builder.log('Got here.');

// Got here.

final map = await builder.introspectFields(clazz);
final type = map['fieldName']!.typeDeclaration;

builder.declareInLibrary(
  DeclarationCode.fromParts([
    'augment class Foo {\n',
    ..._getMyMethodParts().indent(), // Adds 2 spaces before each line of the code.
    '}\n',
  ]),
);

builder.reportError('Error message', target: target);

builder.report(
  Diagnostic(
    DiagnosticMessage('Error message', target: target),
    Severity.error,
  ),
);