/**
 * A class manage a de-duplicated set of class IDs that errors if you try to add a duplicate.
 * Useful for bytecode retrieval hints to avoid duplicates in parent trace & grandparent trace....
 */
export declare class UniqueClassIds {
    private readonly parent?;
    private readonly classIds;
    constructor(parent?: UniqueClassIds | undefined);
    /**
     * Create a fork that references this one as its parent
     */
    fork(): UniqueClassIds;
    /**
     * Check for a class ID here or in parent's (recursively).
     *
     * @param classId - the contract class ID (as a string) to check
     * @returns boolean: whether the class ID is here
     */
    has(classId: string): boolean;
    /**
     * Get the total number of classIds
     */
    size(): number;
    /**
     * Add a class ID (if not already present) to the set.
     *
     * @param classId - the contract class ID (as a string)
     */
    add(classId: string): void;
    /**
     * Merge in another set of unique class IDs into this one, but fail on duplicates.
     *
     * @param incoming: other unique class IDs
     */
    acceptAndMerge(incoming: UniqueClassIds): void;
}
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