SKILL.md
Dart Best Practices
1. When to use this skill
Use this skill when:
- Writing or reviewing Dart code.
- Looking for guidance on idiomatic Dart usage.
2. Best Practices
Multi-line Strings
Prefer using multi-line strings (''') over concatenating strings with + and
\n, especially for large blocks of text like SQL queries, HTML, or
PEM-encoded keys. This improves readability and avoids
lines_longer_than_80_chars lint errors by allowing natural line breaks.
Avoid:
final pem = '-----BEGIN RSA PRIVATE KEY-----\n' +
base64Encode(fullBytes) +
'\n-----END RSA PRIVATE KEY-----';Prefer:
final pem = '''
-----BEGIN RSA PRIVATE KEY-----
${base64Encode(fullBytes)}
-----END RSA PRIVATE KEY-----''';Line Length
Avoid lines longer than 80 characters, even in Markdown files and comments.
This ensures code is readable in split-screen views and on smaller screens
without horizontal scrolling.
Prefer:
Target 80 characters for wrapping text. Exceptions are allowed for long URLs
or identifiers that cannot be broken.
Discovery
Multi-line Strings
To find candidates for multi-line strings, search for string concatenation
with + involving newlines:
- Regex:
['"]\s*\+\s*['"]
- Regex:
\+\s*['"].*\\n
Line Length
- Rely on the
lines_longer_than_80_charslint from the analyzer.
Related Skills
- dart-modern-features: For idiomatic
usage of modern Dart features like Pattern Matching (useful for deep JSON
extraction), Records, and Switch Expressions.