Some dependency seems to get skipped and unable to find (chokidar)

[sairion]

Do you want to request a feature or report a bug?
bug
What is the current behavior?
after install, I am seeing errors 'chokidar' is not installed. It seems to be included in babel-cli, watchpack, etc modules but it is not in node_modules. However, I can chokidar in yarn.lock. This makes me enable to do webpack --watch
If the current behavior is a bug, please provide the steps to reproduce.

{
  "name": "yarnjs-bug-missing-deps",
  "description": "",
  "version": "1.0.0",
  "author": "Jaeho Lee <jaeho@dev.fancy.com>",
  "licenses": "proprietary",
  "scripts": {
    "postinstall": ""
  },
  "devDependencies": {
    "babel-cli": "^6.16.0",
    "babel-core": "^6.4.5",
    "webpack": "^1.12.12"
  }
}

Use this package.json to yarn and see chokidar is missing in node_modules

What is the expected behavior?
chokidar shouldn't be missing; There could be another dependencies gone missing but currently chokidar is only thing I can find so far.
Please mention your node.js, yarn and operating system version.
Node v6.3.0, OSX 10.10.5

[sebmck]

Thanks for the report! Can you please post the output of yarn ls? I'm wondering if we're just putting it in the wrong location or are omitting it entirely.

[sairion]

@kittens Actually, I think I found a clue. When I install webpack solely, chokidar is in correct place. But when I include babel-cli as a dependency, it goes away. babel-cli declared chokidar as optionalDependencies and I think #628 could be a related issue.

Below is output of yarn ls when babel-cli is only dependency in package.json.

