17987503568

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/src/Client.ts

import {
    absolute,
    debug as _debug,
    getPath,
    jwtDecode,
    makeArray,
    request,
    byCode,
    byCodes,
    units,
    getPatientParam,
    fetchConformanceStatement,
    getAccessTokenExpiration,
    assert
} from "./lib";

import str from "./strings";
import { SMART_KEY, patientCompartment } from "./settings";
import HttpError from "./HttpError";
import BrowserAdapter from "./adapters/BrowserAdapter";
import { fhirclient } from "./types";
import FhirClient from "./FhirClient";


const debug = _debug.extend("client");

/**
 * Adds patient context to requestOptions object to be used with [[Client.request]]
 * @param requestOptions Can be a string URL (relative to the serviceUrl), or an
 * object which will be passed to fetch()
 * @param client Current FHIR client object containing patient context
 * @return requestOptions object contextualized to current patient
 */
async function contextualize(
    requestOptions: string | URL | fhirclient.RequestOptions,
    client: Client
): Promise<fhirclient.RequestOptions>
{
    const base = absolute("/", client.state.serverUrl);

    async function contextualURL(_url: URL) {
        const resourceType = _url.pathname.split("/").pop();
        assert(resourceType, `Invalid url "${_url}"`);
        assert(patientCompartment.indexOf(resourceType) > -1, `Cannot filter "${resourceType}" resources by patient`);
        const conformance = await fetchConformanceStatement(client.state.serverUrl);
        const searchParam = getPatientParam(conformance, resourceType);
        _url.searchParams.set(searchParam, client.patient.id as string);
        return _url.href;
    }

    if (typeof requestOptions == "string" || requestOptions instanceof URL) {
        return { url: await contextualURL(new URL(requestOptions + "", base)) };
    }

    requestOptions.url = await contextualURL(new URL(requestOptions.url + "", base));
    return requestOptions;
}

/**
 * This is a FHIR client that is returned to you from the `ready()` call of the
 * **SMART API**. You can also create it yourself if needed:
 *
 * ```js
 * // BROWSER
 * const client = FHIR.client("https://r4.smarthealthit.org");
 *
 * // SERVER
 * const client = smart(req, res).client("https://r4.smarthealthit.org");
 * ```
 */
export default class Client extends FhirClient
{
    /**
     * The state of the client instance is an object with various properties.
     * It contains some details about how the client has been authorized and
     * determines the behavior of the client instance. This state is persisted
     * in `SessionStorage` in browsers or in request session on the servers.
     */
    readonly state: fhirclient.ClientState;

    /**
     * The adapter to use to connect to the current environment. Currently we have:
     * - BrowserAdapter - for browsers
     * - NodeAdapter - for Express or vanilla NodeJS servers
     * - HapiAdapter - for HAPI NodeJS servers
     */
    readonly environment: fhirclient.Adapter;

    /**
     * A SMART app is typically associated with a patient. This is a namespace
     * for the patient-related functionality of the client.
     */
    readonly patient: {

        /**
         * The ID of the current patient or `null` if there is no current patient
         */
        id: string | null

        /**
         * A method to fetch the current patient resource from the FHIR server.
         * If there is no patient context, it will reject with an error.
         * @param {fhirclient.FetchOptions} [requestOptions] Any options to pass to the `fetch` call.
         * @category Request
         */
        read: fhirclient.RequestFunction<fhirclient.FHIR.Patient>
        
        /**
         * This is similar to [[request]] but it makes requests in the
         * context of the current patient. For example, instead of doing
         * ```js
         * client.request("Observation?patient=" + client.patient.id)
         * ```
         * you can do
         * ```js
         * client.patient.request("Observation")
         * ```
         * The return type depends on the arguments. Typically it will be the
         * response payload JSON object. Can also be a string or the `Response`
         * object itself if we have received a non-json result, which allows us
         * to handle even binary responses. Can also be a [[CombinedFetchResult]]
         * object if the `requestOptions.includeResponse`s has been set to true.
         * @category Request
         */
        request: <R = fhirclient.FetchResult>(
            requestOptions: string|URL|fhirclient.RequestOptions,
            fhirOptions?: fhirclient.FhirOptions
        ) => Promise<R>

        /**
         * This is the FhirJS Patient API. It will ONLY exist if the `Client`
         * instance is "connected" to FhirJS.
         */
        api?: Record<string, any>
    };

