runWithReporter method

@override void runWithReporter(SaropaDiagnosticReporter reporter, SaropaContext context)

Override this method to implement your lint rule.

Use context to register callbacks for AST node types:

context.addMethodInvocation((node) {
  if (condition) {
    reporter.atNode(node);
  }
});

Implementation

@override
void runWithReporter(
  SaropaDiagnosticReporter reporter,
  SaropaContext context,
) {
  context.addInstanceCreationExpression((InstanceCreationExpression node) {
    final String typeName = node.constructorName.type.name.lexeme;
    if (typeName != 'CachedNetworkImage') return;

    bool hasErrorFallback = false;

    for (final arg in node.argumentList.arguments) {
      if (arg is! NamedExpression) continue;

      final String argumentName = arg.name.label.name;
      if (argumentName == 'errorWidget' || argumentName == 'errorBuilder') {
        hasErrorFallback = true;
        break;
      }
    }

    if (!hasErrorFallback) {
      reporter.atNode(node);
    }
  });
}