yarn ls v0.15.0
warning yarnjs-bug-missing-deps@1.0.0: No license field
├─ abbrev@1.0.9
├─ ansi-regex@2.0.0
├─ ansi-styles@2.2.1
├─ anymatch@1.3.0
│  ├─ arrify@^1.0.0
│  └─ micromatch@^2.1.5
├─ aproba@1.0.4
├─ are-we-there-yet@1.1.2
│  ├─ delegates@^1.0.0
│  └─ readable-stream@^2.0.0 || ^1.1.13
├─ arr-diff@2.0.0
│  └─ arr-flatten@^1.0.1
├─ arr-flatten@1.0.1
├─ array-find-index@1.0.2
├─ array-uniq@1.0.3
├─ array-unique@0.2.1
├─ arrify@1.0.1
├─ asn1@0.2.3
├─ assert-plus@0.2.0
├─ async-each@1.0.1
├─ asynckit@0.4.0
├─ aws-sign2@0.6.0
├─ aws4@1.4.1
├─ babel-cli@6.16.0
│  ├─ babel-core@^6.16.0
│  ├─ babel-polyfill@^6.16.0
│  ├─ babel-register@^6.16.0
│  ├─ babel-runtime@^6.9.0
│  ├─ bin-version-check@^2.1.0
│  ├─ chalk@1.1.1
│  ├─ chokidar@^1.0.0
│  ├─ commander@^2.8.1
│  ├─ convert-source-map@^1.1.0
│  ├─ fs-readdir-recursive@^0.1.0
│  ├─ glob@^5.0.5
│  ├─ lodash@^4.2.0
│  ├─ log-symbols@^1.0.2
│  ├─ output-file-sync@^1.1.0
│  ├─ path-exists@^1.0.0
│  ├─ path-is-absolute@^1.0.0
│  ├─ request@^2.65.0
│  ├─ slash@^1.0.0
│  ├─ source-map@^0.5.0
│  └─ v8flags@^2.0.10
├─ babel-code-frame@6.16.0
│  ├─ chalk@^1.1.0
│  ├─ chalk@1.1.3
│  │  ├─ ansi-styles@^2.2.1
│  │  ├─ escape-string-regexp@^1.0.2
│  │  ├─ has-ansi@^2.0.0
│  │  ├─ strip-ansi@^3.0.0
│  │  └─ supports-color@^2.0.0
│  ├─ esutils@^2.0.2
│  └─ js-tokens@^2.0.0
├─ babel-core@6.17.0
│  ├─ babel-code-frame@^6.16.0
│  ├─ babel-generator@^6.17.0
│  ├─ babel-helpers@^6.16.0
│  ├─ babel-messages@^6.8.0
│  ├─ babel-register@^6.16.0
│  ├─ babel-runtime@^6.9.1
│  ├─ babel-template@^6.16.0
│  ├─ babel-traverse@^6.16.0
│  ├─ babel-types@^6.16.0
│  ├─ babylon@^6.11.0
│  ├─ convert-source-map@^1.1.0
│  ├─ debug@^2.1.1
│  ├─ json5@^0.4.0
│  ├─ lodash@^4.2.0
│  ├─ minimatch@^3.0.2
│  ├─ path-exists@^1.0.0
│  ├─ path-is-absolute@^1.0.0
│  ├─ private@^0.1.6
│  ├─ shebang-regex@^1.0.0
│  ├─ slash@^1.0.0
│  └─ source-map@^0.5.0
├─ babel-generator@6.17.0
│  ├─ babel-messages@^6.8.0
│  ├─ babel-runtime@^6.9.0
│  ├─ babel-types@^6.16.0
│  ├─ detect-indent@^3.0.1
│  ├─ jsesc@^1.3.0
│  ├─ lodash@^4.2.0
│  └─ source-map@^0.5.0
├─ babel-helpers@6.16.0
│  ├─ babel-runtime@^6.0.0
│  └─ babel-template@^6.16.0
├─ babel-messages@6.8.0
│  └─ babel-runtime@^6.0.0
├─ babel-polyfill@6.16.0
│  ├─ babel-runtime@^6.9.1
│  ├─ core-js@^2.4.0
│  └─ regenerator-runtime@^0.9.5
├─ babel-register@6.16.3
│  ├─ babel-core@^6.16.0
│  ├─ babel-runtime@^6.11.6
│  ├─ core-js@^2.4.0
│  ├─ home-or-tmp@^1.0.0
│  ├─ lodash@^4.2.0
│  ├─ mkdirp@^0.5.1
│  ├─ path-exists@^1.0.0
│  └─ source-map-support@^0.4.2
├─ babel-runtime@6.11.6
│  ├─ core-js@^2.4.0
│  └─ regenerator-runtime@^0.9.5
├─ babel-template@6.16.0
│  ├─ babel-runtime@^6.9.0
│  ├─ babel-traverse@^6.16.0
│  ├─ babel-types@^6.16.0
│  ├─ babylon@^6.11.0
│  └─ lodash@^4.2.0
├─ babel-traverse@6.16.0
│  ├─ babel-code-frame@^6.16.0
│  ├─ babel-messages@^6.8.0
│  ├─ babel-runtime@^6.9.0
│  ├─ babel-types@^6.16.0