    /**
     * The client may be associated with a specific encounter, if the scopes
     * permit that and if the back-end server supports that. This is a namespace
     * for encounter-related functionality.
     */
    readonly encounter: {

        /**
         * The ID of the current encounter or `null` if there is no current
         * encounter
         */
        id: string | null

        /**
         * A method to fetch the current encounter resource from the FHIR server.
         * If there is no encounter context, it will reject with an error.
         * @param [requestOptions] Any options to pass to the `fetch` call.
         * @category Request
         */
        read: fhirclient.RequestFunction<fhirclient.FHIR.Encounter>
    };

    /**
     * The client may be associated with a specific user, if the scopes
     * permit that. This is a namespace for user-related functionality.
     */
    readonly user: {

        /**
         * The ID of the current user or `null` if there is no current user
         */
        id: string | null

        /**
         * A method to fetch the current user resource from the FHIR server.
         * If there is no user context, it will reject with an error.
         * @param [requestOptions] Any options to pass to the `fetch` call.
         * @category Request
         */
        read: fhirclient.RequestFunction<
            fhirclient.FHIR.Patient |
            fhirclient.FHIR.Practitioner |
            fhirclient.FHIR.RelatedPerson
        >

        /**
         * Returns the profile of the logged_in user (if any), or null if the
         * user is not available. This is a string having the shape
         * `{user type}/{user id}`. For example `Practitioner/abc` or
         * `Patient/xyz`.
         * @see client.getFhirUser()
         */
        fhirUser: string | null

        /**
         * Returns the type of the logged-in user or null. The result can be
         * `Practitioner`, `Patient` or `RelatedPerson`.
         * @see client.getUserType()
         */
        resourceType: string | null
    };

    /**
     * The [FhirJS](https://github.com/FHIR/fhir.js/blob/master/README.md) API.
     * **NOTE:** This will only be available if `fhir.js` is used. Otherwise it
     * will be `undefined`.
     */
    api: Record<string, any> | undefined;

    /**
     * Refers to the refresh task while it is being performed.
     * @see [[refresh]]
     */
    private _refreshTask: Promise<any> | null;

    /**
     * Validates the parameters and creates an instance.
     */
    constructor(environment: fhirclient.Adapter, state: fhirclient.ClientState | string)
    {
        const _state = typeof state == "string" ? { serverUrl: state } : state;
        
        // Valid serverUrl is required!
        assert(
            _state.serverUrl && _state.serverUrl.match(/https?:\/\/.+/),
            "A \"serverUrl\" option is required and must begin with \"http(s)\""
        );
        
        super(_state.serverUrl)

        this.state = _state;
        this.environment = environment;
        this._refreshTask = null;

        const client = this;

        // patient api ---------------------------------------------------------
        this.patient = {
            get id() { return client.getPatientId(); },
            read: (requestOptions) => {
                const id = this.patient.id;
                return id ?
                    this.request({ ...requestOptions, url: `Patient/${id}` }) :
                    Promise.reject(new Error("Patient is not available"));
            },
            request: (requestOptions, fhirOptions = {}) => {
                if (this.patient.id) {
                    return (async () => {
                        const options = await contextualize(requestOptions, this);
                        return this.request(options, fhirOptions);
                    })();
                } else {
                    return Promise.reject(new Error("Patient is not available"));
                }
            }
        };

        // encounter api -------------------------------------------------------
        this.encounter = {
            get id() { return client.getEncounterId(); },
            read: requestOptions => {
                const id = this.encounter.id;
                return id ?
                    this.request({ ...requestOptions, url: `Encounter/${id}` }) :
                    Promise.reject(new Error("Encounter is not available"));
            }
        };

        // user api ------------------------------------------------------------
        this.user = {
            get fhirUser() { return client.getFhirUser(); },
            get id() { return client.getUserId(); },
            get resourceType() { return client.getUserType(); },
            read: requestOptions => {
                const fhirUser = this.user.fhirUser;
                return fhirUser ?
                    this.request({ ...requestOptions, url: fhirUser }) :
                    Promise.reject(new Error("User is not available"));
            }
        };
    }

