type Result<T> = {
    value: T;
    error?: never;
} | {
    value?: never;
    error: Error;
};
export type Resource<K extends readonly unknown[], T> = {
    matches: (key: K) => boolean;
    promise: Promise<Result<T>>;
    retain: () => () => void;
};
export type Task<T> = {
    promise: Promise<T>;
    dispose?: () => void | Promise<void>;
};
type Options<K extends readonly unknown[]> = {
    areKeysEqual?: (first: K, second: K) => boolean;
    /** Keep successful data when the cache is scoped to its owning document. */
    cacheResolved?: boolean;
};
export default class ResourceCache<K extends readonly unknown[], T> {
    private options;
    private entries;
    constructor(options?: Options<K>);
    getOrCreate(key: K, load: () => Task<T>): Resource<K, T>;
}
export {};