221)
  • Use const in readme (thanks @denar90, see #222)

4.4.1

  • Document that tests are run on Node 8.x as well.

4.4.0

  • Fix stat issue with Node 8 (thanks @AGrzes, see #209)
  • Make code prettier (see #210)

4.3.0

  • Add support for fs.mkdtemp() and fs.mkdtempSync (see #207)

4.2.0

  • Update fs.stat(), fs.lstat(), and fs.fstat() for Node 7.7+ (thanks @not-an-aardvark, see #198)

4.1.0

  • Correctly follow a symlink chain in binding.open() (thanks @vlindhol, see #195)

4.0.0

In earlier versions of mock-fs, a monkey-patched version of the fs module was used to provide an in-memory filesystem. With each major release of Node, the mock-fs package needed to include a modified copy of the fs module. With the mock-fs@4 release, this package no longer includes a modified copy of the fs module. Instead, this package overrides process.binding('fs'). While this is not part of Node's stable API, it has proven to be a more stable interface than the fs module itself (based on experience implementing it with Node 0.8 through 7.0).

Upgrading from 3.x to 4.0 should be straightforward for most applications. There are several breaking changes that may be restored in future releases:

  • The mock.fs() function has been removed.
  • The object created by fs.stat() and friends is no longer an instance of fs.Stats (though it behaves as one).
  • Lazy require() calls do not work consistently.

Detailed changes:

  • Only override process.binding('fs') (#182)
  • Expose the root of the mocked filesystem (thanks @ciaranj, see #194)

3.12.1

  • Revert the require cache clearing behavior (#181).

3.12.0

  • Support for Node 7.x (thanks @goliney, see #174).
  • Remove calls to printDeprecation (#175).
  • Break early when checking version (thanks @isiahmeadows, see #157).
  • Add a note about restoring fs (thanks @matheuss, see #147).
  • Clear the require cache before overriding fs functions (#141)

3.11.0

  • Make require() calls use the real filesystem (#139).
  • Reduce the manual fs module patching (#140).

3.10.0

  • Fixes for Node 6.3 (#138).
  • Fix permissions issues on directories (thanks @as3richa, see #105).

3.9.0

  • Support for Node 6.x (thanks @tmcw, see #107).

3.8.0

  • Implement binding.writeBuffers() (see #94).

3.7.0

  • Add support for fs.access() and fs.accessSync() (thanks @shyiko, see #78 and #80).

3.6.0

  • Add createCwd and createTmp options to control the creation of process.cwd() and os.tmpdir() directories in the mocked filesystem (see #72).
  • Update Travis and AppVeyor configurations (see #73)
  • Remove unused dev dependency (see #75)

3.5.0

  • Support for Node 5.x (thanks @tmcw, see #69).

3.4.0

  • Support for Node 4.x (thanks @AlexMeah, see #65).

3.3.0

3.2.0

  • Support for io.js 3.0 (thanks @JustBlackBird, see #61).

3.1.0

  • Follow symlinks in readdir() and readdirSync() (thanks @caitp, see #56).

3.0.0

  • Override process.cwd() and process.chdir() to work with mocked filesystem (thanks @timkendrick, see #41).
  • Add note about known incompatibilities (thanks @psalaets, see #45).

2.7.0

  • Support for io.js 2.0 (thanks @jwilsson, see #38).

2.6.0

  • Add birthtime to Stats objects (thanks @meandmycode, see #33).

2.5.0

  • Support for io.js 1.1 (thanks @andrewblond, see #21).
  • Testing on Windows with AppVeyor (thanks @andrewblond, see #22).

2.4.0

  • Support for Node 0.12 (thanks @mlegenhausen, see #18).

2.3.1

  • Preserve arity of callbacks (see #11).

2.3.0

  • Fixes for Node 0.11.13 (see #9).

2.2.0

  • Respect file mode on POSIX-compliant systems (see #7).
  • Add benchmarks comparing mock-fs and fs modules (see #6).

2.1.2

  • Added more complete license text.
  • Test on Node 0.9 and 0.11 in addition to 0.8 and 0.10.

2.1.1

  • Added this changelog.
  • Removed unused gruntfile.js.

2.1.0

  • Directory mtime is now updated when items are added, removed, or modified (#2).
  • Fixed several issues on Windows (see #3). One issue remains on Windows with Node 0.8 (see #4).
  • Swapped out Grunt with a single script to run tasks (see #5).

2.0.0

  • Simplified API (see #1).