    /**
     * Returns the ID of the selected patient or null. You should have requested
     * "launch/patient" scope. Otherwise this will return null.
     */
    getPatientId(): string | null
    {
        const tokenResponse = this.state.tokenResponse;
        if (tokenResponse) {
            // We have been authorized against this server but we don't know
            // the patient. This should be a scope issue.
            if (!tokenResponse.patient) {
                if (!(this.state.scope || "").match(/\blaunch(\/patient)?\b/)) {
                    debug(str.noScopeForId, "patient", "patient");
                }
                else {
                    // The server should have returned the patient!
                    debug("The ID of the selected patient is not available. Please check if your server supports that.");
                }
                return null;
            }
            return tokenResponse.patient;
        }

        if (this.state.authorizeUri) {
            debug(str.noIfNoAuth, "the ID of the selected patient");
        }
        else {
            debug(str.noFreeContext, "selected patient");
        }
        return null;
    }

    /**
     * Returns the ID of the selected encounter or null. You should have
     * requested "launch/encounter" scope. Otherwise this will return null.
     * Note that not all servers support the "launch/encounter" scope so this
     * will be null if they don't.
     */
    getEncounterId(): string | null
    {
        const tokenResponse = this.state.tokenResponse;
        if (tokenResponse) {
            // We have been authorized against this server but we don't know
            // the encounter. This should be a scope issue.
            if (!tokenResponse.encounter) {
                if (!(this.state.scope || "").match(/\blaunch(\/encounter)?\b/)) {
                    debug(str.noScopeForId, "encounter", "encounter");
                }
                else {
                    // The server should have returned the encounter!
                    debug("The ID of the selected encounter is not available. Please check if your server supports that, and that the selected patient has any recorded encounters.");
                }
                return null;
            }
            return tokenResponse.encounter;
        }

        if (this.state.authorizeUri) {
            debug(str.noIfNoAuth, "the ID of the selected encounter");
        }
        else {
            debug(str.noFreeContext, "selected encounter");
        }
        return null;
    }

    /**
     * Returns the (decoded) id_token if any. You need to request "openid" and
     * "profile" scopes if you need to receive an id_token (if you need to know
     * who the logged-in user is).
     */
    getIdToken(): fhirclient.IDToken | null
    {
        const tokenResponse = this.state.tokenResponse;
        if (tokenResponse) {
            const idToken = tokenResponse.id_token;
            const scope = this.state.scope || "";

            // We have been authorized against this server but we don't have
            // the id_token. This should be a scope issue.
            if (!idToken) {
                const hasOpenid   = scope.match(/\bopenid\b/);
                const hasProfile  = scope.match(/\bprofile\b/);
                const hasFhirUser = scope.match(/\bfhirUser\b/);
                if (!hasOpenid || !(hasFhirUser || hasProfile)) {
                    debug(
                        "You are trying to get the id_token but you are not " +
                        "using the right scopes. Please add 'openid' and " +
                        "'fhirUser' or 'profile' to the scopes you are " +
                        "requesting."
                    );
                }
                else {
                    // The server should have returned the id_token!
                    debug("The id_token is not available. Please check if your server supports that.");
                }
                return null;
            }
            return jwtDecode(idToken, this.environment) as fhirclient.IDToken;
        }
        if (this.state.authorizeUri) {
            debug(str.noIfNoAuth, "the id_token");
        }
        else {
            debug(str.noFreeContext, "id_token");
        }
        return null;
    }

    /**
     * Returns the profile of the logged_in user (if any). This is a string
     * having the following shape `"{user type}/{user id}"`. For example:
     * `"Practitioner/abc"` or `"Patient/xyz"`.
     */
    getFhirUser(): string | null
    {
        const idToken = this.getIdToken();
        if (idToken) {
            // Epic may return a full url
            // @see https://github.com/smart-on-fhir/client-js/issues/105
            if (idToken.fhirUser) {
                return idToken.fhirUser.split("/").slice(-2).join("/");
            }
            return idToken.profile
        }
        return null;
    }

    /**
     * Returns the user ID or null.
     */
    getUserId(): string | null
    {
        const profile = this.getFhirUser();
        if (profile) {
            return profile.split("/")[1];
        }
        return null;
    }

    /**
     * Returns the type of the logged-in user or null. The result can be
     * "Practitioner", "Patient" or "RelatedPerson".
     */
    getUserType(): string | null
    {
        const profile = this.getFhirUser();
        if (profile) {
            return profile.split("/")[0];
        }
        return null;
    }

    /**
     * Builds and returns the value of the `Authorization` header that can be
     * sent to the FHIR server
     */
    getAuthorizationHeader(): string | null
    {
        const accessToken = this.getState("tokenResponse.access_token");
        if (accessToken) {
            return "Bearer " + accessToken;
        }
        const { username, password } = this.state;
        if (username && password) {
            return "Basic " + this.environment.btoa(username + ":" + password);
        }
        return null;
    }

