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[Bug] yarn pack packs hidden files that shouldn't be there

See original GitHub issue

I’d be willing to implement a fix

Describe the bug

yarn pack packs hidden files (in my case, .babelrc) files that should not be included.

package.json:

{
  "name": "react-fit",
  "version": "1.3.1",
  …
  "main": "dist/umd/Fit.js",
  "module": "dist/esm/Fit.js",
  "source": "src/Fit.jsx",
  "scripts": {
    "build": "yarn build-js-all",
    "build-js-all": "yarn build-js-esm && yarn build-js-umd",
    "build-js-esm": "cross-env BABEL_ENV=production-esm babel src -d dist/esm --ignore \"**/*.spec.js,**/*.spec.jsx\"",
    "build-js-umd": "cross-env BABEL_ENV=production-umd babel src -d dist/umd --ignore \"**/*.spec.js,**/*.spec.jsx\"",
    "clean": "rimraf dist",
    "lint": "eslint src/ test/ --ext .jsx,.js",
    "prepublishOnly": "yarn clean && yarn build",
    "test": "yarn lint"
  },
  …
  "files": [
    ".babelrc",
    "LICENSE",
    "README.md",
    "dist/",
    "src/"
  ],
  …
}

Note files that does not include test directory.

yarn pack output:

wojciech.maj@WS-C02XL2MTJHD2 react-fit % yarn pack
➤ YN0000: .babelrc
➤ YN0000: LICENSE
➤ YN0000: README.md
➤ YN0000: dist/esm/Fit.js
➤ YN0000: dist/esm/shared/utils.js
➤ YN0000: dist/umd/Fit.js
➤ YN0000: dist/umd/shared/utils.js
➤ YN0000: package.json
➤ YN0000: src/Fit.jsx
➤ YN0000: src/shared/utils.js
➤ YN0000: test/.babelrc
➤ YN0000: Package archive generated in /Users/wojciech.maj/Projekty/GitHub projects/react-fit/package.tgz
➤ YN0000: Done in 0.49s

Note how test/.babelrc was added to the package.

```npm pack` output:

wojciech.maj@WS-C02XL2MTJHD2 react-fit % npm pack
npm notice 
npm notice 📦  react-fit@1.3.1
npm notice === Tarball Contents === 
npm notice 332B   .babelrc                
npm notice 1.1kB  LICENSE                 
npm notice 15.0kB dist/esm/Fit.js         
npm notice 16.5kB dist/umd/Fit.js         
npm notice 763B   dist/esm/shared/utils.js
npm notice 950B   dist/umd/shared/utils.js
npm notice 367B   src/shared/utils.js     
npm notice 1.9kB  package.json            
npm notice 8.6kB  src/Fit.jsx             
npm notice 5.6kB  README.md               
npm notice === Tarball Details === 
npm notice name:          react-fit                               
npm notice version:       1.3.1                                   
npm notice filename:      react-fit-1.3.1.tgz                     
npm notice package size:  9.5 kB                                  
npm notice unpacked size: 51.0 kB                                 
npm notice shasum:        850cb5d554fdfa4b27891f62a9d290d3e7eda57b
npm notice integrity:     sha512-MmVk/SXyVbxiz[...]YKNBLpbK/aI1w==
npm notice total files:   10                                      
npm notice 
react-fit-1.3.1.tgz

Note how test/.babelrc was not added to the package.

To Reproduce

https://github.com/wojtekmaj/react-fit run npm pack and then yarn pack, compare.

Screenshots

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Environment if relevant (please complete the following information):