How to fix warning: ignoring invalid gitattributes pattern in Git

# View your .gitattributes file
cat .gitattributes

# Or use git check-attr to debug specific files
git check-attr -a path/to/file.txt

# ❌ Invalid - brace expansion not supported
*.{js,ts} text eol=lf

# ✅ Valid - separate lines for each pattern
*.js text eol=lf
*.ts text eol=lf

# ❌ Invalid - trailing slash is pointless in .gitattributes
docs/ linguist-documentation

# ✅ Valid - use /** for recursive directory matching
docs/** linguist-documentation

# ✅ Also valid - match all files in docs and subdirectories
docs/* linguist-documentation

# ❌ Invalid - negative patterns not allowed
*.log text
!important.log

# ✅ Valid - use explicit patterns for exceptions
*.log text
important.log binary

# Check attributes for specific files
git check-attr -a src/app.js
git check-attr text src/app.js

# Check multiple files
git check-attr -a src/*.js

# Verbose output showing which .gitattributes line matched
git check-attr -v text src/app.js

# Remove all files from the index
git rm --cached -r .

# Re-add all files (applies new attributes)
git add .

# Check what changed
git diff --cached

# Commit the attribute changes
git commit -m "Fix .gitattributes patterns and re-normalize files"