    /**
     * Used internally to clear the state of the instance and the state in the
     * associated storage.
     */
    private async _clearState() {
        const storage = this.environment.getStorage();
        const key = await storage.get(SMART_KEY);
        if (key) {
            await storage.unset(key);
        }
        await storage.unset(SMART_KEY);
        this.state.tokenResponse = {};
    }

    /**
     * @param requestOptions Can be a string URL (relative to the serviceUrl),
     * or an object which will be passed to fetch()
     * @param fhirOptions Additional options to control the behavior
     * @param _resolvedRefs DO NOT USE! Used internally.
     * @category Request
     */
    async request<T = any>(
        requestOptions: string|URL|fhirclient.RequestOptions,
        fhirOptions: fhirclient.FhirOptions = {},
        _resolvedRefs: fhirclient.JsonObject = {}
    ): Promise<T>
    {
        const debugRequest = _debug.extend("client:request");
        assert(requestOptions, "request requires an url or request options as argument");

        // url -----------------------------------------------------------------
        let url: string;
        if (typeof requestOptions == "string" || requestOptions instanceof URL) {
            url = String(requestOptions);
            requestOptions = {} as fhirclient.RequestOptions;
        }
        else {
            url = String(requestOptions.url);
        }

        url = absolute(url, this.state.serverUrl);

        const options = {
            graph: fhirOptions.graph !== false,
            flat : !!fhirOptions.flat,
            pageLimit: fhirOptions.pageLimit ?? 1,
            resolveReferences: makeArray(fhirOptions.resolveReferences || []) as string[],
            useRefreshToken: fhirOptions.useRefreshToken !== false,
            onPage: typeof fhirOptions.onPage == "function" ?
                fhirOptions.onPage as (
                    data: fhirclient.JsonObject | fhirclient.JsonObject[],
                    references?: fhirclient.JsonObject | undefined) => any :
                undefined
        };

        const signal = (requestOptions as RequestInit).signal || undefined;

        // Refresh the access token if needed
        if (options.useRefreshToken) {
            await this.refreshIfNeeded({ signal })
        }

        // Add the Authorization header now, after the access token might
        // have been updated
        const authHeader = this.getAuthorizationHeader();
        if (authHeader) {
            requestOptions.headers = {
                ...requestOptions.headers,
                authorization: authHeader
            };
        }

        debugRequest("%s, options: %O, fhirOptions: %O", url, requestOptions, options);

        let response: Response | undefined;

        return super.fhirRequest<fhirclient.FetchResult>(url, requestOptions).then(result => {
            if ((requestOptions as fhirclient.RequestOptions).includeResponse) {
                response = (result as fhirclient.CombinedFetchResult).response;
                return (result as fhirclient.CombinedFetchResult).body;
            }
            return result;
        })

        // Handle 401 ----------------------------------------------------------
        .catch(async (error: HttpError) => {
            if (error.status == 401) {

                // !accessToken -> not authorized -> No session. Need to launch.
                if (!this.getState("tokenResponse.access_token")) {
                    error.message += "\nThis app cannot be accessed directly. Please launch it as SMART app!";
                    throw error;
                }

                // auto-refresh not enabled and Session expired.
                // Need to re-launch. Clear state to start over!
                if (!options.useRefreshToken) {
                    debugRequest("Your session has expired and the useRefreshToken option is set to false. Please re-launch the app.");
                    await this._clearState();
                    error.message += "\n" + str.expired;
                    throw error;
                }

                // In rare cases we may have a valid access token and a refresh
                // token and the request might still fail with 401 just because
                // the access token has just been revoked.

