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This package serves three purposes:

  • It documents how Dart static analysis is used internally at Google, including best practices for the code we write. The documentation is this README.md.
  • It contains a corresponding sample analysis_options.yaml.
  • It contains occasional small snippets of Dart code that are used in implementing those best practices.

Note that everything here fits within the guidelines set out in Effective Dart. You could think of that document as the design and this package as one possible partial implementation.

See this Medium article for more background.

Using Static Analysis

Here is how static analysis is used internally at Google:

  • By default we disallow checking in code with any errors, warnings, or hints.
    • The TODO hint is a permanent exception.
    • Deprecation hints are a permanent exception. Deprecations are handled separately on a case by case basis.
    • unnecessary_no_such_method, unused_element, unused_field and unused_local_variable are allowed.
    • When a new SDK version adds new errors, warnings or hints, we either clean up everything before switching SDK version or maintain a whitelist of allowed violations so it can be gradually cleaned up.
  • Lints are considered and enabled on a case by case basis. When enabling a lint we first clean up all pre-existing violations. After it's enabled, any attempt to check in a further violation will be blocked.

Enabled Lints

The currently enabled lints can be found in analysis_options.1.8.0.yaml.

Using the Lints

To use the lints add a dependency in your pubspec.yaml:

# If you use `package:pedantic/pedantic.dart`, add a normal dependency.
  pedantic: ^1.8.0

# Or, if you just want `analysis_options.yaml`, it can be a dev dependency.
  pedantic: ^1.8.0

then, add an include in your analysis_options.yaml. If you want to always use the latest version of the lints, add a dependency on the main analysis_options file:

include: package:pedantic/analysis_options.yaml

If your continuous build and/or presubmit check lints then they will likely fail whenever a new version of package:pedantic is released. To avoid this, specify a specific version of analysis_options.yaml instead:

include: package:pedantic/analysis_options.1.8.0.yaml

Unused Lints

The following lints have been considered and will not be enforced:

always_put_control_body_on_new_line violates Effective Dart “DO format your code using dartfmt”. See note about Flutter SDK style below.

always_specify_types violates Effective Dart “AVOID type annotating initialized local variables” and others. See note about Flutter SDK style below.

avoid_as does not reflect standard usage. See note about Flutter SDK style below.

control_flow_in_finally does not offer enough value: people are unlikely to do this by accident, and there are occasional valid uses.

empty_statements is superfluous, enforcing use of dartfmt is sufficient to make empty statements obvious.

prefer_bool_in_asserts is obsolete in Dart 2; bool is required in asserts.

prefer_final_locals does not reflect standard usage.

throw_in_finally does not offer enough value: people are unlikely to do this by accident, and there are occasional valid uses.

Note on Flutter SDK Style: some lints were created specifically to support Flutter SDK development. Flutter app developers should instead use standard Dart style as described in Effective Dart, and should not use these lints.

Features and bugs

Please file feature requests and bugs at the issue tracker.