│  ├─ babylon@^6.11.0
│  ├─ debug@^2.2.0
│  ├─ globals@^8.3.0
│  ├─ invariant@^2.2.0
│  └─ lodash@^4.2.0
├─ babel-types@6.16.0
│  ├─ babel-runtime@^6.9.1
│  ├─ esutils@^2.0.2
│  ├─ lodash@^4.2.0
│  └─ to-fast-properties@^1.0.1
├─ babylon@6.11.4
├─ balanced-match@0.4.2
├─ bin-version-check@2.1.0
│  ├─ bin-version@^1.0.0
│  ├─ minimist@^1.1.0
│  ├─ semver-truncate@^1.0.0
│  └─ semver@^4.0.3
├─ bin-version@1.0.4
│  └─ find-versions@^1.0.0
├─ binary-extensions@1.7.0
├─ bl@1.1.2
│  ├─ readable-stream@~2.0.5
│  └─ readable-stream@2.0.6
│  │  ├─ core-util-is@~1.0.0
│  │  ├─ inherits@~2.0.1
│  │  ├─ isarray@~1.0.0
│  │  ├─ process-nextick-args@~1.0.6
│  │  ├─ string_decoder@~0.10.x
│  │  └─ util-deprecate@~1.0.1
├─ block-stream@0.0.9
│  └─ inherits@~2.0.0
├─ boom@2.10.1
│  └─ hoek@2.x.x
├─ brace-expansion@1.1.6
│  ├─ balanced-match@^0.4.1
│  └─ concat-map@0.0.1
├─ braces@1.8.5
│  ├─ expand-range@^1.8.1
│  ├─ preserve@^0.2.0
│  └─ repeat-element@^1.1.2
├─ buffer-shims@1.0.0
├─ builtin-modules@1.1.1
├─ camelcase-keys@2.1.0
│  ├─ camelcase@^2.0.0
│  └─ map-obj@^1.0.0
├─ camelcase@2.1.1
├─ caseless@0.11.0
├─ chalk@1.1.1
│  ├─ ansi-styles@^2.1.0
│  ├─ escape-string-regexp@^1.0.2
│  ├─ has-ansi@^2.0.0
│  ├─ strip-ansi@^3.0.0
│  └─ supports-color@^2.0.0
├─ code-point-at@1.0.1
│  └─ number-is-nan@^1.0.0
├─ combined-stream@1.0.5
│  └─ delayed-stream@~1.0.0
├─ commander@2.9.0
│  └─ graceful-readlink@>= 1.0.0
├─ concat-map@0.0.1
├─ console-control-strings@1.1.0
├─ convert-source-map@1.3.0
├─ core-js@2.4.1
├─ core-util-is@1.0.2
├─ cryptiles@2.0.5
│  └─ boom@2.x.x
├─ currently-unhandled@0.4.1
│  └─ array-find-index@^1.0.1
├─ dashdash@1.14.0
│  ├─ assert-plus@^1.0.0
│  └─ assert-plus@1.0.0
├─ debug@2.2.0
│  └─ ms@0.7.1
├─ decamelize@1.2.0
├─ deep-extend@0.4.1
├─ delayed-stream@1.0.0
├─ delegates@1.0.0
├─ detect-indent@3.0.1
│  ├─ get-stdin@^4.0.1
│  ├─ minimist@^1.1.0
│  └─ repeating@^1.1.0
├─ error-ex@1.3.0
│  └─ is-arrayish@^0.2.1
├─ escape-string-regexp@1.0.5
├─ esutils@2.0.2
├─ expand-brackets@0.1.5
│  └─ is-posix-bracket@^0.1.0
├─ expand-range@1.8.2
│  └─ fill-range@^2.1.0
├─ extend@3.0.0
├─ extglob@0.3.2
│  └─ is-extglob@^1.0.0
├─ extsprintf@1.0.2
├─ filename-regex@2.0.0
├─ fill-range@2.2.3
│  ├─ is-number@^2.1.0
│  ├─ isobject@^2.0.0
│  ├─ randomatic@^1.1.3
│  ├─ repeat-element@^1.1.2
│  └─ repeat-string@^1.5.2
├─ find-up@1.1.2
│  ├─ path-exists@^2.0.0
│  ├─ path-exists@2.1.0
│  │  └─ pinkie-promise@^2.0.0
│  └─ pinkie-promise@^2.0.0
├─ find-versions@1.2.1
│  ├─ array-uniq@^1.0.0
│  ├─ get-stdin@^4.0.1
│  ├─ meow@^3.5.0
│  └─ semver-regex@^1.0.0
├─ for-in@0.1.6
├─ for-own@0.1.4
│  └─ for-in@^0.1.5
├─ forever-agent@0.6.1
├─ form-data@2.0.0
│  ├─ asynckit@^0.4.0
│  ├─ combined-stream@^1.0.5
│  └─ mime-types@^2.1.11
├─ fs-readdir-recursive@0.1.2
├─ fs.realpath@1.0.0
├─ fstream-ignore@1.0.5
│  ├─ fstream@^1.0.0
│  ├─ inherits@2
│  └─ minimatch@^3.0.0
├─ fstream@1.0.10
│  ├─ graceful-fs@^4.1.2
