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General best practices for Dart development. Covers code style, effective Dart, and language features.
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| name | dart-best-practices |
| description | General best practices for Dart development. Covers code style, effective Dart, and language features. |
| license | Apache-2.0 |
| key_features | ["Code style guidelines","Effective Dart idioms","Language feature recommendations"] |
Use this skill when:
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-----''';
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.
To find candidates for multi-line strings, search for string concatenation
with + involving newlines:
['"]\s*\+\s*['"]\+\s*['"].*\\nlines_longer_than_80_chars lint from the analyzer.Profile Dart command-line applications using the VM Service protocol to capture CPU samples and identify performance bottlenecks. Helps agents automate CPU profiling, generate function call breakdown summaries, and export JSON profiles without a browser or DevTools.
Best practices for validating Dart documentation comments. Covers using `dart doc` to catch unresolved references and macros.
Guidelines for handling long lines in Dart code to adhere to the 80-column rule. The `lines_longer_than_80_chars` lint.
Best practices for using `expect` and `package:matcher`. Focuses on readable assertions, proper matcher selection, and avoiding common pitfalls.
Guidelines for using modern Dart features (v3.0 - v3.10) such as Records, Pattern Matching, Switch Expressions, Extension Types, Class Modifiers, Wildcards, Null-Aware Elements, and Dot Shorthands.
Guidelines and best practices for refactoring consecutive prints, single-line string concatenations, and complex output blocks into triple-quoted multi-line string literals (''' or """) in Dart.