requiredPatterns property

String patterns that must be present in the file for this rule to run.

Override to specify patterns for fast string-based early exit BEFORE AST parsing. If the file content doesn't contain ANY of these patterns, the rule is skipped entirely.

Example: A rule checking Timer.periodic usage:

@override
Set<String>? get requiredPatterns => {'Timer.periodic'};

Example: A rule checking various database calls:

@override
Set<String>? get requiredPatterns => {'rawQuery', 'rawInsert', 'execute'};

This is faster than AST traversal since it's a simple string search. Return null to skip this optimization (default).