import 'reflect-metadata';
/** Metadata stored by the variantOf class decorator. */
export interface VariantOfMetadata {
    /** The type anchoring the logical identity every variant of this group shares. */
    readonly identity: Function;
    /** The property name on this variant used as its own key, and as the correlation property for reclassified joins. */
    readonly key: string;
}
/**
 * Class decorator that declares a read model to be one of several mutually exclusive
 * representations of the same logical entity. Entering one variant removes the entity
 * from every sibling variant of the same identity.
 * @param identity - The type anchoring the logical identity shared by every variant. Does not need to be a read model itself.
 * @param key - The property name on this variant used as its own key.
 * @returns A class decorator.
 */
export declare function variantOf(identity: Function, key: string): ClassDecorator;
/**
 * Retrieves variantOf metadata stored on the given class constructor.
 * @param target - The class constructor.
 * @returns The variantOf metadata, or undefined if the class is not a variant.
 */
export declare function getVariantOfMetadata(target: Function): VariantOfMetadata | undefined;
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