                // otherwise -> auto-refresh failed. Session expired.
                // Need to re-launch. Clear state to start over!
                debugRequest("Auto-refresh failed! Please re-launch the app.");
                await this._clearState();
                error.message += "\n" + str.expired;
                throw error;
            }
            throw error;
        })

        // Handle 403 ----------------------------------------------------------
        .catch((error: HttpError) => {
            if (error.status == 403) {
                debugRequest("Permission denied! Please make sure that you have requested the proper scopes.");
            }
            throw error;
        })

        .then(async (data: any) => {

            // At this point we don't know what `data` actually is!
            // We might get an empty or falsy result. If so return it as is
            // Also handle raw responses
            if (!data || typeof data == "string" || data instanceof Response) {
                if ((requestOptions as fhirclient.FetchOptions).includeResponse) {
                    return {
                        body: data,
                        response
                    }
                }
                return data;
            }
            
            // Resolve References ----------------------------------------------
            await this.fetchReferences(
                data as any,
                options.resolveReferences,
                options.graph,
                _resolvedRefs,
                requestOptions as fhirclient.RequestOptions
            );

            return Promise.resolve(data)

            // Pagination ------------------------------------------------------
            .then(async _data => {
                if (_data && _data.resourceType == "Bundle") {
                    const links = (_data.link || []) as fhirclient.FHIR.BundleLink[];

                    if (options.flat) {
                        _data = (_data.entry || []).map(
                            (entry: fhirclient.FHIR.BundleEntry) => entry.resource
                        );
                    }

                    if (options.onPage) {
                        await options.onPage(_data, { ..._resolvedRefs });
                    }

                    if (--options.pageLimit) {
                        const next = links.find(l => l.relation == "next");
                        _data = makeArray(_data);
                        if (next && next.url) {
                            const nextPage = await this.request(
                                {
                                    url: next.url,

                                    // Aborting the main request (even after it is complete)
                                    // must propagate to any child requests and abort them!
                                    // To do so, just pass the same AbortSignal if one is
                                    // provided.
                                    signal
                                },
                                options,
                                _resolvedRefs
                            );

                            if (options.onPage) {
                                return null;
                            }

                            if (options.resolveReferences.length) {
                                Object.assign(_resolvedRefs, nextPage.references);
                                return _data.concat(makeArray(nextPage.data || nextPage));
                            }
                            return _data.concat(makeArray(nextPage));
                        }
                    }
                }
                return _data;
            })

            // Finalize --------------------------------------------------------
            .then(_data => {
                if (options.graph) {
                    _resolvedRefs = {};
                }
                else if (!options.onPage && options.resolveReferences.length) {
                    return {
                        data: _data,
                        references: _resolvedRefs
                    };
                }
                return _data;
            })
            .then(_data => {
                if ((requestOptions as fhirclient.FetchOptions).includeResponse) {
                    return {
                        body: _data,
                        response
                    }
                }
                return _data;
            });
        });
    }

    /**
     * Checks if access token and refresh token are present. If they are, and if
     * the access token is expired or is about to expire in the next 10 seconds,
     * calls `this.refresh()` to obtain new access token.
     * @param requestOptions Any options to pass to the fetch call. Most of them
     * will be overridden, bit it might still be useful for passing additional
     * request options or an abort signal.
     * @category Request
     */
    refreshIfNeeded(requestOptions: RequestInit = {}): Promise<fhirclient.ClientState>
    {
        const accessToken  = this.getState("tokenResponse.access_token");
        const refreshToken = this.getState("tokenResponse.refresh_token");
        const expiresAt    = this.state.expiresAt || 0;

        if (accessToken && refreshToken && expiresAt - 10 < Date.now() / 1000) {
            return this.refresh(requestOptions);
        }

        return Promise.resolve(this.state);
    }

    /**
     * Use the refresh token to obtain new access token. If the refresh token is
     * expired (or this fails for any other reason) it will be deleted from the
     * state, so that we don't enter into loops trying to re-authorize.
     *
     * This method is typically called internally from [[request]] if
     * certain request fails with 401.
     *
     * @param requestOptions Any options to pass to the fetch call. Most of them
     * will be overridden, bit it might still be useful for passing additional
     * request options or an abort signal.
     * @category Request
     */
    refresh(requestOptions: RequestInit = {}): Promise<fhirclient.ClientState>
    {
        const debugRefresh = _debug.extend("client:refresh");
        debugRefresh("Attempting to refresh with refresh_token...");

        const refreshToken = this.state?.tokenResponse?.refresh_token;
        assert(refreshToken, "Unable to refresh. No refresh_token found.");

        const tokenUri = this.state.tokenUri;
        assert(tokenUri, "Unable to refresh. No tokenUri found.");

        const scopes = this.getState("tokenResponse.scope") || "";
        const hasOfflineAccess = scopes.search(/\boffline_access\b/) > -1;
        const hasOnlineAccess = scopes.search(/\bonline_access\b/) > -1;
        assert(hasOfflineAccess || hasOnlineAccess, "Unable to refresh. No offline_access or online_access scope found.");

