[avoidwork]

Summary

When the precision option is set, the value is a string from toPrecision(), and toLocaleString() on a string is a no-op — so the locale's decimal separator was ignored. filesize(1234, { locale: "sv", precision: 2 }) returned 1.2 kB instead of 1,2 kB.

The fix coerces the string back to a number before locale formatting (only for non-zero values, so zero precision like 0.00 is retained), letting the locale formatter apply its decimal separator.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature / enhancement
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Build / dependency / tooling change
• Test additions or updates
• Other

Related Issues

fixes #373

Testing

npm test passes (272 tests, 100% coverage). npm run build succeeds. Added a regression test covering sv, de-DE, en-US, precision 3, and negative values.

Checklist

• npm test passes
• npm run build succeeds
• 100% test coverage maintained
• No hardcoded secrets or credentials introduced
• Zero external dependencies added
• ES Modules only (no CommonJS in src/)
• JSDoc comments added/updated
• CHANGELOG.md updated (if applicable)

Screenshots (if applicable)

N/A