│  ├─ inherits@~2.0.0
│  ├─ mkdirp@>=0.5 0
│  └─ rimraf@2
├─ gauge@2.6.0
│  ├─ aproba@^1.0.3
│  ├─ console-control-strings@^1.0.0
│  ├─ has-color@^0.1.7
│  ├─ has-unicode@^2.0.0
│  ├─ object-assign@^4.1.0
│  ├─ signal-exit@^3.0.0
│  ├─ string-width@^1.0.1
│  ├─ strip-ansi@^3.0.1
│  └─ wide-align@^1.1.0
├─ generate-function@2.0.0
├─ generate-object-property@1.2.0
│  └─ is-property@^1.0.0
├─ get-stdin@4.0.1
├─ getpass@0.1.6
│  ├─ assert-plus@^1.0.0
│  └─ assert-plus@1.0.0
├─ glob-base@0.3.0
│  ├─ glob-parent@^2.0.0
│  └─ is-glob@^2.0.0
├─ glob-parent@2.0.0
│  └─ is-glob@^2.0.0
├─ glob@5.0.15
│  ├─ inflight@^1.0.4
│  ├─ inherits@2
│  ├─ minimatch@2 || 3
│  ├─ once@^1.3.0
│  └─ path-is-absolute@^1.0.0
├─ globals@8.18.0
├─ graceful-fs@4.1.9
├─ graceful-readlink@1.0.1
├─ har-validator@2.0.6
│  ├─ chalk@^1.1.1
│  ├─ chalk@1.1.3
│  │  ├─ ansi-styles@^2.2.1
│  │  ├─ escape-string-regexp@^1.0.2
│  │  ├─ has-ansi@^2.0.0
│  │  ├─ strip-ansi@^3.0.0
│  │  └─ supports-color@^2.0.0
│  ├─ commander@^2.9.0
│  ├─ is-my-json-valid@^2.12.4
│  └─ pinkie-promise@^2.0.0
├─ has-ansi@2.0.0
│  └─ ansi-regex@^2.0.0
├─ has-color@0.1.7
├─ has-unicode@2.0.1
├─ hawk@3.1.3
│  ├─ boom@2.x.x
│  ├─ cryptiles@2.x.x
│  ├─ hoek@2.x.x
│  └─ sntp@1.x.x
├─ hoek@2.16.3
├─ home-or-tmp@1.0.0
│  ├─ os-tmpdir@^1.0.1
│  └─ user-home@^1.1.1
├─ hosted-git-info@2.1.5
├─ http-signature@1.1.1
│  ├─ assert-plus@^0.2.0
│  ├─ jsprim@^1.2.2
│  └─ sshpk@^1.7.0
├─ indent-string@2.1.0
│  ├─ repeating@^2.0.0
│  └─ repeating@2.0.1
│  │  └─ is-finite@^1.0.0
├─ inflight@1.0.5
│  ├─ once@^1.3.0
│  └─ wrappy@1
├─ inherits@2.0.3
├─ ini@1.3.4
├─ invariant@2.2.1
│  └─ loose-envify@^1.0.0
├─ is-arrayish@0.2.1
├─ is-binary-path@1.0.1
│  └─ binary-extensions@^1.0.0
├─ is-buffer@1.1.4
├─ is-builtin-module@1.0.0
│  └─ builtin-modules@^1.0.0
├─ is-dotfile@1.0.2
├─ is-equal-shallow@0.1.3
│  └─ is-primitive@^2.0.0
├─ is-extendable@0.1.1
├─ is-extglob@1.0.0
├─ is-finite@1.0.2
│  └─ number-is-nan@^1.0.0
├─ is-fullwidth-code-point@1.0.0
│  └─ number-is-nan@^1.0.0
├─ is-glob@2.0.1
│  └─ is-extglob@^1.0.0
├─ is-my-json-valid@2.15.0
│  ├─ generate-function@^2.0.0
│  ├─ generate-object-property@^1.1.0
│  ├─ jsonpointer@^4.0.0
│  └─ xtend@^4.0.0
├─ is-number@2.1.0
│  └─ kind-of@^3.0.2
├─ is-posix-bracket@0.1.1
├─ is-primitive@2.0.0
├─ is-property@1.0.2
├─ is-typedarray@1.0.0
├─ is-utf8@0.2.1
├─ isarray@1.0.0
├─ isobject@2.1.0
│  └─ isarray@1.0.0
├─ isstream@0.1.2
├─ js-tokens@2.0.0
├─ jsesc@1.3.0
├─ json-schema@0.2.3
├─ json-stringify-safe@5.0.1
├─ json5@0.4.0
├─ jsonpointer@4.0.0
├─ jsprim@1.3.1
│  ├─ extsprintf@1.0.2
│  ├─ json-schema@0.2.3
│  └─ verror@1.3.6
├─ kind-of@3.0.4
│  └─ is-buffer@^1.0.2
├─ load-json-file@1.1.0
│  ├─ graceful-fs@^4.1.2
│  ├─ parse-json@^2.2.0
│  ├─ pify@^2.0.0
│  ├─ pinkie-promise@^2.0.0
│  └─ strip-bom@^2.0.0
├─ lodash@4.16.4
├─ log-symbols@1.0.2
│  ├─ chalk@^1.0.0
│  └─ chalk@1.1.3
│  │  ├─ ansi-styles@^2.2.1
