import type { Constructor } from '@cratis/fundamentals';
/**
 * Resolves the compliance subject - the natural person a read model's Personal Identifiable
 * Information (PII) belongs to - from a read model instance.
 */
export declare class ReadModelSubjectResolver {
    /**
     * Attempts to derive the compliance subject from a read model instance.
     *
     * Resolution order:
     * 1. The property decorated with `@subject()` on {@link readModelType}, when it has a value.
     * 2. The `id` property, by convention - kept so read models that predate `@subject()`
     *    continue to resolve exactly as before.
     * @param readModelType - The read model type to resolve subject metadata for.
     * @param instance - The read model instance to inspect, or undefined/null for a read model
     * that does not exist.
     * @returns The resolved subject, or undefined when neither source yields a value.
     */
    static resolveFrom<TReadModel>(readModelType: Constructor<TReadModel>, instance: TReadModel): string | undefined;
    private static toSubject;
}
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