        // This method is typically called internally from `request` if certain
        // request fails with 401. However, clients will often run multiple
        // requests in parallel which may result in multiple refresh calls.
        // To avoid that, we keep a reference to the current refresh task (if any).
        if (!this._refreshTask) {
            let body = `grant_type=refresh_token&refresh_token=${encodeURIComponent(refreshToken)}`;
            if (this.environment.options.refreshTokenWithClientId) {
                body += `&client_id=${this.state.clientId}`;
            }
            const refreshRequestOptions = {
                credentials: this.environment.options.refreshTokenWithCredentials || "same-origin",
                ...requestOptions,
                method : "POST",
                mode   : "cors" as RequestMode,
                headers: {
                    ...(requestOptions.headers || {}),
                    "content-type": "application/x-www-form-urlencoded"
                },
                body: body
            };

            // custom authorization header can be passed on manual calls
            if (!("authorization" in refreshRequestOptions.headers)) {
                const { clientSecret, clientId } = this.state;
                if (clientSecret) {
                    // @ts-ignore
                    refreshRequestOptions.headers.authorization = "Basic " + this.environment.btoa(
                        clientId + ":" + clientSecret
                    );
                }
            }

            this._refreshTask = request<fhirclient.TokenResponse>(tokenUri, refreshRequestOptions)
            .then(data => {
                assert(data.access_token, "No access token received");
                debugRefresh("Received new access token response %O", data);
                this.state.tokenResponse = { ...this.state.tokenResponse, ...data };
                this.state.expiresAt = getAccessTokenExpiration(data, this.environment);
                return this.state;
            })
            .catch((error: Error) => {
                if (this.state?.tokenResponse?.refresh_token) {
                    debugRefresh("Deleting the expired or invalid refresh token.");
                    delete this.state.tokenResponse.refresh_token;
                }
                throw error;
            })
            .finally(() => {
                this._refreshTask = null;
                const key = this.state.key;
                if (key) {
                    this.environment.getStorage().set(key, this.state);
                } else {
                    debugRefresh("No 'key' found in Clint.state. Cannot persist the instance.");
                }
            });
        }

        return this._refreshTask;
    }

    // utils -------------------------------------------------------------------

    /**
     * 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
     * @remarks This should be deprecated and moved elsewhere. One should not have
     * to obtain an instance of [[Client]] just to use utility functions like this.
     * @deprecated
     * @category Utility
     */
    byCode(
        observations: fhirclient.FHIR.Observation | fhirclient.FHIR.Observation[],
        property: string
    ): fhirclient.ObservationMap
    {
        return byCode(observations, property);
    }

    /**
     * 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
     * @remarks This should be deprecated and moved elsewhere. One should not have
     * to obtain an instance of [[Client]] just to use utility functions like this.
     * @deprecated
     * @category Utility
     */
    byCodes(
        observations: fhirclient.FHIR.Observation | fhirclient.FHIR.Observation[],
        property: string
    ): (...codes: string[]) => any[]
    {
        return byCodes(observations, property);
    }

    /**
     * @category Utility
     */
    units = units;

    /**
     * Walks through an object (or array) and returns the value found at the
     * provided path. This function is very simple so it intentionally does not
     * support any argument polymorphism, meaning that the path can only be a
     * dot-separated string. If the path is invalid returns undefined.
     * @param obj The object (or Array) to walk through
     * @param path The path (eg. "a.b.4.c")
     * @returns {*} Whatever is found in the path or undefined
     * @remarks This should be deprecated and moved elsewhere. One should not have
     * to obtain an instance of [[Client]] just to use utility functions like this.
     * @deprecated
     * @category Utility
     */
    getPath(obj: Record<string, any>, path = ""): any {
        return getPath(obj, path);
    }

    /**
     * Returns a copy of the client state. Accepts a dot-separated path argument
     * (same as for `getPath`) to allow for selecting specific properties.
     * Examples:
     * ```js
     * client.getState(); // -> the entire state object
     * client.getState("serverUrl"); // -> the URL we are connected to
     * client.getState("tokenResponse.patient"); // -> The selected patient ID (if any)
     * ```
     * @param path The path (eg. "a.b.4.c")
     * @returns {*} Whatever is found in the path or undefined
     */
    getState(path = "") {
        return getPath({ ...this.state }, path);
    }

}

smart-on-fhir / client-js / 17987503568

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