│  │  ├─ escape-string-regexp@^1.0.2
│  │  ├─ has-ansi@^2.0.0
│  │  ├─ strip-ansi@^3.0.0
│  │  └─ supports-color@^2.0.0
├─ loose-envify@1.2.0
│  ├─ js-tokens@^1.0.1
│  └─ js-tokens@1.0.3
├─ loud-rejection@1.6.0
│  ├─ currently-unhandled@^0.4.1
│  └─ signal-exit@^3.0.0
├─ map-obj@1.0.1
├─ meow@3.7.0
│  ├─ camelcase-keys@^2.0.0
│  ├─ decamelize@^1.1.2
│  ├─ loud-rejection@^1.0.0
│  ├─ map-obj@^1.0.1
│  ├─ minimist@^1.1.3
│  ├─ normalize-package-data@^2.3.4
│  ├─ object-assign@^4.0.1
│  ├─ read-pkg-up@^1.0.1
│  ├─ redent@^1.0.0
│  └─ trim-newlines@^1.0.0
├─ micromatch@2.3.11
│  ├─ arr-diff@^2.0.0
│  ├─ array-unique@^0.2.1
│  ├─ braces@^1.8.2
│  ├─ expand-brackets@^0.1.4
│  ├─ extglob@^0.3.1
│  ├─ filename-regex@^2.0.0
│  ├─ is-extglob@^1.0.0
│  ├─ is-glob@^2.0.1
│  ├─ kind-of@^3.0.2
│  ├─ normalize-path@^2.0.1
│  ├─ object.omit@^2.0.0
│  ├─ parse-glob@^3.0.4
│  └─ regex-cache@^0.4.2
├─ mime-db@1.24.0
├─ mime-types@2.1.12
│  └─ mime-db@~1.24.0
├─ minimatch@3.0.3
│  └─ brace-expansion@^1.0.0
├─ minimist@1.2.0
├─ mkdirp@0.5.1
│  ├─ minimist@0.0.8
│  └─ minimist@0.0.8
├─ ms@0.7.1
├─ nan@2.4.0
├─ node-pre-gyp@0.6.30
│  ├─ mkdirp@~0.5.0
│  ├─ nopt@~3.0.1
│  ├─ npmlog@4.x
│  ├─ rc@~1.1.0
│  ├─ request@2.x
│  ├─ rimraf@~2.5.0
│  ├─ semver@~5.3.0
│  ├─ semver@5.3.0
│  ├─ tar-pack@~3.1.0
│  └─ tar@~2.2.0
├─ node-uuid@1.4.7
├─ nopt@3.0.6
│  └─ abbrev@1
├─ normalize-package-data@2.3.5
│  ├─ hosted-git-info@^2.1.4
│  ├─ is-builtin-module@^1.0.0
│  ├─ semver@2 || 3 || 4 || 5
│  ├─ semver@5.3.0
│  └─ validate-npm-package-license@^3.0.1
├─ normalize-path@2.0.1
├─ npmlog@4.0.0
│  ├─ are-we-there-yet@~1.1.2
│  ├─ console-control-strings@~1.1.0
│  ├─ gauge@~2.6.0
│  └─ set-blocking@~2.0.0
├─ number-is-nan@1.0.1
├─ oauth-sign@0.8.2
├─ object-assign@4.1.0
├─ object.omit@2.0.0
│  ├─ for-own@^0.1.3
│  └─ is-extendable@^0.1.1
├─ once@1.4.0
│  └─ wrappy@1
├─ os-tmpdir@1.0.2
├─ output-file-sync@1.1.2
│  ├─ graceful-fs@^4.1.4
│  ├─ mkdirp@^0.5.1
│  └─ object-assign@^4.1.0
├─ parse-glob@3.0.4
│  ├─ glob-base@^0.3.0
│  ├─ is-dotfile@^1.0.0
│  ├─ is-extglob@^1.0.0
│  └─ is-glob@^2.0.0
├─ parse-json@2.2.0
│  └─ error-ex@^1.2.0
├─ path-exists@1.0.0
├─ path-is-absolute@1.0.1
├─ path-type@1.1.0
│  ├─ graceful-fs@^4.1.2
│  ├─ pify@^2.0.0
│  └─ pinkie-promise@^2.0.0
├─ pify@2.3.0
├─ pinkie-promise@2.0.1
│  └─ pinkie@^2.0.0
├─ pinkie@2.0.4
├─ preserve@0.2.0
├─ private@0.1.6
├─ process-nextick-args@1.0.7
├─ qs@6.2.1
├─ randomatic@1.1.5
│  ├─ is-number@^2.0.2
│  └─ kind-of@^3.0.2
├─ rc@1.1.6
│  ├─ deep-extend@~0.4.0
│  ├─ ini@~1.3.0
│  ├─ minimist@^1.2.0
│  └─ strip-json-comments@~1.0.4
├─ read-pkg-up@1.0.1
│  ├─ find-up@^1.0.0
│  └─ read-pkg@^1.0.0
├─ read-pkg@1.1.0
│  ├─ load-json-file@^1.0.0
│  ├─ normalize-package-data@^2.3.2
│  └─ path-type@^1.0.0
├─ readable-stream@2.1.5
│  ├─ buffer-shims@^1.0.0
│  ├─ core-util-is@~1.0.0
│  ├─ inherits@~2.0.1
│  ├─ isarray@~1.0.0
│  ├─ process-nextick-args@~1.0.6
