/**
 * Given a token response, computes and returns the expiresAt timestamp.
 * Note that this should only be used immediately after an access token is
 * received, otherwise the computed timestamp will be incorrect.
 * @param tokenResponse
 * @param env
 */
/**
 * Groups the observations by code. Returns a map that will look like:
 * ```js
 * const map = client.byCodes(observations, "code");
 * // map = {
 * //     "55284-4": [ observation1, observation2 ],
 * //     "6082-2": [ observation3 ]
 * // }
 * ```
 * @param observations Array of observations
 * @param property The name of a CodeableConcept property to group by
 */
/**
 * First groups the observations by code using `byCode`. Then returns a function
 * that accepts codes as arguments and will return a flat array of observations
 * having that codes. Example:
 * ```js
 * const filter = client.byCodes(observations, "category");
 * filter("laboratory") // => [ observation1, observation2 ]
 * filter("vital-signs") // => [ observation3 ]
 * filter("laboratory", "vital-signs") // => [ observation1, observation2, observation3 ]
 * ```
 * @param observations Array of observations
 * @param property The name of a CodeableConcept property to group by
 */
/**
 * Given a conformance statement and a resource type, returns the name of the
 * URL parameter that can be used to scope the resource type by patient ID.
 */
/**
 * Resolves a reference to target window. It may also open new window or tab if
 * the `target = "popup"` or `target = "_blank"`.
 * @param target
 * @param width Only used when `target = "popup"`
 * @param height Only used when `target = "popup"`
 */
export declare function assert(condition: any, message: string): asserts condition;