Browserslist Validator

Validate .browserslistrc files and browserslist entries in package.json for syntax errors, deprecated browsers, redundant queries, and best practices.

Commands

# Full validation (all rules)
python3 scripts/browserslist_validator.py validate .browserslistrc

# Validate browserslist in package.json
python3 scripts/browserslist_validator.py validate package.json

# Quick syntax-only check
python3 scripts/browserslist_validator.py check .browserslistrc

# Estimate coverage
python3 scripts/browserslist_validator.py coverage .browserslistrc