│  ├─ string_decoder@~0.10.x
│  └─ util-deprecate@~1.0.1
├─ readdirp@2.1.0
│  ├─ graceful-fs@^4.1.2
│  ├─ minimatch@^3.0.2
│  ├─ readable-stream@^2.0.2
│  └─ set-immediate-shim@^1.0.1
├─ redent@1.0.0
│  ├─ indent-string@^2.1.0
│  └─ strip-indent@^1.0.1
├─ regenerator-runtime@0.9.5
├─ regex-cache@0.4.3
│  ├─ is-equal-shallow@^0.1.3
│  └─ is-primitive@^2.0.0
├─ repeat-element@1.1.2
├─ repeat-string@1.5.4
├─ repeating@1.1.3
│  └─ is-finite@^1.0.0
├─ request@2.75.0
│  ├─ aws-sign2@~0.6.0
│  ├─ aws4@^1.2.1
│  ├─ bl@~1.1.2
│  ├─ caseless@~0.11.0
│  ├─ combined-stream@~1.0.5
│  ├─ extend@~3.0.0
│  ├─ forever-agent@~0.6.1
│  ├─ form-data@~2.0.0
│  ├─ har-validator@~2.0.6
│  ├─ hawk@~3.1.3
│  ├─ http-signature@~1.1.0
│  ├─ is-typedarray@~1.0.0
│  ├─ isstream@~0.1.2
│  ├─ json-stringify-safe@~5.0.1
│  ├─ mime-types@~2.1.7
│  ├─ node-uuid@~1.4.7
│  ├─ oauth-sign@~0.8.1
│  ├─ qs@~6.2.0
│  ├─ stringstream@~0.0.4
│  ├─ tough-cookie@~2.3.0
│  └─ tunnel-agent@~0.4.1
├─ rimraf@2.5.4
│  ├─ glob@^7.0.5
│  └─ glob@7.1.1
│  │  ├─ fs.realpath@^1.0.0
│  │  ├─ inflight@^1.0.4
│  │  ├─ inherits@2
│  │  ├─ minimatch@^3.0.2
│  │  ├─ once@^1.3.0
│  │  └─ path-is-absolute@^1.0.0
├─ semver-regex@1.0.0
├─ semver-truncate@1.1.2
│  ├─ semver@^5.3.0
│  └─ semver@5.3.0
├─ semver@4.3.6
├─ set-blocking@2.0.0
├─ set-immediate-shim@1.0.1
├─ shebang-regex@1.0.0
├─ signal-exit@3.0.1
├─ slash@1.0.0
├─ sntp@1.0.9
│  └─ hoek@2.x.x
├─ source-map-support@0.4.3
│  └─ source-map@^0.5.3
├─ source-map@0.5.6
├─ spdx-correct@1.0.2
│  └─ spdx-license-ids@^1.0.2
├─ spdx-expression-parse@1.0.4
├─ spdx-license-ids@1.2.2
├─ sshpk@1.10.1
│  ├─ asn1@~0.2.3
│  ├─ assert-plus@^1.0.0
│  ├─ assert-plus@1.0.0
│  ├─ bcrypt-pbkdf@^1.0.0
│  ├─ dashdash@^1.12.0
│  ├─ ecc-jsbn@~0.1.1
│  ├─ getpass@^0.1.1
│  ├─ jodid25519@^1.0.0
│  ├─ jsbn@~0.1.0
│  └─ tweetnacl@~0.14.0
├─ string_decoder@0.10.31
├─ string-width@1.0.2
│  ├─ code-point-at@^1.0.0
│  ├─ is-fullwidth-code-point@^1.0.0
│  └─ strip-ansi@^3.0.0
├─ stringstream@0.0.5
├─ strip-ansi@3.0.1
│  └─ ansi-regex@^2.0.0
├─ strip-bom@2.0.0
│  └─ is-utf8@^0.2.0
├─ strip-indent@1.0.1
│  └─ get-stdin@^4.0.1
├─ strip-json-comments@1.0.4
├─ supports-color@2.0.0
├─ tar-pack@3.1.4
│  ├─ debug@~2.2.0
│  ├─ fstream-ignore@~1.0.5
│  ├─ fstream@~1.0.10
│  ├─ once@~1.3.3
│  ├─ once@1.3.3
│  │  └─ wrappy@1
│  ├─ readable-stream@~2.1.4
│  ├─ rimraf@~2.5.1
│  ├─ tar@~2.2.1
│  └─ uid-number@~0.0.6
├─ tar@2.2.1
│  ├─ block-stream@*
│  ├─ fstream@^1.0.2
│  └─ inherits@2
├─ to-fast-properties@1.0.2
├─ tough-cookie@2.3.1
├─ trim-newlines@1.0.0
├─ tunnel-agent@0.4.3
├─ tweetnacl@0.14.3
├─ uid-number@0.0.6
├─ user-home@1.1.1
├─ util-deprecate@1.0.2
├─ v8flags@2.0.11
│  └─ user-home@^1.1.1
├─ validate-npm-package-license@3.0.1
│  ├─ spdx-correct@~1.0.0
│  └─ spdx-expression-parse@~1.0.0
├─ verror@1.3.6
│  └─ extsprintf@1.0.2
├─ wide-align@1.1.0
│  └─ string-width@^1.0.1
├─ wrappy@1.0.2
└─ xtend@4.0.1

