Yarn: Install generates warnings: The case-insensitive file shouldn't be copied twice in one bulk copy

[artlogic]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When installing with cordova as a dependency, I receive lots of warnings in the form of: warning The case-insensitive file /Users/artlogic/Code/random/yarn-issue/node_modules/npm/node_modules/readable-stream/lib/internal/streams/BufferList.js shouldn't be copied twice in one bulk copy

These files all seem to be related to npm.

If the current behavior is a bug, please provide the steps to reproduce.
Create a simple package.json with cordova as a dependency:

{
  "name": "yarn-issue",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "cordova": "^7.0.1"
  }
}

Run yarn install.

See a lot of warnings that look like this: warning The case-insensitive file /Users/artlogic/Code/random/yarn-issue/node_modules/npm/node_modules/readable-stream/lib/internal/streams/BufferList.js shouldn't be copied twice in one bulk copy

What is the expected behavior?
I don't expect to see all these error messages - they were not appearing before.

Please mention your node.js, yarn and operating system version.
Node 6.11.3, Yarn 1.0.1, Mac OS 10.11.6

[OmgImAlexis]

Same issue here. I wasn't getting this until one of the last few yarn updates but I'm also getting it for other packages.

warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/CHANGELOG.md shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/LICENSE shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/README.md shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/appveyor.yml shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/bin shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/package.json shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/.npmignore shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/.travis.yml shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/LICENSE shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/README.md shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/bin shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/examples shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/lib shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/package.json shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/test shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/bin/node-pre-gyp shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/bin/node-pre-gyp.cmd shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/build.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/clean.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/configure.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/info.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/install.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/node-pre-gyp.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/package.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/pre-binding.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/publish.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/rebuild.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/reinstall.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/reveal.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/testbinary.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/testpackage.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/unpublish.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/bin/nopt.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/examples/my-program.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/lib/nopt.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/nopt/test/basic.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/abi_crosswalk.json shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/compile.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/handle_gyp_opts.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/nw-pre-gyp shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/s3_setup.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/versioning.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/nw-pre-gyp/index.html shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/.config/yarn/global/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/nw-pre-gyp/package.json shouldn't be copied twice in one bulk copy

warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules/md5-hex shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules/md5-hex/browser.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules/md5-hex/index.js shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules/md5-hex/license shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules/md5-hex/package.json shouldn't be copied twice in one bulk copy
warning The case-insensitive file /Users/xo/code/@lad/logger/node_modules/nyc/node_modules/md5-hex/readme.md shouldn't be copied twice in one bulk copy

[adamreisnz]

Also happening for the serialport package. What is the reason for this warning?

[OmgImAlexis]

Seems this is happening with more and more packages as I update my deps.

[BYK]

Duplicate of #3751.

[aichholzer]

Yep, same here.

[AnthoniG]

Likewise I am getting it for all packages in my package.json.
Did not happen on previous versions of yarn, so why now ?

Here is my package.json :-
{ "name": "leadfinderlocal", "version": "3.3.0", "private": true, "proxy": "http://localhost", "dependencies": { "async": "^2.5.0", "axios": "^0.16.2", "classnames": "^2.2.5", "google-maps": "^3.2.1", "lodash": "^4.17.4", "mobx": "^3.2.2", "mobx-react": "^4.2.2", "mobx-react-devtools": "^4.2.15", "mobx-react-router": "^4.0.1", "moment": "^2.18.1", "object-hash": "^1.1.8", "prop-types": "^15.5.10", "react": "^15.6.1", "react-dom": "^15.6.1", "react-dropzone": "^3.13.1", "react-modal": "^1.7.7", "react-router": "^4.2.0", "react-router-dom": "^4.2.2", "react-scripts-ts": "^2.6.0", "react-transition-group": "1.2.0", "reactstrap": "^4.8.0", "safe-eval": "^0.3.0", "scriptjs": "^2.5.8" }, "devDependencies": { "@types/google-maps": "^3.2.0", "@types/scriptjs": "^0.0.2", "@types/classnames": "^2.2.3", "@types/lodash": "^4.14.74", "@types/moment": "^2.13.0", "@types/node": "^8.0.26", "@types/object-hash": "^0.5.29", "@types/prop-types": "^15.5.1", "@types/react": "^16.0.5", "@types/react-dom": "^15.5.4", "@types/react-dropzone": "^0.0.32", "@types/react-modal": "^1.6.6", "@types/react-router": "^4.0.15", "@types/react-router-dom": "^4.0.7", "@types/reactstrap": "^4.3.13", "concurrently": "^3.5.0", "node-sass-chokidar": "^0.0.3", "npm": "^5.3.0" }, "scripts": { "start-ts": "set PORT=4000 && concurrently \"react-scripts-ts start\" ", "start": "set PORT=4000 && concurrently \"npm run watch-css\" \"react-scripts-ts start\"", "build": "npm run build-css && react-scripts-ts build", "build-css": "node-sass-chokidar src/styles/scss -o src/styles/css", "build-scripts": "react-scripts-ts build", "watch-css": "npm run build-css && node-sass-chokidar src/styles/scss -o src/styles/css --watch --recursive" } }

[aichholzer]

And back to npm I go...
👍

[RafaPolit]

Same problem here, really annoying, this message appears about 20 times in our install. In our project, it appears to all be linked to the nyc package, but there are dozens of packages in our flow that use NYC.

[aaronatmycujoo]

I can't tell which package this is coming from, it just appeared after upgrading yarn to v1

[hmtri1011]

Same problem here :( so any solutions for resolving this annoy warning :(

[BYK]

We have merged a patch that silences this warning. If you are interested you can try getting the latest nightly: https://yarnpkg.com/en/docs/nightly

[bajras]

Any update on this fix? I tried using nightly and still get those warning? Thanks.

[IAMtheIAM]

the yarn owner said they're working on it