Function createOrGetExistingAsync

createOrGetExistingAsync<
    TFields extends object,
    TIDField extends string | number | symbol,
    TViewerContext extends ViewerContext,
    TEntity extends
        ReadonlyEntity<TFields, TIDField, TViewerContext, TSelectedFields>,
    TPrivacyPolicy extends
        EntityPrivacyPolicy<
            TFields,
            TIDField,
            TViewerContext,
            TEntity,
            TSelectedFields,
        >,
    TGetArgs,
    TCreateArgs,
    TSelectedFields extends string | number | symbol = keyof TFields,
>(
    viewerContext: TViewerContext,
    entityClass: IEntityClass<
        TFields,
        TIDField,
        TViewerContext,
        TEntity,
        TPrivacyPolicy,
        TSelectedFields,
    >,
    getAsync: (
        viewerContext: TViewerContext,
        getArgs: TGetArgs,
        queryContext?: EntityTransactionalQueryContext,
    ) => Promise<TEntity | null>,
    getArgs: TGetArgs,
    createAsync: (
        viewerContext: TViewerContext,
        createArgs: TCreateArgs,
        queryContext?: EntityTransactionalQueryContext,
    ) => Promise<TEntity>,
    createArgs: TCreateArgs,
    queryContext?: EntityTransactionalQueryContext,
): Promise<TEntity>