[sairion]

And this is output of npm ls which shows a few deps are not matching:

yarnjs-bug-missing-deps@1.0.0 /Users/user/yarnjs-bug-missing-deps
├── anymatch@1.3.0 extraneous
├── async-each@1.0.1 extraneous
├─┬ babel-cli@6.16.0
│ ├─┬ babel-core@6.17.0
│ │ ├─┬ babel-code-frame@6.16.0
│ │ │ ├── chalk@1.1.3
│ │ │ ├── esutils@2.0.2
│ │ │ └── js-tokens@2.0.0
│ │ ├─┬ babel-generator@6.17.0
│ │ │ ├─┬ detect-indent@3.0.1
│ │ │ │ ├── get-stdin@4.0.1
│ │ │ │ └─┬ repeating@1.1.3
│ │ │ │   └─┬ is-finite@1.0.2
│ │ │ │     └── number-is-nan@1.0.1
│ │ │ └── jsesc@1.3.0
│ │ ├── babel-helpers@6.16.0
│ │ ├── babel-messages@6.8.0
│ │ ├── babel-template@6.16.0
│ │ ├─┬ babel-traverse@6.16.0
│ │ │ ├── globals@8.18.0
│ │ │ └─┬ invariant@2.2.1
│ │ │   └─┬ loose-envify@1.2.0
│ │ │     └── js-tokens@1.0.3
│ │ ├─┬ babel-types@6.16.0
│ │ │ └── to-fast-properties@1.0.2
│ │ ├── babylon@6.11.4
│ │ ├─┬ debug@2.2.0
│ │ │ └── ms@0.7.1
│ │ ├── json5@0.4.0
│ │ ├─┬ minimatch@3.0.3
│ │ │ └─┬ brace-expansion@1.1.6
│ │ │   ├── balanced-match@0.4.2
│ │ │   └── concat-map@0.0.1
│ │ ├── private@0.1.6
│ │ └── shebang-regex@1.0.0
│ ├─┬ babel-polyfill@6.16.0
│ │ ├── core-js@2.4.1
│ │ └── regenerator-runtime@0.9.5
│ ├─┬ babel-register@6.16.3
│ │ ├─┬ home-or-tmp@1.0.0
│ │ │ └── os-tmpdir@1.0.2
│ │ ├─┬ mkdirp@0.5.1
│ │ │ └── minimist@0.0.8
│ │ └── source-map-support@0.4.3
│ ├── babel-runtime@6.11.6
│ ├─┬ bin-version-check@2.1.0
│ │ ├─┬ bin-version@1.0.4
│ │ │ └─┬ find-versions@1.2.1
│ │ │   ├── array-uniq@1.0.3
│ │ │   ├─┬ meow@3.7.0
│ │ │   │ ├─┬ camelcase-keys@2.1.0
│ │ │   │ │ └── camelcase@2.1.1
│ │ │   │ ├── decamelize@1.2.0
│ │ │   │ ├─┬ loud-rejection@1.6.0
│ │ │   │ │ ├─┬ currently-unhandled@0.4.1
│ │ │   │ │ │ └── array-find-index@1.0.2
│ │ │   │ │ └── signal-exit@3.0.1
│ │ │   │ ├── map-obj@1.0.1
│ │ │   │ ├─┬ normalize-package-data@2.3.5
│ │ │   │ │ ├── hosted-git-info@2.1.5
│ │ │   │ │ ├─┬ is-builtin-module@1.0.0
│ │ │   │ │ │ └── builtin-modules@1.1.1
│ │ │   │ │ ├── semver@5.3.0
│ │ │   │ │ └─┬ validate-npm-package-license@3.0.1
│ │ │   │ │   ├─┬ spdx-correct@1.0.2
│ │ │   │ │   │ └── spdx-license-ids@1.2.2
│ │ │   │ │   └── spdx-expression-parse@1.0.4
│ │ │   │ ├─┬ read-pkg-up@1.0.1
│ │ │   │ │ ├─┬ find-up@1.1.2
│ │ │   │ │ │ └── path-exists@2.1.0
│ │ │   │ │ └─┬ read-pkg@1.1.0
│ │ │   │ │   ├─┬ load-json-file@1.1.0
│ │ │   │ │   │ ├─┬ parse-json@2.2.0
│ │ │   │ │   │ │ └─┬ error-ex@1.3.0
│ │ │   │ │   │ │   └── is-arrayish@0.2.1
│ │ │   │ │   │ ├── pify@2.3.0
│ │ │   │ │   │ └─┬ strip-bom@2.0.0
│ │ │   │ │   │   └── is-utf8@0.2.1
│ │ │   │ │   └── path-type@1.1.0
│ │ │   │ ├─┬ redent@1.0.0
│ │ │   │ │ ├─┬ indent-string@2.1.0
│ │ │   │ │ │ └── repeating@2.0.1
│ │ │   │ │ └── strip-indent@1.0.1
│ │ │   │ └── trim-newlines@1.0.0
│ │ │   └── semver-regex@1.0.0
│ │ ├── minimist@1.2.0
│ │ ├── semver@4.3.6
│ │ └─┬ semver-truncate@1.1.2
│ │   └── semver@5.3.0
│ ├─┬ chalk@1.1.1
│ │ ├── ansi-styles@2.2.1
│ │ ├── escape-string-regexp@1.0.5
│ │ ├─┬ has-ansi@2.0.0
│ │ │ └── ansi-regex@2.0.0
│ │ ├── strip-ansi@3.0.1
│ │ └── supports-color@2.0.0
│ ├── UNMET OPTIONAL DEPENDENCY chokidar@^1.0.0
│ ├─┬ commander@2.9.0
│ │ └── graceful-readlink@1.0.1
│ ├── convert-source-map@1.3.0
│ ├── fs-readdir-recursive@0.1.2
│ ├─┬ glob@5.0.15
│ │ ├─┬ inflight@1.0.5
│ │ │ └── wrappy@1.0.2
│ │ ├── inherits@2.0.3
│ │ └── once@1.4.0
│ ├── lodash@4.16.4
│ ├─┬ log-symbols@1.0.2
│ │ └── chalk@1.1.3
│ ├─┬ output-file-sync@1.1.2
│ │ ├── graceful-fs@4.1.9
│ │ └── object-assign@4.1.0
│ ├── path-exists@1.0.0
│ ├── path-is-absolute@1.0.1
│ ├─┬ request@2.75.0
│ │ ├── aws-sign2@0.6.0
│ │ ├── aws4@1.4.1
│ │ ├─┬ bl@1.1.2
│ │ │ └─┬ readable-stream@2.0.6
│ │ │   ├── core-util-is@1.0.2
│ │ │   ├── isarray@1.0.0
│ │ │   ├── process-nextick-args@1.0.7
│ │ │   ├── string_decoder@0.10.31
│ │ │   └── util-deprecate@1.0.2
│ │ ├── caseless@0.11.0
│ │ ├─┬ combined-stream@1.0.5
│ │ │ └── delayed-stream@1.0.0
│ │ ├── extend@3.0.0
│ │ ├── forever-agent@0.6.1
│ │ ├─┬ form-data@2.0.0
│ │ │ └── asynckit@0.4.0
│ │ ├─┬ har-validator@2.0.6
│ │ │ ├── chalk@1.1.3
│ │ │ ├─┬ is-my-json-valid@2.15.0
│ │ │ │ ├── generate-function@2.0.0
│ │ │ │ ├─┬ generate-object-property@1.2.0
│ │ │ │ │ └── is-property@1.0.2
│ │ │ │ ├── jsonpointer@4.0.0
│ │ │ │ └── xtend@4.0.1
│ │ │ └─┬ pinkie-promise@2.0.1
│ │ │   └── pinkie@2.0.4
│ │ ├─┬ hawk@3.1.3
│ │ │ ├── boom@2.10.1
│ │ │ ├── cryptiles@2.0.5
│ │ │ ├── hoek@2.16.3
│ │ │ └── sntp@1.0.9
│ │ ├─┬ http-signature@1.1.1
│ │ │ ├── assert-plus@0.2.0
│ │ │ ├─┬ jsprim@1.3.1
│ │ │ │ ├── extsprintf@1.0.2
│ │ │ │ ├── json-schema@0.2.3
│ │ │ │ └── verror@1.3.6
│ │ │ └─┬ sshpk@1.10.1
│ │ │   ├── asn1@0.2.3
│ │ │   ├── assert-plus@1.0.0
│ │ │   ├── UNMET OPTIONAL DEPENDENCY bcrypt-pbkdf@^1.0.0
│ │ │   ├─┬ dashdash@1.14.0
│ │ │   │ └── assert-plus@1.0.0
│ │ │   ├── UNMET OPTIONAL DEPENDENCY ecc-jsbn@~0.1.1
│ │ │   ├─┬ getpass@0.1.6
│ │ │   │ └── assert-plus@1.0.0
│ │ │   ├── UNMET OPTIONAL DEPENDENCY jodid25519@^1.0.0
│ │ │   ├── UNMET OPTIONAL DEPENDENCY jsbn@~0.1.0
│ │ │   └── tweetnacl@0.14.3
│ │ ├── is-typedarray@1.0.0
│ │ ├── isstream@0.1.2
│ │ ├── json-stringify-safe@5.0.1
│ │ ├─┬ mime-types@2.1.12
│ │ │ └── mime-db@1.24.0
│ │ ├── node-uuid@1.4.7
│ │ ├── oauth-sign@0.8.2
│ │ ├── qs@6.2.1
│ │ ├── stringstream@0.0.5
│ │ ├── tough-cookie@2.3.1
│ │ └── tunnel-agent@0.4.3
│ ├── slash@1.0.0
│ ├── source-map@0.5.6
│ └─┬ v8flags@2.0.11
│   └── user-home@1.1.1
├── is-binary-path@1.0.1 extraneous
├── nan@2.4.0 extraneous
├── node-pre-gyp@0.6.30 extraneous
└── readdirp@2.1.0 extraneous

