export interface HasCache {
    /**
     * Use to cache arbitrary content associated with this instance.
     * Use for smallish objects that are expensive to compute.
     */
    readonly cache: Record<string, object>;
}
/**
 * Retrieve the value if stored in the cache. Otherwise compute with the given function
 * and store
 */
export declare function retrieveOrCompute<T extends HasCache, R extends object>(t: T, key: string, how: (t: T) => R, cache?: boolean): Promise<R>;
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