import type { DuplicateContribution, Registration } from '../../api/index.js';
/** How many refused registrations `duplicates()` keeps (the most recent ones). */
export declare const MAX_REPORTED_DUPLICATES = 100;
/**
 * Keyed, ordered contributions with change notification. A second entry for a
 * key is refused and reported; the first registration stays.
 *
 * Registrations are not tied to a plugin's lifecycle: a contributor that can be
 * deactivated keeps its `dispose` handles. A route disposed and registered
 * again goes to the end of the list, so the list follows `dependsOn` order for
 * registrations made during `initialize()`.
 */
export declare class ContributionRegistry<T> {
    private readonly keyOf;
    private readonly onChange;
    private readonly records;
    private readonly refused;
    private readonly listeners;
    private readonly onDuplicate;
    constructor(keyOf: (entry: T) => string, kind: string, onDuplicate?: (duplicate: DuplicateContribution<T>) => void, onChange?: () => void);
    add(entry: T): Registration<T>;
    removeKey(key: string): boolean;
    list(): readonly T[];
    duplicates(): readonly DuplicateContribution<T>[];
    subscribe(listener: () => void): () => void;
    private removeRecord;
    private notify;
}
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