[truckingsim]

can confirm the same issue on a project with more packages. chokidar gets installed as a dependency of babel-cli and in my case also as a dependency of nunjucks. But chokidar does not show up on yarn ls under watchpack (which webpack depends on).

I get the same behavior running both yarn and yarn --flatten

edit: Also forgot to add this is on

[wavded]

I'm getting a similar issue with graceful-fs across a couple projects where it doesn't get installed.

Error: Cannot find module 'graceful-fs'
    at Function.Module._resolveFilename (module.js:455:15)
    at Function.Module._load (module.js:403:25)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/wavded/Projects/fwwa/node_modules/enhanced-resolve/lib/NodeJsInputFileSystem.js:5:10)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
error Command failed with exit code 1.

[istarkov]

As a quik fix yarn add --dev chokidar && yarn add --optional fsevents solves webpack watch for me

[TheLarkInn]

cc @TheLarkInn @bebraw @sokra @SpaceK33z to track this.

[janv]

I ran into the same issue.
After switching from npm to yarn, webpack was using 50% CPU.
Figured that fsevent wasn't used correctly/found by webpack(chokidar) anymore (although the package.json has no been touched when switching to yarn), so I added it as a dev dependency to my app.

• Curiously, yarn install --production would also try to install fsevent. Since the server is linux, this fails.
• fsevent is both a devDependency of my app and a transitive dependency of webpack -> watchpack -> chokidar
• Different from the OP, chokidar was present in my node_modules

[outdooricon]

I had same experience as OP, chokidar is missing from node_modules but present in the lock

[TylerShin]

+1 with chokidar package

[hownowbrowncow]

I'm experiencing the same issue trying to work on https://github.com/hownowbrowncow/material-timepicker so if you want something to test against there is that. Running gulp will fail when watchify cannot find chokidar.

Let me know what else I can provide to help with the issue.

[istarkov]

I also found some problems with fsevents library, having the solution above
yarn add --dev chokidar && yarn add --optional fsevents.

After clean install

rm -rf node_modules
yarn

I does not see fsevents folder under node_modules even fsevents exists inside package.json as optional dependency

  "optionalDependencies": {
    "fsevents": "^1.0.14"
  }

So node takes 100+% cpu as chokidar starts to use polling instead of fs events.

But if I run yarn add --optional fsevents after yarn command, I see the fsevents folder under the node_modules and all cpu problems gone.

[thecommandline]

Same problem but with graceful-fs. I can use the resolved URL in the yarn.lock file to successfully download and extract it into node_modules manually.

[ffigiel]

Not sure if it's related, but I'm getting same problems just when running yarn --production