export type ResourceLease<T> = {
    value: T;
    release: () => void;
    retain: () => ResourceLease<T>;
};
/** Keys are immutable source objects: a refreshed source is a new revision. */
export declare class ResourceCache<T extends {
    dispose(): void;
}> {
    private entries;
    acquire(source: object, variant: string, create: () => T): ResourceLease<T>;
    get size(): number;
}
//# sourceMappingURL=resource-cache.d.ts.map